Perform SMS Verification on a Server | Credential Verification

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track-metadata-eventdetail="https://developers.google.com/identity/sign-in/android/authorize-access" track-metadata-position="nav - authorization" track-metadata-module="tertiary nav" track-metadata-module_headline="call google apis" tooltip > <div class="devsite-nav-item-title"> Authorizing for Android </div> </a> </li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/oauth2/web/guides/overview" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/oauth2/web/guides/overview" track-metadata-position="nav - authorization" track-metadata-module="tertiary nav" track-metadata-module_headline="call google apis" tooltip > <div class="devsite-nav-item-title"> Authorizing for Web </div> </a> </li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/sign-in/ios/api-access" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/sign-in/ios/api-access" track-metadata-position="nav - 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href="https://developers.google.com/identity/blockstore/android" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/blockstore/android" track-metadata-position="nav - credential management" track-metadata-module="tertiary nav" track-metadata-module_headline="android" tooltip > <div class="devsite-nav-item-title"> Blockstore </div> </a> </li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/smartlock-passwords/android/associate-apps-and-sites" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/smartlock-passwords/android/associate-apps-and-sites" track-metadata-position="nav - credential management" track-metadata-module="tertiary nav" track-metadata-module_headline="android" tooltip > <div class="devsite-nav-item-title"> Digital Asset Links </div> </a> </li> <li class="devsite-nav-item"> <a href="https://developer.android.com/guide/topics/text/autofill" track-type="nav" 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href="https://developers.google.com/identity/credential-sharing" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/credential-sharing" track-metadata-position="nav - credential management" track-metadata-module="tertiary nav" track-metadata-module_headline="android" tooltip > <div class="devsite-nav-item-title"> Seamless credential sharing </div> </a> </li> </ul> </div> </div> </div> </tab> <tab class="devsite-dropdown devsite-active "> <a href="https://developers.google.com/identity/credential-verification" track-metadata-eventdetail="https://developers.google.com/identity/credential-verification" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - credential verification" track-metadata-module="primary nav" aria-label="Credential verification, selected" data-category="Site-Wide Custom Events" data-label="Tab: Credential verification" track-name="credential verification" > Credential verification </a> <a href="#" role="button" aria-haspopup="true" aria-expanded="false" aria-label="Dropdown menu for Credential verification" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/credential-verification" track-metadata-position="nav - credential verification" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Credential verification" track-name="credential verification" class="devsite-tabs-dropdown-toggle devsite-icon devsite-icon-arrow-drop-down"></a> <div class="devsite-tabs-dropdown" aria-label="submenu" hidden> <div class="devsite-tabs-dropdown-content"> <div class="devsite-tabs-dropdown-column "> <ul class="devsite-tabs-dropdown-section "> <li class="devsite-nav-title" role="heading" tooltip>Android</li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/sms-retriever/overview" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/sms-retriever/overview" track-metadata-position="nav - credential verification" track-metadata-module="tertiary nav" track-metadata-module_headline="android" tooltip > <div class="devsite-nav-item-title"> Verify users by SMS </div> </a> </li> <li class="devsite-nav-item"> <a href="https://developers.google.com/identity/phone-number-hint/android" track-type="nav" track-metadata-eventdetail="https://developers.google.com/identity/phone-number-hint/android" track-metadata-position="nav - credential verification" track-metadata-module="tertiary nav" track-metadata-module_headline="android" tooltip > <div class="devsite-nav-item-title"> Phone Number Hint </div> </a> </li> </ul> <ul class="devsite-tabs-dropdown-section "> <li class="devsite-nav-title" role="heading" tooltip>Web</li> <li class="devsite-nav-item"> <a href="https://web.dev/web-otp/" track-type="nav" track-metadata-eventdetail="https://web.dev/web-otp/" track-metadata-position="nav - credential verification" track-metadata-module="tertiary nav" track-metadata-module_headline="android" tooltip > <div class="devsite-nav-item-title"> Verify phone numbers on the web </div> </a> </li> </ul> </div> </div> </div> </tab> </nav> </devsite-tabs> </div> <devsite-search enable-signin enable-search enable-suggestions enable-query-completion project-name="Credential Verification" tenant-name="Google for Developers" project-scope="/identity/credential-verification" url-scoped="https://developers.google.com/s/results/identity/credential-verification" > <form class="devsite-search-form" action="https://developers.google.com/s/results" method="GET"> <div class="devsite-search-container"> <button type="button" search-open class="devsite-search-button devsite-header-icon-button button-flat material-icons" aria-label="Open search"></button> <div class="devsite-searchbox"> <input aria-activedescendant="" aria-autocomplete="list" aria-label="Search" aria-expanded="false" aria-haspopup="listbox" autocomplete="off" class="devsite-search-field devsite-search-query" name="q" placeholder="Search" role="combobox" type="text" value="" > <div class="devsite-search-image material-icons" aria-hidden="true"> </div> <div class="devsite-search-shortcut-icon-container" aria-hidden="true"> <kbd class="devsite-search-shortcut-icon">/</kbd> </div> </div> </div> </form> <button type="button" search-close class="devsite-search-button devsite-header-icon-button button-flat material-icons" aria-label="Close search"></button> </devsite-search> </div> <devsite-language-selector> <ul role="presentation"> <li role="presentation"> <a role="menuitem" lang="en" >English</a> </li> <li role="presentation"> <a role="menuitem" lang="de" >Deutsch</a> </li> <li role="presentation"> <a role="menuitem" lang="es" >Español</a> </li> <li role="presentation"> <a role="menuitem" lang="es_419" >Español – América Latina</a> </li> <li role="presentation"> <a role="menuitem" lang="fr" >Français</a> </li> <li role="presentation"> <a role="menuitem" lang="id" >Indonesia</a> </li> <li role="presentation"> <a role="menuitem" lang="it" >Italiano</a> </li> <li role="presentation"> <a role="menuitem" lang="pl" >Polski</a> </li> <li role="presentation"> <a role="menuitem" lang="pt_br" >Português – Brasil</a> </li> <li role="presentation"> <a role="menuitem" lang="vi" >Tiếng Việt</a> </li> <li role="presentation"> <a role="menuitem" lang="tr" >Türkçe</a> </li> <li role="presentation"> <a role="menuitem" lang="ru" >Русский</a> </li> <li role="presentation"> <a role="menuitem" lang="he" >עברית</a> </li> <li role="presentation"> <a role="menuitem" lang="ar" >العربيّة</a> </li> <li role="presentation"> <a role="menuitem" lang="fa" >فارسی</a> </li> <li role="presentation"> <a role="menuitem" lang="hi" >हिंदी</a> </li> <li role="presentation"> <a role="menuitem" lang="bn" >বাংলা</a> </li> <li role="presentation"> <a role="menuitem" lang="th" >ภาษาไทย</a> </li> <li role="presentation"> <a role="menuitem" lang="zh_cn" >中文 – 简体</a> </li> <li role="presentation"> <a role="menuitem" lang="zh_tw" >中文 – 繁體</a> </li> <li role="presentation"> <a role="menuitem" lang="ja" >日本語</a> </li> <li role="presentation"> <a role="menuitem" lang="ko" >한국어</a> </li> </ul> </devsite-language-selector> <devsite-user enable-profiles fp-auth id="devsite-user"> <span class="button devsite-top-button" aria-hidden="true" visually-hidden>Sign in</span> </devsite-user> </div> </div> </div> <div class="devsite-collapsible-section "> <div class="devsite-header-background"> <div class="devsite-product-id-row" > <div class="devsite-product-description-row"> <ul class="devsite-breadcrumb-list" > <li class="devsite-breadcrumb-item "> <a href="https://developers.google.com/identity/credential-verification" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Lower Header" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail="Credential Verification" > Credential Verification </a> </li> </ul> </div> </div> <div class="devsite-doc-set-nav-row"> <devsite-tabs class="lower-tabs"> <nav class="devsite-tabs-wrapper" aria-label="Lower tabs"> <tab class="devsite-active"> <a href="https://developers.google.com/identity/sms-retriever/choose-an-api" track-metadata-eventdetail="https://developers.google.com/identity/sms-retriever/choose-an-api" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - sms retriever" track-metadata-module="primary nav" aria-label="SMS Retriever, selected" data-category="Site-Wide Custom Events" data-label="Tab: SMS Retriever" track-name="sms retriever" > SMS Retriever </a> </tab> <tab > <a href="https://developers.google.com/identity/phone-number-hint/android" track-metadata-eventdetail="https://developers.google.com/identity/phone-number-hint/android" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - phone number hint" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Phone Number Hint" track-name="phone number hint" > Phone Number Hint </a> </tab> </nav> </devsite-tabs> </div> </div> </div> </div> </devsite-header> <devsite-book-nav scrollbars > <div class="devsite-book-nav-filter" > <span class="filter-list-icon material-icons" aria-hidden="true"></span> <input type="text" placeholder="Filter" aria-label="Type to filter" role="searchbox"> <span class="filter-clear-button hidden" data-title="Clear filter" aria-label="Clear filter" role="button" tabindex="0"></span> </div> <nav class="devsite-book-nav devsite-nav nocontent" aria-label="Side menu"> <div class="devsite-mobile-header"> <button type="button" id="devsite-close-nav" class="devsite-header-icon-button button-flat material-icons gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Close navigation" aria-label="Close navigation"> </button> <div class="devsite-product-name-wrapper"> <span class="devsite-product-name"> <ul class="devsite-breadcrumb-list" > <li class="devsite-breadcrumb-item devsite-has-google-wordmark"> <a href="https://developers.google.com/identity" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Upper Header" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail="Google Identity" > <svg class="devsite-google-wordmark" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 148 48"> <title>Google</title> <path class="devsite-google-wordmark-svg-path" d="M19.58,37.65c-9.87,0-18.17-8.04-18.17-17.91c0-9.87,8.3-17.91,18.17-17.91c5.46,0,9.35,2.14,12.27,4.94l-3.45,3.45c-2.1-1.97-4.93-3.49-8.82-3.49c-7.21,0-12.84,5.81-12.84,13.02c0,7.21,5.64,13.02,12.84,13.02c4.67,0,7.34-1.88,9.04-3.58c1.4-1.4,2.32-3.41,2.66-6.16H19.58v-4.89h16.47c0.18,0.87,0.26,1.92,0.26,3.06c0,3.67-1.01,8.21-4.24,11.44C28.93,35.9,24.91,37.65,19.58,37.65z M61.78,26.12c0,6.64-5.1,11.53-11.36,11.53s-11.36-4.89-11.36-11.53c0-6.68,5.1-11.53,11.36-11.53S61.78,19.43,61.78,26.12z M56.8,26.12c0-4.15-2.96-6.99-6.39-6.99c-3.43,0-6.39,2.84-6.39,6.99c0,4.11,2.96,6.99,6.39,6.99C53.84,33.11,56.8,30.22,56.8,26.12z M87.25,26.12c0,6.64-5.1,11.53-11.36,11.53c-6.26,0-11.36-4.89-11.36-11.53c0-6.68,5.1-11.53,11.36-11.53C82.15,14.59,87.25,19.43,87.25,26.12zM82.28,26.12c0-4.15-2.96-6.99-6.39-6.99c-3.43,0-6.39,2.84-6.39,6.99c0,4.11,2.96,6.99,6.39,6.99C79.32,33.11,82.28,30.22,82.28,26.12z M112.09,15.29v20.7c0,8.52-5.02,12.01-10.96,12.01c-5.59,0-8.95-3.76-10.22-6.81l4.41-1.83c0.79,1.88,2.71,4.1,5.81,4.1c3.8,0,6.16-2.36,6.16-6.77v-1.66h-0.18c-1.14,1.4-3.32,2.62-6.07,2.62c-5.76,0-11.05-5.02-11.05-11.49c0-6.51,5.28-11.57,11.05-11.57c2.75,0,4.93,1.22,6.07,2.58h0.18v-1.88H112.09z M107.64,26.16c0-4.06-2.71-7.03-6.16-7.03c-3.49,0-6.42,2.97-6.42,7.03c0,4.02,2.93,6.94,6.42,6.94C104.93,33.11,107.64,30.18,107.64,26.16z M120.97,3.06v33.89h-5.07V3.06H120.97z M140.89,29.92l3.93,2.62c-1.27,1.88-4.32,5.11-9.61,5.11c-6.55,0-11.28-5.07-11.28-11.53c0-6.86,4.77-11.53,10.71-11.53c5.98,0,8.91,4.76,9.87,7.34l0.52,1.31l-15.42,6.38c1.18,2.31,3.01,3.49,5.59,3.49C137.79,33.11,139.58,31.84,140.89,29.92zM128.79,25.77l10.31-4.28c-0.57-1.44-2.27-2.45-4.28-2.45C132.24,19.04,128.66,21.31,128.79,25.77z"/> </svg>Identity </a> </li> </ul> </span> </div> </div> <div class="devsite-book-nav-wrapper"> <div class="devsite-mobile-nav-top"> <ul class="devsite-nav-list"> <li class="devsite-nav-item"> <a href="/identity/authentication" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Authentication" track-name="authentication" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Authentication" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Authentication </span> </a> <ul class="devsite-nav-responsive-tabs devsite-nav-has-menu "> <li class="devsite-nav-item"> <span class="devsite-nav-title" tooltip data-category="Site-Wide Custom Events" data-label="Tab: Authentication" track-name="authentication" > <span class="devsite-nav-text" tooltip menu="Authentication"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Authentication"> </span> </span> </li> </ul> </li> <li class="devsite-nav-item"> <a href="/identity/authorization" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Authorization" track-name="authorization" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Authorization" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Authorization </span> </a> <ul class="devsite-nav-responsive-tabs devsite-nav-has-menu "> <li class="devsite-nav-item"> <span class="devsite-nav-title" tooltip data-category="Site-Wide Custom Events" data-label="Tab: Authorization" track-name="authorization" > <span class="devsite-nav-text" tooltip menu="Authorization"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Authorization"> </span> </span> </li> </ul> </li> <li class="devsite-nav-item"> <a href="/identity/credential-management" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Credential management" track-name="credential management" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Credential management" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Credential management </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> <ul class="devsite-nav-responsive-tabs devsite-nav-has-menu "> <li class="devsite-nav-item"> <span class="devsite-nav-title" tooltip data-category="Site-Wide Custom Events" data-label="Tab: Credential management" track-name="credential management" > <span class="devsite-nav-text" tooltip menu="Credential management"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Credential management"> </span> </span> </li> </ul> </li> <li class="devsite-nav-item"> <a href="/identity/credential-verification" class="devsite-nav-title gc-analytics-event devsite-nav-active" data-category="Site-Wide Custom Events" data-label="Tab: Credential verification" track-name="credential verification" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Credential verification" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Credential verification </span> </a> <ul class="devsite-nav-responsive-tabs devsite-nav-has-menu "> <li class="devsite-nav-item"> <span class="devsite-nav-title" tooltip data-category="Site-Wide Custom Events" data-label="Tab: Credential verification" track-name="credential verification" > <span class="devsite-nav-text" tooltip menu="Credential verification"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Credential verification"> </span> </span> </li> </ul> <ul class="devsite-nav-responsive-tabs"> <li class="devsite-nav-item"> <a href="/identity/sms-retriever/choose-an-api" class="devsite-nav-title gc-analytics-event devsite-nav-has-children devsite-nav-active" data-category="Site-Wide Custom Events" data-label="Tab: SMS Retriever" track-name="sms retriever" data-category="Site-Wide Custom Events" data-label="Responsive Tab: SMS Retriever" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip menu="_book"> SMS Retriever </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="_book"> </span> </a> </li> <li class="devsite-nav-item"> <a href="/identity/phone-number-hint/android" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Phone Number Hint" track-name="phone number hint" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Phone Number Hint" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Phone Number Hint </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> </ul> </li> </ul> </div> <div class="devsite-mobile-nav-bottom"> <ul class="devsite-nav-list" menu="_book"> <li class="devsite-nav-item devsite-nav-heading"><div class="devsite-nav-title devsite-nav-title-no-path"> <span class="devsite-nav-text" tooltip>Verify users by SMS</span> </div></li> <li class="devsite-nav-item"><a href="/identity/sms-retriever/choose-an-api" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sms-retriever/choose-an-api" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sms-retriever/choose-an-api" ><span class="devsite-nav-text" tooltip>Which API should I use?</span></a></li> <li class="devsite-nav-item"><a href="/identity/sms-retriever/overview" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sms-retriever/overview" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sms-retriever/overview" ><span class="devsite-nav-text" tooltip>Automatic SMS verification</span></a></li> <li class="devsite-nav-item"><a href="/identity/sms-retriever/request" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sms-retriever/request" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sms-retriever/request" ><span class="devsite-nav-text" tooltip>Request SMS verification in Android</span></a></li> <li class="devsite-nav-item"><a href="/identity/sms-retriever/verify" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sms-retriever/verify" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sms-retriever/verify" ><span class="devsite-nav-text" tooltip>Perform SMS verification on the server</span></a></li> <li class="devsite-nav-item"><a href="/identity/sms-retriever/user-consent/overview" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sms-retriever/user-consent/overview" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sms-retriever/user-consent/overview" ><span class="devsite-nav-text" tooltip>One-tap SMS verification</span></a></li> <li class="devsite-nav-item"><a href="/identity/sms-retriever/user-consent/request" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /identity/sms-retriever/user-consent/request" track-type="bookNav" track-name="click" track-metadata-eventdetail="/identity/sms-retriever/user-consent/request" ><span class="devsite-nav-text" tooltip>Request one-time consent to read an SMS verification code</span></a></li> </ul> <ul class="devsite-nav-list" menu="Authentication" aria-label="Side menu" hidden> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Sign In with Google SDKs </span> </span> </li> <li class="devsite-nav-item"> <a href="/identity/android-credential-manager" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Credential Manager for Android" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Credential Manager for Android </span> </a> </li> <li class="devsite-nav-item"> <a href="/identity/gsi/web/guides/overview" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Sign In with Google for Web (including One Tap)" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Sign In with Google for Web (including One Tap) </span> </a> </li> <li class="devsite-nav-item"> <a href="/identity/sign-in/ios/start" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Google Sign-In for iOS and macOS" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Google Sign-In for iOS and macOS </span> </a> </li> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Industry standards </span> </span> </li> <li class="devsite-nav-item"> <a href="/identity/passkeys" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Passkeys" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Passkeys </span> </a> </li> <li class="devsite-nav-item"> <a href="/identity/openid-connect/openid-connect" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: OpenID Connect" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > OpenID Connect </span> </a> </li> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Legacy Sign In </span> </span> </li> <li class="devsite-nav-item"> <a href="/identity/one-tap/android/overview" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: One Tap sign-up/sign-in for Android" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > One Tap sign-up/sign-in for Android </span> </a> </li> <li class="devsite-nav-item"> <a href="/identity/sign-in/android/legacy-start-integrating" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Google Sign-In for Android" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Google Sign-In for Android </span> </a> </li> <li class="devsite-nav-item"> <a href="/identity/sign-in/web/sign-in" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Google Sign-In for Web" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Google Sign-In for Web </span> </a> </li> </ul> <ul class="devsite-nav-list" menu="Authorization" aria-label="Side menu" hidden> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" 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data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="5" track-type="globalNav" track-name="breadcrumb" track-metadata-position="5" track-metadata-eventdetail="" > SMS Retriever </a> </li> </ul> <devsite-thumb-rating position="header"> </devsite-thumb-rating> </div> <devsite-feedback position="header" project-name="Credential Verification" product-id="5186570" bucket="Identity guides" context="External devsite feedback" version="t-devsite-webserver-20241114-r00-rc02.464922260396498922" data-label="Send Feedback Button" track-type="feedback" track-name="sendFeedbackLink" track-metadata-position="header" class="nocontent" project-icon="https://www.gstatic.com/devrel-devsite/prod/v870e399c64f7c43c99a3043db4b3a74327bb93d0914e84a0c3dba90bbfd67625/developers/images/touchicon-180-new.png" > <button> Send feedback </button> </devsite-feedback> <h1 class="devsite-page-title" tabindex="-1"> Perform SMS Verification on a Server </h1> <devsite-feature-tooltip ack-key="AckCollectionsBookmarkTooltipDismiss" analytics-category="Site-Wide Custom Events" analytics-action-show="Callout Profile displayed" analytics-action-close="Callout Profile dismissed" analytics-label="Create Collection Callout" class="devsite-page-bookmark-tooltip nocontent" dismiss-button="true" id="devsite-collections-dropdown" dismiss-button-text="Dismiss" close-button-text="Got it"> <devsite-bookmark></devsite-bookmark> <span slot="popout-heading"> Stay organized with collections </span> <span slot="popout-contents"> Save and categorize content based on your preferences. </span> </devsite-feature-tooltip> <div class="devsite-page-title-meta"><devsite-view-release-notes></devsite-view-release-notes></div> <devsite-toc class="devsite-nav" depth="2" devsite-toc-embedded > </devsite-toc> <div class="devsite-article-body clearfix "> <p>To automatically verify phone numbers, you must implement both the client and server portions of the verification flow. This document describes how to implement the server portion.</p> <p>The phone verification server is responsible for three tasks:</p> <ol> <li>Constructing a verification message that includes a one-time code and has the format the client-side SMS Retriever API expects</li> <li>Sending the verification message to to the user's device</li> <li>Verifying the one-time code when it's sent back to the server and completing any post-verification tasks your backend requires</li> </ol> <p>The specifics of how your app interacts with the server are up to you. A common approach is to expose a REST API with two endpoints: one that receives requests to verify a given phone number and sends the SMS verification messages, and a second endpoint that receives one-time codes from your app.</p> <h2 id="1_construct_a_verification_message" data-text="1. Construct a verification message" tabindex="-1">1. Construct a verification message</h2> <p>When your server receives a request to verify a phone number, first construct the verification message that you will send to the user's device. This message must:</p> <ul> <li>Be no longer than 140 bytes</li> <li>Contain a one-time code that the client sends back to your server to complete the verification flow (see <a href="#generating_a_one-time_code">Generating a one-time code</a>)</li> <li>Include an 11-character hash string that identifies your app (see <a href="#computing_your_apps_hash_string">Computing your app's hash string</a>)</li> </ul> <p>Otherwise, the contents of the verification message can be whatever you choose. It is helpful to create a message from which you can easily extract the one-time code later on. For example, a valid verification message might look like the following: <pre translate="no" dir="ltr"> Your ExampleApp code is: 123ABC78</p> <p>FA+9qCX9VSu </pre></p> <h3 id="generating_a_one-time_code" data-text="Generating a one-time code" tabindex="-1">Generating a one-time code</h3> <p>You can implement one-time codes in many ways, as long as the codes are unguessable and you can link the codes to a user or phone number when the client app sends them back to your server. You should make the codes easy to type, to accommodate any situations which might require users to manually type the code.</p> <p>One way to implement one-time codes is to generate random numbers, which you use as keys in a database table. For example, you might have a PendingVerifications table like the following:</p> <table> <thead> <tr> <th>ID</th> <th>User</th> <th>Expiration</th> </tr> </thead> <tbody> <tr> <td>123456789...</td> <td>1234</td> <td>2017-3-14 1:59</td> </tr> </tbody> </table> <p>You can use the base32-encoded ID as a one-time code.</p> <h3 id="computing_your_apps_hash_string" data-text="Computing your app's hash string" tabindex="-1">Computing your app's hash string</h3> <p>Google Play services uses the hash string to determine which verification messages to send to your app. The hash string is made of your app's package name and your app's public key certificate. To generate the hash string:</p> <ol> <li><p>If you use <a href="https://support.google.com/googleplay/android-developer/answer/7384423">app signing by Google Play</a>, download your app signing certificate (<code translate="no" dir="ltr">deployment_cert.der</code>) from the <strong>App signing</strong> section of the <a href="https://play.google.com/apps/publish/">Google Play console</a>.</p> <p>Then, import the app signing certificate into a temporary key store: <pre class="devsite-terminal devsite-click-to-copy" translate="no" dir="ltr"> keytool -importcert -file deployment_cert.der -keystore temporary.keystore -alias PlayDeploymentCert </pre></p> <p>If you sign your APKs directly, skip this step.</p></li> <li><p>Get your app signing certificate—either the one you imported above or the one you use to sign your APKs directly—as a lower-case hex string.</p> <p>For example, to get the hex string from the temporary keystore created above, type the following command: <pre class="devsite-terminal devsite-click-to-copy" translate="no" dir="ltr"> keytool -exportcert -keystore temporary.keystore -alias PlayDeploymentCert | xxd -p | tr -d "[:space:]" </pre></p> <p>If you sign your APKs directly, specify your production keystore and certificate alias.</p></li> <li><p>If you created a temporary keystore, delete it.</p></li> <li><p>Append the hex string to your app's package name, separated by a single space.</p></li> <li><p>Compute the SHA-256 sum of the combined string. Be sure to remove any leading or trailing whitespace from the string before computing the SHA-256 sum.</p></li> <li><p>Base64-encode the binary value of the SHA-256 sum. You might need to decode the SHA-256 sum from its output format first.</p></li> <li><p>Your app's hash string is the first 11 characters of the base64-encoded hash.</p></li> </ol> <p>The following command computes the hash string from your app's production keystore:</p> <pre class="devsite-terminal devsite-click-to-copy" translate="no" dir="ltr"> keytool -exportcert -alias PlayDeploymentCert -keystore MyProductionKeys.keystore | xxd -p | tr -d "[:space:]" | echo -n com.example.myapp `cat` | sha256sum | tr -d "[:space:]-" | xxd -r -p | base64 | cut -c1-11 </pre> <aside class="note"><strong>Note:</strong><span> This command does not emit an error if the <code translate="no" dir="ltr">keytool</code> command fails (for example, because the alias does not exist within the keystore). Before you run the entire pipeline, try running the <code translate="no" dir="ltr">keytool</code> command by itself to ensure it's producing meaningful output.</span></aside> <p>Alternatively, you can get your app's hash string with the <a href="https://github.com/googlesamples/android-credentials/blob/master/sms-verification/android/app/src/main/java/com/google/samples/smartlock/sms_verify/AppSignatureHelper.java">AppSignatureHelper</a> class from the SMS retriever sample app. However, if you use the helper class, be sure to remove it from your app after you get the hash string. <strong>Do not use hash strings dynamically computed on the client in your verification messages.</strong></p> <h2 id="2_send_the_verification_message_by_sms" data-text="2. Send the verification message by SMS" tabindex="-1">2. Send the verification message by SMS</h2> <p>After you construct the verification message, send the message to the user's phone number using any SMS system.</p> <p>For example, see <a href="https://www.twilio.com/docs/api/rest/app-verification-using-twilio-sms">App verification using Twilio SMS</a> on Twilio's developer site.</p> <aside class="special"><strong>Important:</strong><span> Don't send the one-time code or verification message back to the user's device through any channel other than SMS. In particular, don't return the one-time code in response the verification request for the purpose of client-side verification. You must generate and verify one-time codes only on the server.</span></aside> <p>When the user's device receives this message, the message is directed to your app. Your app extracts the one-time code and sends it back to your server to complete the verification process.</p> <h2 id="3_verify_the_one-time_code_when_its_returned" data-text="3. Verify the one-time code when it's returned" tabindex="-1">3. Verify the one-time code when it's returned</h2> <p>A phone number verification server typically has a second endpoint that it uses to receive one-time codes back from client apps. 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