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Development Essentials
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data-tracking-extra="{"title":"Optimistic Concurrency"}" href="/docs/build-basics/common-api-patterns/optimistic-concurrency" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_medium-20__UlBGy left-nav-items_link__skoFI left-nav-items_sub-level__bbmd6 focus-ring-styles_focus-ring__5P6v0"><span class="left-nav-items_depth-space__b597h"></span>Optimistic Concurrency</a></div><div class="recursive-nav-item_nav-item-wrap__7yT4s"><a data-tracking-id="left-nav-link" data-tracking-extra="{"title":"Clear Object Fields"}" href="/docs/build-basics/clearing-fields" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_medium-20__UlBGy left-nav-items_link__skoFI left-nav-items_sub-level__bbmd6 focus-ring-styles_focus-ring__5P6v0"><span class="left-nav-items_depth-space__b597h"></span>Clear Object Fields</a></div></div></div><div class="recursive-nav-item_nav-item-wrap__7yT4s"><a data-tracking-id="left-nav-link" data-tracking-extra="{"title":"Square eCommerce APIs"}" href="/docs/ecommerce-api" 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xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" clip-rule="evenodd" d="m4 4.586 4 4 4-4L13.414 6 8 11.414 2.586 6 4 4.586Z" fill="#7B61FF"></path></svg></button></div><div id=":Rv9l6:" inert="true" role="region" class="recursive-nav-item_items-container__BBrAQ"><div class="recursive-nav-item_content__WNo9i"><div class="recursive-nav-item_nav-item-wrap__7yT4s"><a data-tracking-id="left-nav-link" data-tracking-extra="{"title":"Deprecated Items"}" href="/docs/migrate-from-v1/current-status" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_medium-20__UlBGy left-nav-items_link__skoFI left-nav-items_sub-level__bbmd6 focus-ring-styles_focus-ring__5P6v0">Deprecated Items</a></div><div aria-expanded="false" aria-controls=":R1av9l6:" class="recursive-nav-item_nav-item-wrap__7yT4s recursive-nav-item_inner-sub-cat__ngiQT"><div class="text_base__bZ6a4 text_paragraph-20__2lYBq text_medium-20__UlBGy left-nav-items_link__skoFI left-nav-items_sub-level__bbmd6 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left-nav-items_link__skoFI left-nav-items_sub-level__bbmd6 focus-ring-styles_focus-ring__5P6v0"><span class="left-nav-items_depth-space__b597h"></span>v1 Payments API</a></div><div class="recursive-nav-item_nav-item-wrap__7yT4s"><a data-tracking-id="left-nav-link" data-tracking-extra="{"title":"v1 Refunds API"}" href="/docs/migrate-from-v1/guides/v1-refunds" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_medium-20__UlBGy left-nav-items_link__skoFI left-nav-items_sub-level__bbmd6 focus-ring-styles_focus-ring__5P6v0"><span class="left-nav-items_depth-space__b597h"></span>v1 Refunds API</a></div><div class="recursive-nav-item_nav-item-wrap__7yT4s"><a data-tracking-id="left-nav-link" data-tracking-extra="{"title":"Square Transactions API"}" href="/docs/payments-api/migrate-from-transactions-api" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_medium-20__UlBGy left-nav-items_link__skoFI left-nav-items_sub-level__bbmd6 focus-ring-styles_focus-ring__5P6v0"><span class="left-nav-items_depth-space__b597h"></span>Square Transactions API</a></div><div class="recursive-nav-item_nav-item-wrap__7yT4s"><a data-tracking-id="left-nav-link" data-tracking-extra="{"title":"Migrate Employees to Team Members"}" href="/docs/labor-api/migrate-to-teams" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_medium-20__UlBGy left-nav-items_link__skoFI left-nav-items_sub-level__bbmd6 focus-ring-styles_focus-ring__5P6v0"><span class="left-nav-items_depth-space__b597h"></span>Migrate Employees to Team Members</a></div><div class="recursive-nav-item_nav-item-wrap__7yT4s"><a data-tracking-id="left-nav-link" data-tracking-extra="{"title":"Migrate from CreateCheckout to CreatePaymentLink"}" href="/docs/migrate-from-v1/guides/v1-checkout" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_medium-20__UlBGy left-nav-items_link__skoFI left-nav-items_sub-level__bbmd6 focus-ring-styles_focus-ring__5P6v0"><span class="left-nav-items_depth-space__b597h"></span>Migrate from CreateCheckout to CreatePaymentLink</a></div></div></div></div></div><div aria-expanded="false" aria-controls=":R119l6:" class="recursive-nav-item_nav-item-wrap__7yT4s recursive-nav-item_top-level__aAjx6"><a data-tracking-id="left-nav-link" data-tracking-extra="{"title":"International Development"}" href="/docs/international-development" class="text_base__bZ6a4 text_paragraph-30___agDz text_medium-30__U9kB2 left-nav-items_link__skoFI left-nav-items_top-level__zpAn3 focus-ring-styles_focus-ring__5P6v0">International Development</a><button data-testid="expand-nav-items" data-tracking-id="expand-nav-items" aria-label="Expand navigation items" class="box_b-r-6__eFn6m native-button_button__Iabj1 native-button_no-border__LHOho native-button_button-padding__xncbB focus-ring-styles_focus-ring__5P6v0 recursive-nav-item_expand-button__OaGCd"><svg width="16" height="16" fill="none" xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" clip-rule="evenodd" d="m4 4.586 4 4 4-4L13.414 6 8 11.414 2.586 6 4 4.586Z" fill="#7B61FF"></path></svg></button></div><div id=":R119l6:" inert="true" role="region" class="recursive-nav-item_items-container__BBrAQ"><div class="recursive-nav-item_content__WNo9i"><div class="recursive-nav-item_nav-item-wrap__7yT4s"><a data-tracking-id="left-nav-link" data-tracking-extra="{"title":"OAuth and Testing"}" href="/docs/international-development/oauth-testing" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_medium-20__UlBGy left-nav-items_link__skoFI left-nav-items_sub-level__bbmd6 focus-ring-styles_focus-ring__5P6v0">OAuth and Testing</a></div><div class="recursive-nav-item_nav-item-wrap__7yT4s"><a data-tracking-id="left-nav-link" data-tracking-extra="{"title":"International Payments"}" href="/docs/international-development/payments" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_medium-20__UlBGy left-nav-items_link__skoFI left-nav-items_sub-level__bbmd6 focus-ring-styles_focus-ring__5P6v0">International Payments</a></div><div class="recursive-nav-item_nav-item-wrap__7yT4s"><a data-tracking-id="left-nav-link" data-tracking-extra="{"title":"Regional Differences for International Development"}" href="/docs/international-development/regional-differences" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_medium-20__UlBGy left-nav-items_link__skoFI left-nav-items_sub-level__bbmd6 focus-ring-styles_focus-ring__5P6v0">Regional Differences for International Development</a></div><div class="recursive-nav-item_nav-item-wrap__7yT4s"><a data-tracking-id="left-nav-link" data-tracking-extra="{"title":"Compliance with Japan's Tax Invoice System"}" href="/docs/international-development/japan-invoice-system" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_medium-20__UlBGy left-nav-items_link__skoFI left-nav-items_sub-level__bbmd6 focus-ring-styles_focus-ring__5P6v0">Compliance with Japan's Tax Invoice System</a></div></div></div></div></div><div class="grid_dex-grid-container__ZLJnB grid_dex-docs-app-grid-container__k80cL page-layout_page-layout__M2lNk page-layout_static-layout__CfHWZ"><div class="grid-item_grid-item-small__Xb5VI page-layout_left-nav__gfhJ2"></div><div class="box_m-t-6x__LvLNv box_m-b-6x__RhdjX page-layout_page-main__W1JTS grid-item_grid-item-medium__GhKvB"><div data-testid="docs-content-layout" class="grid_dex-grid-container__ZLJnB grid_dex-docs-content-grid-container__diyxN"><div class="page-layout_content-main-grid-item__VRqbw page-layout_grid-item-column-autosizing__PtGh2 grid-item_grid-item-medium__GhKvB page-layout_limit-width__VDAgU"><h1 data-testid="doc-page-heading" class="box_m-b-3x__A9ryy heading_base__MS64u heading_display-10__HZsS7 content_heading__9PVgB">Development Essentials</h1><div><div><article data-testid="markdown-doc" class="text_base__bZ6a4 text_paragraph-30___agDz nodes_article__2nMA2"><p><span class="box_m-t-1x__GR9iT text_base__bZ6a4 text_paragraph-30___agDz markdown-subheading_subheading__g4TR2">Learn about the Square Developer platform and how Square APIs and SDKs work together.</span></p><div data-testid="toc-narrow" class="box_m-t-3x__rN_qC box_m-b-6x__RhdjX markdown-toc_narrow__ErCJb"><button data-tracking-id="toc-accordion-clicked" aria-expanded="true" aria-controls=":Rgmcpddl6:" class="box_m-t-1x__GR9iT box_m-b-1x__b2HHn box_b-r-6__eFn6m native-button_button__Iabj1 native-button_no-border__LHOho native-button_button-padding__xncbB focus-ring-styles_focus-ring__5P6v0 accordion_accordion__vbQko"><h5 class="box_p-t-1x__1ZOZv box_p-b-1x__E6rAE heading_base__MS64u heading_heading-5__lcRR4">On this page</h5><svg width="20" height="20" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon_icon-color__dAdSt" viewBox="0 0 16 16"><path fill-rule="evenodd" clip-rule="evenodd" d="m12 11.414-4-4-4 4L2.586 10 8 4.586 13.414 10 12 11.414Z" fill="#7B61FF"></path></svg></button><div role="region" id=":Rgmcpddl6:" class="accordion_container__Q6e6I accordion_expanded__gzqmt"><div class="accordion_content__zl9fW"><div class="box_m-b-1x__b2HHn"><a data-tracking-id="sidebar-link-clicked" href="/docs/development-essentials#overview" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_color-20__myvq7 sidebar-link_sidebar-link__hvuMG sidebar-link_sidebar-container__NFtV_">Overview</a></div><div class="box_m-b-1x__b2HHn"><a data-tracking-id="sidebar-link-clicked" href="/docs/development-essentials#a-quick-look-at-the-square-developer-platform" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_color-20__myvq7 sidebar-link_sidebar-link__hvuMG sidebar-link_sidebar-container__NFtV_">A quick look at the Square Developer platform</a></div><div class="box_m-b-1x__b2HHn"><a data-tracking-id="sidebar-link-clicked" href="/docs/development-essentials#start-developing" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_color-20__myvq7 sidebar-link_sidebar-link__hvuMG sidebar-link_sidebar-container__NFtV_">Start developing</a></div><div class="box_m-b-1x__b2HHn"><a data-tracking-id="sidebar-link-clicked" href="/docs/development-essentials#developer-resources" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_color-20__myvq7 sidebar-link_sidebar-link__hvuMG sidebar-link_sidebar-container__NFtV_">Developer resources</a></div><div><a data-tracking-id="sidebar-link-clicked" href="/docs/development-essentials#see-also" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_color-20__myvq7 sidebar-link_sidebar-link__hvuMG sidebar-link_sidebar-container__NFtV_">See also</a></div></div></div></div><div data-markdown-heading="2" class="box_m-t-5x__L06CC box_m-b-2x__nVJGZ"><a href="#overview" id="overview" aria-label="anchor link for overview" class="anchored-heading_anchor__JhuiX"></a><div class="anchored-heading_heading__2wlPu"><div class="anchored-heading_container__rfGXv"><market-tooltip popover-placement="top-start"><a data-tracking-id="heading-anchor" role="link" tabindex="0" slot="trigger" aria-label="click to copy link for overview" class="box_b-r-6__eFn6m native-button_button__Iabj1 native-button_no-border__LHOho native-button_button-padding__xncbB focus-ring-styles_focus-ring__5P6v0 anchored-heading_trigger__XOE12 anchored-heading_button__TMpy8"><svg width="16" height="16" viewBox="0 0 16 16" class="anchored-heading_icon__4HlYl"><path d="M10.432 1.032c-.641.093-.887.239-1.099.649-.056.109-.07.184-.071.391-.001.229.009.276.097.455a.921.921 0 0 0 .486.471c.198.092.446.102.849.035.807-.133 1.657.312 2.034 1.065.161.321.212.538.212.9 0 .361-.05.573-.216.916-.122.254-.131.262-1.778 1.91C9.299 9.471 9.29 9.48 9.036 9.602c-.375.182-.572.223-.988.207-.538-.021-.887-.163-1.303-.533-.259-.23-.453-.312-.741-.313a.971.971 0 0 0-.681.263c-.2.18-.29.382-.304.684-.017.354.065.54.365.829.502.484 1.096.81 1.797.986.424.107 1.137.133 1.589.059.366-.06.832-.209 1.141-.364.549-.276.665-.378 2.46-2.172 1.462-1.462 1.725-1.738 1.886-1.982.483-.732.692-1.417.692-2.269 0-1.11-.398-2.063-1.189-2.844a3.97 3.97 0 0 0-2.019-1.074 4.553 4.553 0 0 0-1.309-.047M6.93 3.694a4.276 4.276 0 0 0-1.955.778c-.103.074-.931.877-1.839 1.786C1.352 8.041 1.242 8.167.959 8.75c-.171.354-.25.583-.336.974-.083.379-.088 1.156-.011 1.518.34 1.59 1.458 2.767 2.996 3.155.256.065.401.081.835.093 1.025.028 1.494-.153 1.731-.666a.786.786 0 0 0 .082-.411.753.753 0 0 0-.098-.426 1.004 1.004 0 0 0-.482-.476c-.157-.077-.462-.089-.897-.036-.628.078-1.179-.115-1.645-.575a1.563 1.563 0 0 1-.354-.495c-.3-.608-.3-1.185-.001-1.799l.14-.285 1.64-1.639c1.567-1.566 1.65-1.644 1.88-1.761.34-.173.568-.228.946-.228.525 0 .954.164 1.36.522.293.257.404.307.714.323.234.012.277.005.442-.069.226-.101.452-.331.533-.54.084-.22.078-.58-.014-.787-.128-.287-.727-.792-1.249-1.053-.64-.319-1.553-.48-2.241-.395" fill-rule="evenodd"></path></svg></a><span slot="content">Link to section</span></market-tooltip></div><h2 class="heading_base__MS64u heading_heading-30__MH4YZ">Overview</h2></div></div><p>The <span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/homepage" class="nodes_markdown-link__1J6_a">Square Developer platform</a></span> provides APIs, SDKs, and tools that developers can use to integrate with Square business solutions. Millions of sellers use Square hardware (such as Terminal and Reader) and products (such as Square Point of Sale, Square for Retail, Restaurant POS, and the Square Dashboard) to run their business.</p><p>The developer platform supports independent and partner developers who:</p><ul><li>Work in-house for a seller.</li><li>Offer custom applications to Square sellers directly or in the Square App Marketplace.</li><li>Build custom solutions for businesses as a Square Solutions Partner.</li></ul><p>Square APIs provide payment, commerce, customer, staff, and merchant capabilities that can be used as building blocks to support a broad range of business needs and create experiences that help sellers grow their business. The developer platform also provides SDKs, tools, and other resources that help developers to build, test, and monitor their applications.</p><div data-markdown-heading="2" class="box_m-t-5x__L06CC box_m-b-2x__nVJGZ"><a href="#a-quick-look-at-the-square-developer-platform" id="a-quick-look-at-the-square-developer-platform" aria-label="anchor link for a-quick-look-at-the-square-developer-platform" class="anchored-heading_anchor__JhuiX"></a><div class="anchored-heading_heading__2wlPu"><div class="anchored-heading_container__rfGXv"><market-tooltip popover-placement="top-start"><a data-tracking-id="heading-anchor" role="link" tabindex="0" slot="trigger" aria-label="click to copy link for a-quick-look-at-the-square-developer-platform" class="box_b-r-6__eFn6m native-button_button__Iabj1 native-button_no-border__LHOho native-button_button-padding__xncbB focus-ring-styles_focus-ring__5P6v0 anchored-heading_trigger__XOE12 anchored-heading_button__TMpy8"><svg width="16" height="16" viewBox="0 0 16 16" class="anchored-heading_icon__4HlYl"><path d="M10.432 1.032c-.641.093-.887.239-1.099.649-.056.109-.07.184-.071.391-.001.229.009.276.097.455a.921.921 0 0 0 .486.471c.198.092.446.102.849.035.807-.133 1.657.312 2.034 1.065.161.321.212.538.212.9 0 .361-.05.573-.216.916-.122.254-.131.262-1.778 1.91C9.299 9.471 9.29 9.48 9.036 9.602c-.375.182-.572.223-.988.207-.538-.021-.887-.163-1.303-.533-.259-.23-.453-.312-.741-.313a.971.971 0 0 0-.681.263c-.2.18-.29.382-.304.684-.017.354.065.54.365.829.502.484 1.096.81 1.797.986.424.107 1.137.133 1.589.059.366-.06.832-.209 1.141-.364.549-.276.665-.378 2.46-2.172 1.462-1.462 1.725-1.738 1.886-1.982.483-.732.692-1.417.692-2.269 0-1.11-.398-2.063-1.189-2.844a3.97 3.97 0 0 0-2.019-1.074 4.553 4.553 0 0 0-1.309-.047M6.93 3.694a4.276 4.276 0 0 0-1.955.778c-.103.074-.931.877-1.839 1.786C1.352 8.041 1.242 8.167.959 8.75c-.171.354-.25.583-.336.974-.083.379-.088 1.156-.011 1.518.34 1.59 1.458 2.767 2.996 3.155.256.065.401.081.835.093 1.025.028 1.494-.153 1.731-.666a.786.786 0 0 0 .082-.411.753.753 0 0 0-.098-.426 1.004 1.004 0 0 0-.482-.476c-.157-.077-.462-.089-.897-.036-.628.078-1.179-.115-1.645-.575a1.563 1.563 0 0 1-.354-.495c-.3-.608-.3-1.185-.001-1.799l.14-.285 1.64-1.639c1.567-1.566 1.65-1.644 1.88-1.761.34-.173.568-.228.946-.228.525 0 .954.164 1.36.522.293.257.404.307.714.323.234.012.277.005.442-.069.226-.101.452-.331.533-.54.084-.22.078-.58-.014-.787-.128-.287-.727-.792-1.249-1.053-.64-.319-1.553-.48-2.241-.395" fill-rule="evenodd"></path></svg></a><span slot="content">Link to section</span></market-tooltip></div><h2 class="heading_base__MS64u heading_heading-30__MH4YZ">A quick look at the Square Developer platform</h2></div></div><p>The following video shows how your application connects with Square sellers and how Square APIs work together.</p><div data-testid="youtube-player" class="box_m-t-3x__rN_qC box_m-b-3x__A9ryy box_b-r-6__eFn6m markdown-youtube-player_container__JNB6d"><iframe class="markdown-youtube-player_iframe__EU8IE" src="https://www.youtube.com/embed/hoAUHJfokbg" title="Youtube video player" frameBorder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></div><div data-markdown-heading="2" class="box_m-t-5x__L06CC box_m-b-2x__nVJGZ"><a href="#start-developing" id="start-developing" aria-label="anchor link for start-developing" class="anchored-heading_anchor__JhuiX"></a><div class="anchored-heading_heading__2wlPu"><div class="anchored-heading_container__rfGXv"><market-tooltip popover-placement="top-start"><a data-tracking-id="heading-anchor" role="link" tabindex="0" slot="trigger" aria-label="click to copy link for start-developing" class="box_b-r-6__eFn6m native-button_button__Iabj1 native-button_no-border__LHOho native-button_button-padding__xncbB focus-ring-styles_focus-ring__5P6v0 anchored-heading_trigger__XOE12 anchored-heading_button__TMpy8"><svg width="16" height="16" viewBox="0 0 16 16" class="anchored-heading_icon__4HlYl"><path d="M10.432 1.032c-.641.093-.887.239-1.099.649-.056.109-.07.184-.071.391-.001.229.009.276.097.455a.921.921 0 0 0 .486.471c.198.092.446.102.849.035.807-.133 1.657.312 2.034 1.065.161.321.212.538.212.9 0 .361-.05.573-.216.916-.122.254-.131.262-1.778 1.91C9.299 9.471 9.29 9.48 9.036 9.602c-.375.182-.572.223-.988.207-.538-.021-.887-.163-1.303-.533-.259-.23-.453-.312-.741-.313a.971.971 0 0 0-.681.263c-.2.18-.29.382-.304.684-.017.354.065.54.365.829.502.484 1.096.81 1.797.986.424.107 1.137.133 1.589.059.366-.06.832-.209 1.141-.364.549-.276.665-.378 2.46-2.172 1.462-1.462 1.725-1.738 1.886-1.982.483-.732.692-1.417.692-2.269 0-1.11-.398-2.063-1.189-2.844a3.97 3.97 0 0 0-2.019-1.074 4.553 4.553 0 0 0-1.309-.047M6.93 3.694a4.276 4.276 0 0 0-1.955.778c-.103.074-.931.877-1.839 1.786C1.352 8.041 1.242 8.167.959 8.75c-.171.354-.25.583-.336.974-.083.379-.088 1.156-.011 1.518.34 1.59 1.458 2.767 2.996 3.155.256.065.401.081.835.093 1.025.028 1.494-.153 1.731-.666a.786.786 0 0 0 .082-.411.753.753 0 0 0-.098-.426 1.004 1.004 0 0 0-.482-.476c-.157-.077-.462-.089-.897-.036-.628.078-1.179-.115-1.645-.575a1.563 1.563 0 0 1-.354-.495c-.3-.608-.3-1.185-.001-1.799l.14-.285 1.64-1.639c1.567-1.566 1.65-1.644 1.88-1.761.34-.173.568-.228.946-.228.525 0 .954.164 1.36.522.293.257.404.307.714.323.234.012.277.005.442-.069.226-.101.452-.331.533-.54.084-.22.078-.58-.014-.787-.128-.287-.727-.792-1.249-1.053-.64-.319-1.553-.48-2.241-.395" fill-rule="evenodd"></path></svg></a><span slot="content">Link to section</span></market-tooltip></div><h2 class="heading_base__MS64u heading_heading-30__MH4YZ">Start developing</h2></div></div><p>To build on the Square Developer platform, you need a <span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/get-started/create-account-and-application" class="nodes_markdown-link__1J6_a">Square account and an application</a></span>.</p><ul><li><p>A Square account represents an entity (person, business, or organization) that uses Square products or APIs to manage resources. For example, they might process payments, manage orders and inventory, and store customer data. Calls to Square APIs are made within the context of a Square account based on the <span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/build-basics/access-tokens" class="nodes_markdown-link__1J6_a">access token</a></span> in the request.</p><p>An account enables access to the <span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/devtools/developer-dashboard" class="nodes_markdown-link__1J6_a">Developer Console</a></span> and other developer and seller tools. While testing, you can create resources and process payments in your own account. Later, any <span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/payments-api/take-payments-and-collect-fees" class="nodes_markdown-link__1J6_a">application fees</a></span> that you collect to monetize your application are credited to your account.</p></li><li><p>An application stores configuration settings, such as the default Square API version used for API calls or the application ID and secret used to identify and authenticate your application in the OAuth code flow. You can access and manage settings from the Developer Console.</p></li></ul><p>After creating your account and registering an application, use Square developer resources to explore Square APIs and begin developing. A good place to start is <span slot="trigger"><a data-tracking-id="markdown-link" href="https://developer.squareup.com/explorer/square" class="nodes_markdown-link__1J6_a">API Explorer</a></span>, which is an interactive tool that lets you sign in with your Square account, choose an access token, and build and send Square API requests in the Sandbox or production environment.</p><p>During development, it's also a good idea to learn about requirements for <span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/app-marketplace" class="nodes_markdown-link__1J6_a">publishing your application to the App Marketplace</a></span>. If you need help along the way, <span slot="trigger"><a data-tracking-id="markdown-link" href="https://squareup.com/help/contact?panel=BF53A9C8EF68" class="nodes_markdown-link__1J6_a">contact Developer Support</a></span>, reach out in the <span slot="trigger"><a data-tracking-id="markdown-link" href="https://developer.squareup.com/forums" class="nodes_markdown-link__1J6_a">forums</a></span>, or join our <span slot="trigger"><a data-tracking-id="markdown-link" href="https://discord.gg/squaredev" class="nodes_markdown-link__1J6_a">Discord community</a></span>.</p><div data-markdown-heading="2" class="box_m-t-5x__L06CC box_m-b-2x__nVJGZ"><a href="#developer-resources" id="developer-resources" aria-label="anchor link for developer-resources" class="anchored-heading_anchor__JhuiX"></a><div class="anchored-heading_heading__2wlPu"><div class="anchored-heading_container__rfGXv"><market-tooltip popover-placement="top-start"><a data-tracking-id="heading-anchor" role="link" tabindex="0" slot="trigger" aria-label="click to copy link for developer-resources" class="box_b-r-6__eFn6m native-button_button__Iabj1 native-button_no-border__LHOho native-button_button-padding__xncbB focus-ring-styles_focus-ring__5P6v0 anchored-heading_trigger__XOE12 anchored-heading_button__TMpy8"><svg width="16" height="16" viewBox="0 0 16 16" class="anchored-heading_icon__4HlYl"><path d="M10.432 1.032c-.641.093-.887.239-1.099.649-.056.109-.07.184-.071.391-.001.229.009.276.097.455a.921.921 0 0 0 .486.471c.198.092.446.102.849.035.807-.133 1.657.312 2.034 1.065.161.321.212.538.212.9 0 .361-.05.573-.216.916-.122.254-.131.262-1.778 1.91C9.299 9.471 9.29 9.48 9.036 9.602c-.375.182-.572.223-.988.207-.538-.021-.887-.163-1.303-.533-.259-.23-.453-.312-.741-.313a.971.971 0 0 0-.681.263c-.2.18-.29.382-.304.684-.017.354.065.54.365.829.502.484 1.096.81 1.797.986.424.107 1.137.133 1.589.059.366-.06.832-.209 1.141-.364.549-.276.665-.378 2.46-2.172 1.462-1.462 1.725-1.738 1.886-1.982.483-.732.692-1.417.692-2.269 0-1.11-.398-2.063-1.189-2.844a3.97 3.97 0 0 0-2.019-1.074 4.553 4.553 0 0 0-1.309-.047M6.93 3.694a4.276 4.276 0 0 0-1.955.778c-.103.074-.931.877-1.839 1.786C1.352 8.041 1.242 8.167.959 8.75c-.171.354-.25.583-.336.974-.083.379-.088 1.156-.011 1.518.34 1.59 1.458 2.767 2.996 3.155.256.065.401.081.835.093 1.025.028 1.494-.153 1.731-.666a.786.786 0 0 0 .082-.411.753.753 0 0 0-.098-.426 1.004 1.004 0 0 0-.482-.476c-.157-.077-.462-.089-.897-.036-.628.078-1.179-.115-1.645-.575a1.563 1.563 0 0 1-.354-.495c-.3-.608-.3-1.185-.001-1.799l.14-.285 1.64-1.639c1.567-1.566 1.65-1.644 1.88-1.761.34-.173.568-.228.946-.228.525 0 .954.164 1.36.522.293.257.404.307.714.323.234.012.277.005.442-.069.226-.101.452-.331.533-.54.084-.22.078-.58-.014-.787-.128-.287-.727-.792-1.249-1.053-.64-.319-1.553-.48-2.241-.395" fill-rule="evenodd"></path></svg></a><span slot="content">Link to section</span></market-tooltip></div><h2 class="heading_base__MS64u heading_heading-30__MH4YZ">Developer resources</h2></div></div><p>The following topics describe Square developer resources:</p><ul><li><span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/square-get-started" class="nodes_markdown-link__1J6_a">Get Started</a></span> - Shows how to sign up for a Square account, make your first API call in the Square Sandbox, and view logs of your API calls. During the sign-up flow, Square registers an application for your account.</li><li><span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/buildbasics" class="nodes_markdown-link__1J6_a">Build Basics</a></span> - General design concepts and patterns that you should understand when using the developer platform.</li><li><span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/devtools/overview" class="nodes_markdown-link__1J6_a">Developer Tools</a></span> - Detailed documentation about using Square developer tools, such as the Square Sandbox, API Explorer, and API Logs.</li><li><span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/sdks" class="nodes_markdown-link__1J6_a">Square SDKs</a></span> - Describes the backend platform SDKs for Square APIs that let you code in common programming languages.</li><li><span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/sample-apps" class="nodes_markdown-link__1J6_a">Sample Applications</a></span> - A list of sample applications that demonstrate how to call Square APIs, Square SDKs, or client-side payment SDKs and libraries for payment processing and other business use cases.</li><li><span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/devtools/graphql" class="nodes_markdown-link__1J6_a">GraphQL</a></span> - Lets you request exactly the data you need from supported Square graphs (such as orders, payments, catalog, and customers) with faster and more compact data transfers.</li><li><span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/oauth-api/overview" class="nodes_markdown-link__1J6_a">OAuth API</a></span> - Used to request and manage permissions from Square sellers that allow an application to access resources in seller accounts.</li><li><span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/webhooks/webhook-subscriptions-api" class="nodes_markdown-link__1J6_a">Webhook Subscriptions API</a></span> - Used to programmatically create and manage an application's webhook subscriptions.</li><li><span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/events-api/overview" class="nodes_markdown-link__1J6_a">Events API</a></span> - Used to programmatically pull webhook events.</li><li><span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/migrate-from-v1" class="nodes_markdown-link__1J6_a">Migrate from Deprecated APIs</a></span> - An overview of the retirement process for Square APIs and migration guides for specific deprecated APIs.</li><li><span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/international-development" class="nodes_markdown-link__1J6_a">International Development</a></span> - Key considerations for creating applications for sellers in other countries.</li></ul><div data-testid="aside" data-test-type="info" class="box_m-t-4x__FOwYa box_m-b-4x__jr_IJ box_p-l-2x__0A2_9 box_p-r-2x__z29W6 box_p-t-2x__M5RH8 box_p-b-2x__bSkd6 box_b-r-6__eFn6m box_sh-10__rHmX2 aside_aside__hEkR5 aside_info__6S1z3"><h4 class="box_m-b-1x__b2HHn text_base__bZ6a4 text_paragraph-30___agDz text_semi-bold-30__Z4S5R">Note</h4><div data-testid="aside-content"><p>In addition to platform SDKs, Square provides payment processing SDKs for <span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/online-payment-options" class="nodes_markdown-link__1J6_a">online</a></span>, <span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/in-app-payments" class="nodes_markdown-link__1J6_a">in-app</a></span>, and <span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/in-person-payment-options" class="nodes_markdown-link__1J6_a">in-person</a></span> channels.</p></div></div><div data-markdown-heading="2" class="box_m-t-5x__L06CC box_m-b-2x__nVJGZ"><a href="#see-also" id="see-also" aria-label="anchor link for see-also" class="anchored-heading_anchor__JhuiX"></a><div class="anchored-heading_heading__2wlPu"><div class="anchored-heading_container__rfGXv"><market-tooltip popover-placement="top-start"><a data-tracking-id="heading-anchor" role="link" tabindex="0" slot="trigger" aria-label="click to copy link for see-also" class="box_b-r-6__eFn6m native-button_button__Iabj1 native-button_no-border__LHOho native-button_button-padding__xncbB focus-ring-styles_focus-ring__5P6v0 anchored-heading_trigger__XOE12 anchored-heading_button__TMpy8"><svg width="16" height="16" viewBox="0 0 16 16" class="anchored-heading_icon__4HlYl"><path d="M10.432 1.032c-.641.093-.887.239-1.099.649-.056.109-.07.184-.071.391-.001.229.009.276.097.455a.921.921 0 0 0 .486.471c.198.092.446.102.849.035.807-.133 1.657.312 2.034 1.065.161.321.212.538.212.9 0 .361-.05.573-.216.916-.122.254-.131.262-1.778 1.91C9.299 9.471 9.29 9.48 9.036 9.602c-.375.182-.572.223-.988.207-.538-.021-.887-.163-1.303-.533-.259-.23-.453-.312-.741-.313a.971.971 0 0 0-.681.263c-.2.18-.29.382-.304.684-.017.354.065.54.365.829.502.484 1.096.81 1.797.986.424.107 1.137.133 1.589.059.366-.06.832-.209 1.141-.364.549-.276.665-.378 2.46-2.172 1.462-1.462 1.725-1.738 1.886-1.982.483-.732.692-1.417.692-2.269 0-1.11-.398-2.063-1.189-2.844a3.97 3.97 0 0 0-2.019-1.074 4.553 4.553 0 0 0-1.309-.047M6.93 3.694a4.276 4.276 0 0 0-1.955.778c-.103.074-.931.877-1.839 1.786C1.352 8.041 1.242 8.167.959 8.75c-.171.354-.25.583-.336.974-.083.379-.088 1.156-.011 1.518.34 1.59 1.458 2.767 2.996 3.155.256.065.401.081.835.093 1.025.028 1.494-.153 1.731-.666a.786.786 0 0 0 .082-.411.753.753 0 0 0-.098-.426 1.004 1.004 0 0 0-.482-.476c-.157-.077-.462-.089-.897-.036-.628.078-1.179-.115-1.645-.575a1.563 1.563 0 0 1-.354-.495c-.3-.608-.3-1.185-.001-1.799l.14-.285 1.64-1.639c1.567-1.566 1.65-1.644 1.88-1.761.34-.173.568-.228.946-.228.525 0 .954.164 1.36.522.293.257.404.307.714.323.234.012.277.005.442-.069.226-.101.452-.331.533-.54.084-.22.078-.58-.014-.787-.128-.287-.727-.792-1.249-1.053-.64-.319-1.553-.48-2.241-.395" fill-rule="evenodd"></path></svg></a><span slot="content">Link to section</span></market-tooltip></div><h2 class="heading_base__MS64u heading_heading-30__MH4YZ">See also</h2></div></div><ul><li><span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/payments-overview" class="nodes_markdown-link__1J6_a">Payment APIs and SDKs</a></span></li><li><span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/commerce" class="nodes_markdown-link__1J6_a">Commerce APIs</a></span></li><li><span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/customers" class="nodes_markdown-link__1J6_a">Customer APIs</a></span></li><li><span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/staff" class="nodes_markdown-link__1J6_a">Staff APIs</a></span></li><li><span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/merchant-details" class="nodes_markdown-link__1J6_a">Merchant APIs</a></span></li><li><span slot="trigger"><a data-tracking-id="markdown-link" href="https://developer.squareup.com/reference/square" class="nodes_markdown-link__1J6_a">Square API Reference</a></span></li><li><span slot="trigger"><a data-tracking-id="markdown-link" href="https://www.youtube.com/channel/UC1N2X6PEMGo2xjJY1Pm0vng" class="nodes_markdown-link__1J6_a">Video: Square Developer</a></span></li></ul></article></div></div></div><div class="box_m-t-8x__7Ip7V grid-item_grid-item-small__Xb5VI page-layout_sidebar-floating-toc__oeaXi"><div data-testid="ftoc" class="sticky-container_container__FNSI1 floating-toc_docs-floating-toc__UfFM_"><h5 data-testid="docs-heading" class="heading_base__MS64u heading_heading-5__lcRR4">On this page</h5><div data-testid="ftoc-scroll" class="box_m-t-1x__GR9iT box_m-b-1x__b2HHn floating-toc_docs-scrollable-el__7yERK"><a data-tracking-id="floating-toc-item" data-tracking-extra="{"title":"Overview"}" href="/docs/development-essentials#overview" class="box_m-b-1x__b2HHn text_base__bZ6a4 text_paragraph-20__2lYBq text_color-20__myvq7 sidebar-link_sidebar-link__hvuMG sidebar-link_sidebar-container__NFtV_ floating-toc_docs-item__J_ik3">Overview</a><a data-tracking-id="floating-toc-item" data-tracking-extra="{"title":"A quick look at the Square Developer platform"}" href="/docs/development-essentials#a-quick-look-at-the-square-developer-platform" class="box_m-b-1x__b2HHn text_base__bZ6a4 text_paragraph-20__2lYBq text_color-20__myvq7 sidebar-link_sidebar-link__hvuMG sidebar-link_sidebar-container__NFtV_ floating-toc_docs-item__J_ik3">A quick look at the Square Developer platform</a><a data-tracking-id="floating-toc-item" data-tracking-extra="{"title":"Start developing"}" href="/docs/development-essentials#start-developing" class="box_m-b-1x__b2HHn text_base__bZ6a4 text_paragraph-20__2lYBq text_color-20__myvq7 sidebar-link_sidebar-link__hvuMG sidebar-link_sidebar-container__NFtV_ floating-toc_docs-item__J_ik3">Start developing</a><a data-tracking-id="floating-toc-item" data-tracking-extra="{"title":"Developer resources"}" href="/docs/development-essentials#developer-resources" class="box_m-b-1x__b2HHn text_base__bZ6a4 text_paragraph-20__2lYBq text_color-20__myvq7 sidebar-link_sidebar-link__hvuMG sidebar-link_sidebar-container__NFtV_ floating-toc_docs-item__J_ik3">Developer resources</a><a data-tracking-id="floating-toc-item" data-tracking-extra="{"title":"See also"}" href="/docs/development-essentials#see-also" class="box_m-b-1x__b2HHn text_base__bZ6a4 text_paragraph-20__2lYBq text_color-20__myvq7 sidebar-link_sidebar-link__hvuMG sidebar-link_sidebar-container__NFtV_ floating-toc_docs-item__J_ik3">See also</a></div></div></div><div class="grid-item_grid-item-full__LsU8d"><div data-testid="docs-feedback-prompt" class="box_p-t-8x__SI6nV box_p-b-2x__bSkd6 box_b-t-l-10__Aa_Rv doc-feedback-prompt_container__E7_8O"><div class="box_m-b-2x__nVJGZ"><div class="feedback-widget_large__PmiLi"><div></div></div></div><article data-testid="markdown-doc" class="text_base__bZ6a4 text_paragraph-30___agDz 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Millions of sellers use Square hardware (such as Terminal and Reader) and products (such as Square Point of Sale, Square for Retail, Restaurant POS, and the Square Dashboard) to run their business.\n\nThe developer platform supports independent and partner developers who:\n* Work in-house for a seller.\n* Offer custom applications to Square sellers directly or in the Square App Marketplace.\n* Build custom solutions for businesses as a Square Solutions Partner.\n\nSquare APIs provide payment, commerce, customer, staff, and merchant capabilities that can be used as building blocks to support a broad range of business needs and create experiences that help sellers grow their business. The developer platform also provides SDKs, tools, and other resources that help developers to build, test, and monitor their applications. \n\n## A quick look at the Square Developer platform\nThe following video shows how your application connects with Square sellers and how Square APIs work together.\n\n{% youtube src=\"https://www.youtube.com/embed/hoAUHJfokbg\" /%}\n\n## Start developing\n\nTo build on the Square Developer platform, you need a [Square account and an application](get-started/create-account-and-application).\n\n* A Square account represents an entity (person, business, or organization) that uses Square products or APIs to manage resources. For example, they might process payments, manage orders and inventory, and store customer data. Calls to Square APIs are made within the context of a Square account based on the [access token](build-basics/access-tokens) in the request.\n\n An account enables access to the [Developer Console](devtools/developer-dashboard) and other developer and seller tools. While testing, you can create resources and process payments in your own account. Later, any [application fees](payments-api/take-payments-and-collect-fees) that you collect to monetize your application are credited to your account.\n\n* An application stores configuration settings, such as the default Square API version used for API calls or the application ID and secret used to identify and authenticate your application in the OAuth code flow. You can access and manage settings from the Developer Console.\n\nAfter creating your account and registering an application, use Square developer resources to explore Square APIs and begin developing. A good place to start is [API Explorer](https://developer.{{SQUARE_DOMAIN}}/explorer/square), which is an interactive tool that lets you sign in with your Square account, choose an access token, and build and send Square API requests in the Sandbox or production environment.\n\nDuring development, it's also a good idea to learn about requirements for [publishing your application to the App Marketplace](app-marketplace). If you need help along the way, [contact Developer Support](https://{{SQUARE_DOMAIN}}/help/contact?panel=BF53A9C8EF68), reach out in the [forums](https://developer.{{SQUARE_DOMAIN}}/forums), or join our [Discord community](https://discord.gg/squaredev).\n\n## Developer resources\n\nThe following topics describe Square developer resources:\n\n* [Get Started](square-get-started) - Shows how to sign up for a Square account, make your first API call in the Square Sandbox, and view logs of your API calls. During the sign-up flow, Square registers an application for your account.\n* [Build Basics](buildbasics) - General design concepts and patterns that you should understand when using the developer platform.\n* [Developer Tools](devtools/overview) - Detailed documentation about using Square developer tools, such as the Square Sandbox, API Explorer, and API Logs.\n* [Square SDKs](sdks) - Describes the backend platform SDKs for Square APIs that let you code in common programming languages.\n* [Sample Applications](sample-apps) - A list of sample applications that demonstrate how to call Square APIs, Square SDKs, or client-side payment SDKs and libraries for payment processing and other business use cases.\n* [GraphQL](devtools/graphql) - Lets you request exactly the data you need from supported Square graphs (such as orders, payments, catalog, and customers) with faster and more compact data transfers.\n* [OAuth API](oauth-api/overview) - Used to request and manage permissions from Square sellers that allow an application to access resources in seller accounts.\n* [Webhook Subscriptions API](webhooks/webhook-subscriptions-api) - Used to programmatically create and manage an application's webhook subscriptions.\n* [Events API](events-api/overview) - Used to programmatically pull webhook events.\n* [Migrate from Deprecated APIs](migrate-from-v1) - An overview of the retirement process for Square APIs and migration guides for specific deprecated APIs.\n* [International Development](international-development) - Key considerations for creating applications for sellers in other countries.\n\n{% aside type=\"info\" %}\nIn addition to platform SDKs, Square provides payment processing SDKs for [online](online-payment-options), [in-app](in-app-payments), and [in-person](in-person-payment-options) channels.\n{% /aside %}\n\n## See also\n\n* [Payment APIs and SDKs](payments-overview)\n* [Commerce APIs](commerce)\n* [Customer APIs](customers)\n* [Staff APIs](staff)\n* [Merchant APIs](merchant-details)\n* [Square API Reference](https://developer.{{SQUARE_DOMAIN}}/reference/square)\n* [Video: Square Developer](https://www.youtube.com/channel/UC1N2X6PEMGo2xjJY1Pm0vng)","programmingLanguage":"All","platform":"All"}]},"requirementsDomain":null},"navSet":{"value":{"items":[{"type":"link","url":"/","title":"Docs Home"},{"type":"divider","style":"divider"},{"id":"iO7IcPwigJctqIkoJ11Zo","type":"subcategory","items":[{"id":"7dlzvOUwboNqjIqujGxzcq","type":"subcategory","items":[{"type":"link","url":"/get-started/create-account-and-application","title":"Create an Account and App"},{"type":"link","url":"/get-started/make-api-request","title":"Make your First API Call"},{"type":"link","url":"/get-started/view-log","title":"View the API Logs"},{"type":"link","url":"/get-started/verify-transaction-in-seller-dashboard","title":"Verify the Payment"},{"type":"link","url":"/get-started/what-next","title":"What's Next"}],"title":"Get 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