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href="/oauth2-servers/accessing-data/create-an-application/" data-section="2.1">Create an Application</a></li> <li class="page_item page-item-903"><a href="/oauth2-servers/accessing-data/setting-up-the-environment/" data-section="2.2">Setting up the Environment</a></li> <li class="page_item page-item-907"><a href="/oauth2-servers/accessing-data/authorization-request/" data-section="2.3">Authorization Request</a></li> <li class="page_item page-item-910"><a href="/oauth2-servers/accessing-data/obtaining-an-access-token/" data-section="2.4">Obtaining an Access Token</a></li> <li class="page_item page-item-912"><a href="/oauth2-servers/accessing-data/making-api-requests/" data-section="4.5">Making API Requests</a></li> </ul> </li> <li class="page_item page-item-28 page_item_has_children"><a href="/oauth2-servers/signing-in-with-google/" data-section="3">Signing in with Google</a> <ul class='children'> <li class="page_item page-item-883"><a href="/oauth2-servers/signing-in-with-google/create-an-application/" data-section="3.1">Create an Application</a></li> <li class="page_item page-item-886"><a href="/oauth2-servers/signing-in-with-google/setting-up-the-environment/" data-section="3.2">Setting up the Environment</a></li> <li class="page_item page-item-888"><a href="/oauth2-servers/signing-in-with-google/authorization-request/" data-section="3.3">Authorization Request</a></li> <li class="page_item page-item-891"><a href="/oauth2-servers/signing-in-with-google/getting-an-id-token/" data-section="3.4">Getting an ID Token</a></li> <li class="page_item page-item-893"><a href="/oauth2-servers/signing-in-with-google/verifying-the-user-info/" data-section="3.5">Verifying the User Info</a></li> </ul> </li> <li class="page_item page-item-95 page_item_has_children"><a href="/oauth2-servers/server-side-apps/" data-section="4">Server-Side Apps</a> <ul class='children'> <li class="page_item page-item-865"><a href="/oauth2-servers/server-side-apps/authorization-code/" data-section="4.1">Authorization Code Grant</a></li> <li class="page_item page-item-869"><a href="/oauth2-servers/server-side-apps/example-flow/" data-section="4.2">Example Flow</a></li> <li class="page_item page-item-872"><a href="/oauth2-servers/server-side-apps/possible-errors/" data-section="4.3">Possible Errors</a></li> <li class="page_item page-item-874"><a href="/oauth2-servers/server-side-apps/user-experience/" data-section="4.4">User Experience and Security Considerations</a></li> </ul> </li> <li class="page_item page-item-36 page_item_has_children"><a href="/oauth2-servers/single-page-apps/" data-section="5">Single-Page Apps</a> <ul class='children'> <li class="page_item page-item-856"><a href="/oauth2-servers/single-page-apps/authorization/" data-section="5.1">Authorization</a></li> <li class="page_item page-item-850"><a href="/oauth2-servers/single-page-apps/example-flow/" data-section="5.2">Example Flow</a></li> <li class="page_item page-item-847"><a href="/oauth2-servers/single-page-apps/implicit-flow/" data-section="5.3">Implicit Flow for Single-Page Apps</a></li> <li class="page_item page-item-854"><a href="/oauth2-servers/single-page-apps/security-considerations/" data-section="5.4">Security Considerations for Single-Page Apps</a></li> </ul> </li> <li class="page_item page-item-33 page_item_has_children"><a href="/oauth2-servers/mobile-and-native-apps/" data-section="6">Mobile and Native Apps</a> <ul class='children'> <li class="page_item page-item-838"><a href="/oauth2-servers/mobile-and-native-apps/authorization/" data-section="6.1">Authorization</a></li> <li class="page_item page-item-841"><a href="/oauth2-servers/mobile-and-native-apps/security-considerations/" data-section="6.2">Security Considerations</a></li> </ul> </li> <li class="page_item page-item-138 page_item_has_children"><a href="/oauth2-servers/making-authenticated-requests/" data-section="7">Making Authenticated Requests</a> <ul class='children'> <li class="page_item page-item-833"><a href="/oauth2-servers/making-authenticated-requests/refreshing-an-access-token/" data-section="7.1">Refresh Tokens</a></li> </ul> </li> <li class="page_item page-item-140 page_item_has_children"><a href="/oauth2-servers/client-registration/" data-section="8">Client Registration</a> <ul class='children'> <li class="page_item page-item-142"><a href="/oauth2-servers/client-registration/registering-new-application/" data-section="8.1">Registering a New Application</a></li> <li class="page_item page-item-144"><a href="/oauth2-servers/client-registration/client-id-secret/" data-section="8.2">The Client ID and Secret</a></li> <li class="page_item page-item-146"><a href="/oauth2-servers/client-registration/deleting-applications-revoking-secrets/" data-section="8.3">Deleting Applications and Revoking Secrets</a></li> </ul> </li> <li class="page_item page-item-148 page_item_has_children"><a href="/oauth2-servers/authorization/" data-section="9">Authorization</a> <ul class='children'> <li class="page_item page-item-161"><a href="/oauth2-servers/authorization/the-authorization-request/" data-section="9.1">The Authorization Request</a></li> <li class="page_item page-item-164"><a href="/oauth2-servers/authorization/requiring-user-login/" data-section="9.2">Requiring User Login</a></li> <li class="page_item page-item-166"><a href="/oauth2-servers/authorization/the-authorization-interface/" data-section="9.3">The Authorization Interface</a></li> <li class="page_item page-item-168"><a href="/oauth2-servers/authorization/the-authorization-response/" data-section="9.4">The Authorization Response</a></li> <li class="page_item page-item-170"><a href="/oauth2-servers/authorization/security-considerations/" data-section="9.5">Security Considerations</a></li> </ul> </li> <li class="page_item page-item-174 page_item_has_children"><a href="/oauth2-servers/scope/" data-section="10">Scope</a> <ul class='children'> <li class="page_item page-item-177"><a href="/oauth2-servers/scope/defining-scopes/" data-section="10.1">Defining Scopes</a></li> <li class="page_item page-item-179"><a href="/oauth2-servers/scope/user-interface/" data-section="10.2">User Interface</a></li> <li class="page_item page-item-181"><a href="/oauth2-servers/scope/checkboxes/" data-section="10.3">Checkboxes</a></li> </ul> </li> <li class="page_item page-item-184 page_item_has_children"><a href="/oauth2-servers/redirect-uris/" data-section="11">Redirect URLs</a> <ul class='children'> <li class="page_item page-item-186"><a href="/oauth2-servers/redirect-uris/redirect-uri-registration/" data-section="11.1">Redirect URL Registration</a></li> <li class="page_item page-item-188"><a href="/oauth2-servers/redirect-uris/redirect-uris-native-apps/" data-section="11.2">Redirect URLs for Native Apps</a></li> <li class="page_item page-item-190"><a href="/oauth2-servers/redirect-uris/redirect-uri-validation/" data-section="11.3">Redirect URL Validation</a></li> </ul> </li> <li class="page_item page-item-194 page_item_has_children"><a href="/oauth2-servers/access-tokens/" data-section="12">Access Tokens</a> <ul class='children'> <li class="page_item page-item-196"><a href="/oauth2-servers/access-tokens/authorization-code-request/" data-section="12.1">Authorization Code Request</a></li> <li class="page_item page-item-198"><a href="/oauth2-servers/access-tokens/password-grant/" data-section="12.2">Password Grant</a></li> <li class="page_item page-item-200"><a href="/oauth2-servers/access-tokens/client-credentials/" data-section="12.3">Client Credentials</a></li> <li class="page_item page-item-202"><a href="/oauth2-servers/access-tokens/access-token-response/" data-section="12.4">Access Token Response</a></li> <li class="page_item page-item-204"><a href="/oauth2-servers/access-tokens/self-encoded-access-tokens/" data-section="12.5">Self-Encoded Access Tokens</a></li> <li class="page_item page-item-206"><a href="/oauth2-servers/access-tokens/access-token-lifetime/" data-section="12.6">Access Token Lifetime</a></li> <li class="page_item page-item-208"><a href="/oauth2-servers/access-tokens/refreshing-access-tokens/" data-section="12.7">Refreshing Access Tokens</a></li> </ul> </li> <li class="page_item page-item-210 page_item_has_children"><a href="/oauth2-servers/listing-authorizations/" data-section="13">Listing Authorizations</a> <ul class='children'> <li class="page_item page-item-212"><a href="/oauth2-servers/listing-authorizations/revoking-access/" data-section="13.1">Revoking Access</a></li> </ul> </li> <li class="page_item page-item-216"><a href="/oauth2-servers/the-resource-server/" data-section="14">The Resource Server</a></li> <li class="page_item page-item-608 page_item_has_children"><a href="/oauth2-servers/oauth-native-apps/" data-section="15">OAuth for Native Apps</a> <ul class='children'> <li class="page_item page-item-614"><a href="/oauth2-servers/oauth-native-apps/use-system-browser/" data-section="15.1">Use a System Browser</a></li> <li class="page_item page-item-620"><a href="/oauth2-servers/oauth-native-apps/redirect-urls-for-native-apps/" data-section="15.2">Redirect URLs for Native Apps</a></li> <li class="page_item page-item-626"><a href="/oauth2-servers/oauth-native-apps/pkce/" data-section="15.3">PKCE Extension</a></li> <li class="page_item page-item-627"><a href="/oauth2-servers/oauth-native-apps/checklist-server-support-native-apps/" data-section="15.4">Checklist for Server Support for Native Apps</a></li> </ul> </li> <li class="page_item page-item-640 page_item_has_children"><a href="/oauth2-servers/device-flow/" data-section="16">OAuth for Browserless and Input-Constrained Devices</a> <ul class='children'> <li class="page_item page-item-643"><a href="/oauth2-servers/device-flow/user-flow/" data-section="16.1">User Flow</a></li> <li class="page_item page-item-656"><a href="/oauth2-servers/device-flow/authorization-request/" data-section="16.2">Authorization Request</a></li> <li class="page_item page-item-660"><a href="/oauth2-servers/device-flow/token-request/" data-section="16.3">Token Request</a></li> <li class="page_item page-item-662"><a href="/oauth2-servers/device-flow/authorization-server-requirements/" data-section="16.4">Authorization Server Requirements</a></li> <li class="page_item page-item-666"><a href="/oauth2-servers/device-flow/security-considerations/" data-section="16.5">Security Considerations</a></li> </ul> </li> <li class="page_item page-item-668 page_item_has_children"><a href="/oauth2-servers/pkce/" data-section="17">Protecting Apps with PKCE</a> <ul class='children'> <li class="page_item page-item-670"><a href="/oauth2-servers/pkce/authorization-request/" data-section="17.1">Authorization Request</a></li> <li class="page_item page-item-673"><a href="/oauth2-servers/pkce/authorization-code-exchange/" data-section="17.2">Authorization Code Exchange</a></li> </ul> </li> <li class="page_item page-item-214"><a href="/oauth2-servers/token-introspection-endpoint/" data-section="18">Token Introspection Endpoint</a></li> <li class="page_item page-item-220"><a href="/oauth2-servers/creating-documentation/" data-section="19">Creating Documentation</a></li> <li class="page_item page-item-108 current_page_item"><a href="/oauth2-servers/definitions/" data-section="20">Terminology Reference</a></li> <li class="page_item page-item-136 page_item_has_children"><a href="/oauth2-servers/differences-between-oauth-1-2/" data-section="21">Differences Between OAuth 1 and 2</a> <ul class='children'> <li class="page_item page-item-225"><a href="/oauth2-servers/differences-between-oauth-1-2/authentication-and-signatures/" data-section="21.1">Authentication and Signatures</a></li> <li class="page_item page-item-227"><a href="/oauth2-servers/differences-between-oauth-1-2/user-experience-alternative-token-issuance-options/" data-section="21.2">User Experience and Alternative Token Issuance Options</a></li> <li class="page_item page-item-229"><a href="/oauth2-servers/differences-between-oauth-1-2/performance-at-scale/" data-section="21.3">Performance at Scale</a></li> <li class="page_item page-item-231"><a href="/oauth2-servers/differences-between-oauth-1-2/bearer-tokens/" data-section="21.4">Bearer Tokens</a></li> <li class="page_item page-item-233"><a href="/oauth2-servers/differences-between-oauth-1-2/short-lived-tokens-long-lived-authorizations/" data-section="21.5">Short-lived tokens with Long-lived authorizations</a></li> <li class="page_item page-item-235"><a href="/oauth2-servers/differences-between-oauth-1-2/separation-of-roles/" data-section="21.6">Separation of Roles</a></li> </ul> </li> <li class="page_item page-item-676 page_item_has_children"><a href="/oauth2-servers/openid-connect/" data-section="22">OpenID Connect</a> <ul class='children'> <li class="page_item page-item-678"><a href="/oauth2-servers/openid-connect/authorization-vs-authentication/" data-section="22.1">Authorization vs Authentication</a></li> <li class="page_item page-item-680"><a href="/oauth2-servers/openid-connect/building-an-authentication-framework/" data-section="22.2">Building an Authentication Framework</a></li> <li class="page_item page-item-682"><a href="/oauth2-servers/openid-connect/id-tokens/" data-section="22.3">ID Tokens</a></li> <li class="page_item page-item-684"><a href="/oauth2-servers/openid-connect/summary/" data-section="22.4">Summary</a></li> </ul> </li> <li class="page_item page-item-686 page_item_has_children"><a href="/oauth2-servers/indieauth/" data-section="23">IndieAuth</a> <ul class='children'> <li class="page_item page-item-738"><a href="/oauth2-servers/indieauth/discovery/" data-section="23.1">Discovery</a></li> <li class="page_item page-item-688"><a href="/oauth2-servers/indieauth/sign-in/" data-section="23.2">IndieAuth Sign-In Workflow</a></li> <li class="page_item page-item-690"><a href="/oauth2-servers/indieauth/authorization/" data-section="23.3">IndieAuth Authorization Workflow</a></li> </ul> </li> <li class="page_item page-item-693"><a href="/oauth2-servers/map-oauth-2-0-specs/" data-section="24">Map of OAuth 2.0 Specs</a></li> <li class="page_item page-item-697"><a href="/oauth2-servers/tools-and-libraries/" data-section="25">Tools and Libraries</a></li> <li class="page_item page-item-715"><a href="/oauth2-servers/appendix/">Appendix</a></li> </ul> </li> </ul>  </nav>   <a id="menu-icon-close" href="#"> <?xml version="1.0" encoding="UTF-8"?> <svg width="15px" height="15px" viewBox="0 0 15 15" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">  <title>Close</title> <desc>Created with Sketch.</desc> <defs></defs> <g id="Design" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd"> <g id="OAuth---Table-of-Contents-Menu" transform="translate(-1292.000000, -30.000000)" fill-rule="nonzero" fill="#333333"> <g id="ToC-Menu-Open" transform="translate(993.000000, -16.000000)"> <g id="Close" transform="translate(299.000000, 46.000000)"> <path d="M15.9149259,8.53193792 L-1.05529018,8.53193792 C-1.56341203,8.53193792 -1.97626292,8.12026136 -1.97626292,7.61096518 L-1.97626292,7.24987497 C-1.97626292,6.74175311 -1.56458636,6.32890222 -1.05529018,6.32890222 L15.9161303,6.32890222 C16.4242522,6.32890222 16.8371031,6.74057879 16.8371031,7.24987497 L16.8371031,7.61096518 C16.8359266,8.12026136 16.4242522,8.53193792 15.914956,8.53193792 L15.9149259,8.53193792 Z" id="Shape" transform="translate(7.430420, 7.430420) rotate(-315.000000) translate(-7.430420, -7.430420) "></path> <path d="M15.9149259,8.53193792 L-1.05529018,8.53193792 C-1.56341203,8.53193792 -1.97626292,8.12026136 -1.97626292,7.61096518 L-1.97626292,7.24987497 C-1.97626292,6.74175311 -1.56458636,6.32890222 -1.05529018,6.32890222 L15.9161303,6.32890222 C16.4242522,6.32890222 16.8371031,6.74057879 16.8371031,7.24987497 L16.8371031,7.61096518 C16.8359266,8.12026136 16.4242522,8.53193792 15.914956,8.53193792 L15.9149259,8.53193792 Z" id="Shape-Copy" transform="translate(7.430420, 7.430420) scale(-1, 1) rotate(-315.000000) translate(-7.430420, -7.430420) "></path> </g> </g> </g> </g> </svg> </a> </div>  </header>  </div>  <div id="body" class="clearfix">  <div id="valprop"> <header class="valprop-content"> <h1 class="page-title"> Terminology Reference </h1> </header> <span class="section-number">20</span> </div>   <div id="layout" class="pagewidth-narrow clearfix">  <div id="content" class="clearfix"> <div id="page-108" class="type-page">  <time datetime="2016-08-15"></time> <h1 class="page-title"> </h1>  <div class="page-content entry-content"> <h2>Roles</h2> <p>OAuth defines four roles:</p> <ul> <li>Resource owner (the user)</li> <li>Resource server (the API)</li> <li>Authorization server (can be the same server as the API)</li> <li>Client (the application)</li> </ul> <h3 id="the-user">The User</h3> <p>The OAuth 2.0 spec refers to the user as the “resource owner.” The resource owner is the person who is giving access to some portion of their account. The resources in this case can be data (photos, documents, contacts), services (posting a blog entry, transferring funds), or any other resource requiring access restrictions. Any system that wants to act on behalf of the user must first get permission from them.</p> <h3 id="the-api">The API</h3> <p>The spec refers to what you typically think of as the main API as the “resource server.” The resource server is the server that contains the user’s information that is being accessed by the third-party application. The resource server must be able to accept and validate access tokens and grant the request if the user has allowed it. The resource server does not necessarily need to know about applications.</p> <h3 id="the-authorization-server">The Authorization Server</h3> <p>The authorization server is what the user interacts with when an application is requesting access to their account. This is the server that displays the OAuth prompt, and where the user approves or denies the application’s request. The authorization server is also responsible for granting access tokens after the user authorizes the application.</p> <h3 id="the-client">The Client</h3> <p>The client is the app that is attempting to act on the user’s behalf or access the user’s resources. Before the client can access the user’s account, it needs to obtain permission. The client will obtain permission by either directing the user to the authorization server, or by asserting permission directly with the authorization server without interaction by the user.</p> <h2 id="confidential-clients">Confidential Clients</h2> <p>Confidential clients are clients which have the ability to maintain the confidentiality of the <code>client_secret</code>. Typically these clients are only applications that run on a server under the control of the developer, where the source code is not accessible to users. These types of applications are commonly referred to as “web apps,” since they are most often running on a web server.</p> <h2 id="public-clients">Public Clients</h2> <p>Public clients cannot maintain the confidentiality of a <code>client_secret</code>, so the secret is not used for these apps. Both mobile apps and Javascript apps are considered public clients. Since anyone running a Javascript app can easily view the source code of the application, a secret would be visible there trivially. With mobile applications, the binary can be decompiled to extract strings. Any time the application is running on a device under the user’s control, it should be considered a public client.</p> <h2 id="access-token">Access Token</h2> <p>An access token is the string used when making authenticated requests to the API. The string itself has no meaning to the application using it, but represents that the user has authorized a third-party application to access their account. The token has a corresponding duration of access, scope, and potentially other information the server needs.</p> <h2 id="refresh-token">Refresh Token</h2> <p>A refresh token is a string that is used to get a new access token when an access token expires. Not all APIs use refresh tokens.</p> <h2 id="authorization-code">Authorization Code</h2> <p>An authorization code is an intermediate token used in the server-side app flow, described in more detail in <a href="/oauth2-servers/oauth2-clients/server-side-apps/">Server-Side Apps</a>. An authorization code is returned to the client after the authorization step, and then the client exchanges it for an access token.</p> <div id="themify_builder_content-108" data-postid="108" class="themify_builder_content themify_builder_content-108 themify_builder"> </div>    </div>  </div> </div>  <nav id="page"> <div class="alignleft"> <a href="/oauth2-servers/creating-documentation/"><span>Previous Chapter</span>Creating Documentation</a> </div> <div class="alignright"> <a href="/oauth2-servers/differences-between-oauth-1-2/"><span>Next Chapter</span>Differences Between OAuth 1 and 2</a> </div> </nav> </div>  </div>  <div id="footerwrap" > <footer id="footer" class="pagewidth clearfix" itemscope="itemscope" itemtype="https://schema.org/WPFooter"> <div class="Row u-Flex u-Stretch"> <div class="no-hassle Column--6 Column--medium-12"> <h3>Want to implement OAuth 2.0 without the hassle?</h3> <p>We've built API access management as a service that is secure, scalable, and always on, so 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