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4.99992L11.5 4.99992L11.5 6.99992L6.5 6.99992L3.41421 6.99992L6.70711 10.2928L5.29289 11.707L0.292893 6.70703C-0.0976315 6.31651 -0.0976315 5.68334 0.292893 5.29282ZM16 -6.99382e-07L14 -6.11959e-07L14 12L16 12L16 -6.99382e-07Z" clip-rule="evenodd"></path></svg></button><div data-testid="left-nav" class="box_p-l-3x__N7Usx box_p-r-3x__0IVNa box_p-t-2x__M5RH8 box_p-b-2x__bSkd6 box_b-r-l-std__Q4dy4 left-nav_left-nav__tj2rk"><div aria-expanded="false" aria-controls=":R39l6:" 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":"Get Started"}" href="/docs/square-get-started" 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">Get Started</a><button data-testid="expand-nav-items" data-tracking-id="expand-nav-items" aria-label="Expand navigation items" class="box_b-r-6__eFn6m 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left-nav-items_link__skoFI left-nav-items_sub-level__bbmd6 focus-ring-styles_focus-ring__5P6v0">Verify the Payment</a></div><div class="recursive-nav-item_nav-item-wrap__7yT4s"><a data-tracking-id="left-nav-link" data-tracking-extra="{"title":"What's Next"}" href="/docs/get-started/what-next" 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">What's Next</a></div></div></div><div data-testid="left-nav-divider" class="box_m-l-075x__tnNb9 box_m-r-075x__gXUwj left-nav-items_divider__up2uZ"></div><div 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":"Overview"}" href="/docs/development-essentials" class="text_base__bZ6a4 text_paragraph-30___agDz text_medium-30__U9kB2 left-nav-items_link__skoFI left-nav-items_top-level__zpAn3 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Preferences</a></div></div></div><div aria-expanded="false" aria-controls=":R2q99l6:" class="recursive-nav-item_nav-item-wrap__7yT4s recursive-nav-item_inner-sub-cat__ngiQT"><a data-tracking-id="left-nav-link" data-tracking-extra="{"title":"Common Data Types"}" href="/docs/build-basics/common-data-types" 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">Common Data Types</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" 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focus-ring-styles_focus-ring__5P6v0"><span class="left-nav-items_depth-space__b597h"></span> Working with Monetary Amounts</a></div><div class="recursive-nav-item_nav-item-wrap__7yT4s"><a data-tracking-id="left-nav-link" data-tracking-extra="{"title":"Working with Addresses"}" href="/docs/build-basics/common-data-types/working-with-addresses" 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>Working with Addresses</a></div></div></div><div aria-expanded="false" aria-controls=":R3a99l6:" class="recursive-nav-item_nav-item-wrap__7yT4s recursive-nav-item_inner-sub-cat__ngiQT"><a data-tracking-id="left-nav-link" data-tracking-extra="{"title":"Common Square API Patterns"}" href="/docs/build-basics/common-api-patterns" 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">Common Square API Patterns</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=":R3a99l6:" 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":"Custom Attributes"}" href="/docs/devtools/customattributes/overview" class="text_base__bZ6a4 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focus-ring-styles_focus-ring__5P6v0"><span class="left-nav-items_depth-space__b597h"></span>Pagination</a></div><div class="recursive-nav-item_nav-item-wrap__7yT4s"><a data-tracking-id="left-nav-link" 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 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class="box_m-b-3x__A9ryy heading_base__MS64u heading_display-10__HZsS7 content_heading__9PVgB">Best Practices for Collecting Information</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 best practices for collecting and handling customer information.</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 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sidebar-link_sidebar-container__NFtV_">Only collect what you need</a></div><div class="box_m-b-1x__b2HHn"><a data-tracking-id="sidebar-link-clicked" href="/docs/build-basics/general-considerations/collecting-information#always-use-opt-in-instead-of-opt-out" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_color-20__myvq7 sidebar-link_sidebar-link__hvuMG sidebar-link_sidebar-container__NFtV_">Always use opt-in instead of opt-out</a></div><div class="box_m-b-1x__b2HHn"><a data-tracking-id="sidebar-link-clicked" href="/docs/build-basics/general-considerations/collecting-information#dont-persist-pii" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_color-20__myvq7 sidebar-link_sidebar-link__hvuMG sidebar-link_sidebar-container__NFtV_">Don't persist PII</a></div><div class="box_m-b-1x__b2HHn"><a data-tracking-id="sidebar-link-clicked" href="/docs/build-basics/general-considerations/collecting-information#dont-share-pii" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_color-20__myvq7 sidebar-link_sidebar-link__hvuMG sidebar-link_sidebar-container__NFtV_">Don't share PII</a></div><div class="box_m-b-1x__b2HHn"><a data-tracking-id="sidebar-link-clicked" href="/docs/build-basics/general-considerations/collecting-information#encrypt-customer-information-in-transit" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_color-20__myvq7 sidebar-link_sidebar-link__hvuMG sidebar-link_sidebar-container__NFtV_">Encrypt customer information in transit</a></div><div class="box_m-b-1x__b2HHn"><a data-tracking-id="sidebar-link-clicked" href="/docs/build-basics/general-considerations/collecting-information#handle-customer-data-responsibly" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_color-20__myvq7 sidebar-link_sidebar-link__hvuMG sidebar-link_sidebar-container__NFtV_">Handle customer data responsibly</a></div><div><a data-tracking-id="sidebar-link-clicked" href="/docs/build-basics/general-considerations/collecting-information#additional-build-basics-considerations" class="text_base__bZ6a4 text_paragraph-20__2lYBq text_color-20__myvq7 sidebar-link_sidebar-link__hvuMG sidebar-link_sidebar-container__NFtV_">Additional build basics considerations</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" style="--tooltip-minimum-width:0px;--tooltip-minimum-height:0px"><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>If you collect, or plan to collect, personal information from users, it's critical that you handle that data responsibly.</p><p>Personal identifiable information (PII) includes obvious items such as an email address, phone number, device identifier, physical location, and spending habits. However, even less obvious information such as ZIP codes and typical commute times can be combined to help identify people without their consent.</p><div data-markdown-heading="2" class="box_m-t-5x__L06CC box_m-b-2x__nVJGZ"><a href="#only-collect-what-you-need" id="only-collect-what-you-need" aria-label="anchor link for only-collect-what-you-need" class="anchored-heading_anchor__JhuiX"></a><div class="anchored-heading_heading__2wlPu"><div class="anchored-heading_container__rfGXv"><market-tooltip popover-placement="top-start" style="--tooltip-minimum-width:0px;--tooltip-minimum-height:0px"><a data-tracking-id="heading-anchor" role="link" tabindex="0" slot="trigger" aria-label="click to copy link for only-collect-what-you-need" 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">Only collect what you need</h2></div></div><p>Collect the minimum amount of personal information necessary to provide the desired functionality. For example, if you only use email to communicate with site visitors, there's no reason to also collect phone numbers.</p><div data-markdown-heading="2" class="box_m-t-5x__L06CC box_m-b-2x__nVJGZ"><a href="#always-use-opt-in-instead-of-opt-out" id="always-use-opt-in-instead-of-opt-out" aria-label="anchor link for always-use-opt-in-instead-of-opt-out" class="anchored-heading_anchor__JhuiX"></a><div class="anchored-heading_heading__2wlPu"><div class="anchored-heading_container__rfGXv"><market-tooltip popover-placement="top-start" style="--tooltip-minimum-width:0px;--tooltip-minimum-height:0px"><a data-tracking-id="heading-anchor" role="link" tabindex="0" slot="trigger" aria-label="click to copy link for always-use-opt-in-instead-of-opt-out" 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">Always use opt-in instead of opt-out</h2></div></div><p>Let customers consent to sharing their data rather than collecting their data by default. For example, include a checkbox asking for permission to collect contact information and leave it unchecked by default.</p><div data-markdown-heading="2" class="box_m-t-5x__L06CC box_m-b-2x__nVJGZ"><a href="#dont-persist-pii" id="dont-persist-pii" aria-label="anchor link for dont-persist-pii" class="anchored-heading_anchor__JhuiX"></a><div class="anchored-heading_heading__2wlPu"><div class="anchored-heading_container__rfGXv"><market-tooltip popover-placement="top-start" style="--tooltip-minimum-width:0px;--tooltip-minimum-height:0px"><a data-tracking-id="heading-anchor" role="link" tabindex="0" slot="trigger" aria-label="click to copy link for dont-persist-pii" 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">Don't persist PII</h2></div></div><p>Avoid persistent caching or storage of PII, including in logs. Don't keep the information for longer than needed. The easiest way to avoid unintentionally exposing sensitive information is to delete it when you no longer need it.</p><div data-markdown-heading="2" class="box_m-t-5x__L06CC box_m-b-2x__nVJGZ"><a href="#dont-share-pii" id="dont-share-pii" aria-label="anchor link for dont-share-pii" class="anchored-heading_anchor__JhuiX"></a><div class="anchored-heading_heading__2wlPu"><div class="anchored-heading_container__rfGXv"><market-tooltip popover-placement="top-start" style="--tooltip-minimum-width:0px;--tooltip-minimum-height:0px"><a data-tracking-id="heading-anchor" role="link" tabindex="0" slot="trigger" aria-label="click to copy link for dont-share-pii" 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">Don't share PII</h2></div></div><p>Avoid sharing any PII or location information with third parties. When customers give you permission to collect and save their information, there's an expectation that the information is kept safe and not shared with others. Sharing their information with a third party without asking for explicit permission violates those expectations. You might be complicit if a third party handles the information irresponsibly.</p><div data-markdown-heading="2" class="box_m-t-5x__L06CC box_m-b-2x__nVJGZ"><a href="#encrypt-customer-information-in-transit" id="encrypt-customer-information-in-transit" aria-label="anchor link for encrypt-customer-information-in-transit" class="anchored-heading_anchor__JhuiX"></a><div class="anchored-heading_heading__2wlPu"><div class="anchored-heading_container__rfGXv"><market-tooltip popover-placement="top-start" style="--tooltip-minimum-width:0px;--tooltip-minimum-height:0px"><a data-tracking-id="heading-anchor" role="link" tabindex="0" slot="trigger" aria-label="click to copy link for encrypt-customer-information-in-transit" 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">Encrypt customer information in transit</h2></div></div><p>Secure your website traffic with HTTPS and TLS. If you're unfamiliar with HTTPS and TLS, see <span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/working-with-apis/tls-and-https" class="nodes_markdown-link__1J6_a">TLS and HTTPS</a></span> for more information.</p><div data-markdown-heading="2" class="box_m-t-5x__L06CC box_m-b-2x__nVJGZ"><a href="#handle-customer-data-responsibly" id="handle-customer-data-responsibly" aria-label="anchor link for handle-customer-data-responsibly" class="anchored-heading_anchor__JhuiX"></a><div class="anchored-heading_heading__2wlPu"><div class="anchored-heading_container__rfGXv"><market-tooltip popover-placement="top-start" style="--tooltip-minimum-width:0px;--tooltip-minimum-height:0px"><a data-tracking-id="heading-anchor" role="link" tabindex="0" slot="trigger" aria-label="click to copy link for handle-customer-data-responsibly" 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">Handle customer data responsibly</h2></div></div><p>If your application uses contact information from a <span slot="trigger"><a data-tracking-id="markdown-link" href="https://developer.squareup.com/reference/square/objects/customer" class="nodes_markdown-link__1J6_a">Customer</a></span> object, be sure to use that information judiciously. The following tips describe how to handle customer data responsibly:</p><ul><li>Respect customer email preferences. An <code class="box_p-l-05x__pvvKi box_p-r-05x__PX6jO box_b-r-4__1LPp7 text_base__bZ6a4 text_paragraph-20__2lYBq text_code-field___GL_9 nodes_inline-code__HksNY">email_unsubscribed</code> field set to <code class="box_p-l-05x__pvvKi box_p-r-05x__PX6jO box_b-r-4__1LPp7 text_base__bZ6a4 text_paragraph-20__2lYBq text_code-field___GL_9 nodes_inline-code__HksNY">true</code> indicates that the customer has opted out of marketing emails. Don't use their contact information to send marketing communications.</li><li>Don't store PII such as names, email addresses, and physical addresses without explicit consent.</li><li>Don't store sensitive or payment information in the <code class="box_p-l-05x__pvvKi box_p-r-05x__PX6jO box_b-r-4__1LPp7 text_base__bZ6a4 text_paragraph-20__2lYBq text_code-field___GL_9 nodes_inline-code__HksNY">note</code> field.</li><li>Always use secure HTTPS for your own services to protect user information in transit.</li></ul><div data-markdown-heading="2" class="box_m-t-5x__L06CC box_m-b-2x__nVJGZ"><a href="#additional-build-basics-considerations" id="additional-build-basics-considerations" aria-label="anchor link for additional-build-basics-considerations" class="anchored-heading_anchor__JhuiX"></a><div class="anchored-heading_heading__2wlPu"><div class="anchored-heading_container__rfGXv"><market-tooltip popover-placement="top-start" style="--tooltip-minimum-width:0px;--tooltip-minimum-height:0px"><a data-tracking-id="heading-anchor" role="link" tabindex="0" slot="trigger" aria-label="click to copy link for additional-build-basics-considerations" 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">Additional build basics considerations</h2></div></div><p>There are several other introductory topics provided for a new developer to quickly learn the basics of developing applications with Square. For more information, see <span slot="trigger"><a data-tracking-id="markdown-link" href="/docs/buildbasics" class="nodes_markdown-link__1J6_a">Basics of Building Applications with Square</a></span>.</p></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/build-basics/general-considerations/collecting-information#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":"Only collect what you need"}" href="/docs/build-basics/general-considerations/collecting-information#only-collect-what-you-need" 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">Only collect what you need</a><a data-tracking-id="floating-toc-item" data-tracking-extra="{"title":"Always use opt-in instead of opt-out"}" href="/docs/build-basics/general-considerations/collecting-information#always-use-opt-in-instead-of-opt-out" 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">Always use opt-in instead of opt-out</a><a data-tracking-id="floating-toc-item" data-tracking-extra="{"title":"Don't persist PII"}" href="/docs/build-basics/general-considerations/collecting-information#dont-persist-pii" 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">Don't persist PII</a><a data-tracking-id="floating-toc-item" data-tracking-extra="{"title":"Don't share PII"}" href="/docs/build-basics/general-considerations/collecting-information#dont-share-pii" 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">Don't share PII</a><a data-tracking-id="floating-toc-item" data-tracking-extra="{"title":"Encrypt customer information in transit"}" href="/docs/build-basics/general-considerations/collecting-information#encrypt-customer-information-in-transit" 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">Encrypt customer information in transit</a><a data-tracking-id="floating-toc-item" data-tracking-extra="{"title":"Handle customer data responsibly"}" href="/docs/build-basics/general-considerations/collecting-information#handle-customer-data-responsibly" 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">Handle customer data responsibly</a><a data-tracking-id="floating-toc-item" data-tracking-extra="{"title":"Additional build basics considerations"}" href="/docs/build-basics/general-considerations/collecting-information#additional-build-basics-considerations" 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">Additional build basics considerations</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 nodes_article__2nMA2"><p>If you need more assistance, contact <span slot="trigger"><a data-tracking-id="markdown-link" href="https://squareup.com/help/contact?panel=BF53A9C8EF68" class="nodes_markdown-link__1J6_a">Developer and App Marketplace Support</a></span> or ask for help in the <span slot="trigger"><a data-tracking-id="markdown-link" href="https://developer.squareup.com/forums" class="nodes_markdown-link__1J6_a">Developer Forums</a></span>.</p></article></div></div></div><div class="grid_dex-grid-container__ZLJnB 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However, even less obvious information such as ZIP codes and typical commute times can be combined to help identify people without their consent.\n\n## Only collect what you need\n\nCollect the minimum amount of personal information necessary to provide the desired functionality. For example, if you only use email to communicate with site visitors, there's no reason to also collect phone numbers.\n\n## Always use opt-in instead of opt-out\n\nLet customers consent to sharing their data rather than collecting their data by default. For example, include a checkbox asking for permission to collect contact information and leave it unchecked by default.\n\n## Don't persist PII\n\nAvoid persistent caching or storage of PII, including in logs. Don't keep the information for longer than needed. The easiest way to avoid unintentionally exposing sensitive information is to delete it when you no longer need it. \n\n## Don't share PII\n\nAvoid sharing any PII or location information with third parties. When customers give you permission to collect and save their information, there's an expectation that the information is kept safe and not shared with others. Sharing their information with a third party without asking for explicit permission violates those expectations. You might be complicit if a third party handles the information irresponsibly.\n\n## Encrypt customer information in transit\n\nSecure your website traffic with HTTPS and TLS. If you're unfamiliar with HTTPS and TLS, see [TLS and HTTPS](working-with-apis/tls-and-https) for more information.\n\n## Handle customer data responsibly\n\nIf your application uses contact information from a [Customer](https://developer.{{SQUARE_DOMAIN}}/reference/square/objects/customer) object, be sure to use that information judiciously. The following tips describe how to handle customer data responsibly:\n\n* Respect customer email preferences. An `email_unsubscribed` field set to `true` indicates that the customer has opted out of marketing emails. 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