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data-paste-core-version="21.4.0" href="/docs/usage/api/applications" class="css-lafmnu"><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-qxhhlx">Applications</span></a><div data-paste-element="SIDEBAR_NAVIGATION_DISCLOSURE" data-paste-core-version="21.4.0" class="css-17onuso"><div data-paste-element="SIDEBAR_NAVIGATION_DISCLOSURE_HEADING_WRAPPER" data-paste-core-version="21.4.0" class="css-1icrb9o"><div data-paste-element="SIDEBAR_NAVIGATION_DISCLOSURE_HEADING" data-paste-core-version="21.4.0" type="button" aria-expanded="false" aria-controls="_R_2ladalb9lbkm_" class="css-q9if6j"><span data-paste-element="SIDEBAR_NAVIGATION_DISCLOSURE_HEADING_EXPAND_ICON" data-paste-core-version="21.4.0" class="css-f76d15"><span data-paste-element="ICON" data-paste-core-version="21.4.0" class="css-pft8gl"><svg role="img" aria-hidden="true" width="100%" height="100%" viewBox="0 0 20 20" fill="none" aria-labelledby="ChevronDisclosureIcon-_R_j9mladalb9lbkm_"><path 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class="css-pft8gl"><svg role="img" aria-hidden="true" width="100%" height="100%" viewBox="0 0 20 20" fill="none" aria-labelledby="ChevronDisclosureIcon-_R_j9nladalb9lbkm_"><path fill="currentColor" fill-rule="evenodd" clip-rule="evenodd" d="M9.707 6.293a1 1 0 00-1.497 1.32l.083.094L10.585 10l-2.292 2.293a1 1 0 00-.083 1.32l.083.094a1 1 0 001.32.083l.094-.083 3-3a1 1 0 00.083-1.32l-.083-.094-3-3z"></path></svg></span></span><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-1m2bqrv">Monitor REST API</span></div></div><div data-paste-element="SIDEBAR_NAVIGATION_DISCLOSURE_CONTENT" data-paste-core-version="21.4.0" id="_R_3ladalb9lbkm_" hidden="" style="display:none" class="css-1nm6rmy"><a data-paste-element="SIDEBAR_NAVIGATION_ITEM" data-paste-core-version="21.4.0" href="/docs/usage/monitor-alert" class="css-lafmnu"><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-qxhhlx">Alerts</span></a><a data-paste-element="SIDEBAR_NAVIGATION_ITEM" 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aria-labelledby="ChevronDisclosureIcon-_R_9kqhalb9lbkm_"><path fill="currentColor" fill-rule="evenodd" clip-rule="evenodd" d="M9.707 6.293a1 1 0 00-1.497 1.32l.083.094L10.585 10l-2.292 2.293a1 1 0 00-.083 1.32l.083.094a1 1 0 001.32.083l.094-.083 3-3a1 1 0 00.083-1.32l-.083-.094-3-3z"></path></svg></span></span><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-1m2bqrv">Webhooks</span></div></div><div data-paste-element="SIDEBAR_NAVIGATION_DISCLOSURE_CONTENT" data-paste-core-version="21.4.0" id="_R_halb9lbkm_" hidden="" style="display:none" class="css-1nm6rmy"><a data-paste-element="SIDEBAR_NAVIGATION_ITEM" data-paste-core-version="21.4.0" href="/docs/usage/webhooks" class="css-lafmnu"><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-qxhhlx">Introduction</span></a><a data-paste-element="SIDEBAR_NAVIGATION_ITEM" data-paste-core-version="21.4.0" href="/docs/usage/webhooks/webhooks-overview" class="css-lafmnu"><span data-paste-element="BOX" 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href="/docs/usage/global-safe-list" class="css-lafmnu"><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-qxhhlx">Global Safe List API</span></a></div></div><div data-paste-element="SIDEBAR_NAVIGATION_DISCLOSURE" data-paste-core-version="21.4.0" class="css-17onuso"><div data-paste-element="SIDEBAR_NAVIGATION_DISCLOSURE_HEADING_WRAPPER" data-paste-core-version="21.4.0" class="css-1icrb9o"><div data-paste-element="SIDEBAR_NAVIGATION_DISCLOSURE_HEADING" data-paste-core-version="21.4.0" type="button" aria-expanded="false" aria-controls="_R_palb9lbkm_" class="css-1vx51jp"><span data-paste-element="SIDEBAR_NAVIGATION_DISCLOSURE_HEADING_EXPAND_ICON" data-paste-core-version="21.4.0" class="css-f76d15"><span data-paste-element="ICON" data-paste-core-version="21.4.0" class="css-pft8gl"><svg role="img" aria-hidden="true" width="100%" height="100%" viewBox="0 0 20 20" fill="none" aria-labelledby="ChevronDisclosureIcon-_R_9kqpalb9lbkm_"><path fill="currentColor" fill-rule="evenodd" clip-rule="evenodd" d="M9.707 6.293a1 1 0 00-1.497 1.32l.083.094L10.585 10l-2.292 2.293a1 1 0 00-.083 1.32l.083.094a1 1 0 001.32.083l.094-.083 3-3a1 1 0 00.083-1.32l-.083-.094-3-3z"></path></svg></span></span><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-1m2bqrv">Troubleshooting and Security</span></div></div><div data-paste-element="SIDEBAR_NAVIGATION_DISCLOSURE_CONTENT" data-paste-core-version="21.4.0" id="_R_palb9lbkm_" hidden="" style="display:none" class="css-1nm6rmy"><a data-paste-element="SIDEBAR_NAVIGATION_ITEM" data-paste-core-version="21.4.0" href="/docs/usage/troubleshooting/debugging-your-application" class="css-lafmnu"><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-qxhhlx">Twilio Debugger</span></a><a data-paste-element="SIDEBAR_NAVIGATION_ITEM" data-paste-core-version="21.4.0" href="/docs/usage/troubleshooting/debugging-event-webhooks" class="css-lafmnu"><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-qxhhlx">Debug events webhooks</span></a><a data-paste-element="SIDEBAR_NAVIGATION_ITEM" data-paste-core-version="21.4.0" href="/docs/usage/troubleshooting/alarms" class="css-lafmnu"><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-qxhhlx">Alarms</span></a><a data-paste-element="SIDEBAR_NAVIGATION_ITEM" data-paste-core-version="21.4.0" href="/docs/usage/security/availability-reliability" class="css-lafmnu"><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-qxhhlx">Availability and Reliability</span></a><a data-paste-element="SIDEBAR_NAVIGATION_ITEM" data-paste-core-version="21.4.0" href="/docs/usage/security" class="css-lafmnu"><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-qxhhlx">Security</span></a><a data-paste-element="SIDEBAR_NAVIGATION_ITEM" data-paste-core-version="21.4.0" href="/docs/usage/security/iso-iec-certification" class="css-lafmnu"><span 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type="button" aria-expanded="false" aria-controls="_R_2dapalb9lbkm_" class="css-q9if6j"><span data-paste-element="SIDEBAR_NAVIGATION_DISCLOSURE_HEADING_EXPAND_ICON" data-paste-core-version="21.4.0" class="css-f76d15"><span data-paste-element="ICON" data-paste-core-version="21.4.0" class="css-pft8gl"><svg role="img" aria-hidden="true" width="100%" height="100%" viewBox="0 0 20 20" fill="none" aria-labelledby="ChevronDisclosureIcon-_R_j9mdapalb9lbkm_"><path fill="currentColor" fill-rule="evenodd" clip-rule="evenodd" d="M9.707 6.293a1 1 0 00-1.497 1.32l.083.094L10.585 10l-2.292 2.293a1 1 0 00-.083 1.32l.083.094a1 1 0 001.32.083l.094-.083 3-3a1 1 0 00.083-1.32l-.083-.094-3-3z"></path></svg></span></span><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-1m2bqrv">Secure your app by validating incoming Twilio requests</span></div></div><div data-paste-element="SIDEBAR_NAVIGATION_DISCLOSURE_CONTENT" data-paste-core-version="21.4.0" id="_R_2dapalb9lbkm_" hidden="" style="display:none" class="css-1nm6rmy"><a data-paste-element="SIDEBAR_NAVIGATION_ITEM" data-paste-core-version="21.4.0" href="/docs/usage/tutorials/how-to-secure-your-csharp-aspnet-app-by-validating-incoming-twilio-requests" class="css-lafmnu"><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-qxhhlx">C# / ASP.NET</span></a><a data-paste-element="SIDEBAR_NAVIGATION_ITEM" data-paste-core-version="21.4.0" href="/docs/usage/tutorials/how-to-secure-your-csharp-aspnet-core-app-by-validating-incoming-twilio-requests" class="css-lafmnu"><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-qxhhlx">C# / ASP.NET Core</span></a><a data-paste-element="SIDEBAR_NAVIGATION_ITEM" data-paste-core-version="21.4.0" href="/docs/usage/tutorials/how-to-secure-your-csharp-aspnet-web-api-app-by-validating-incoming-twilio-requests" class="css-lafmnu"><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-qxhhlx">C# / ASP.NET WEB API</span></a><a data-paste-element="SIDEBAR_NAVIGATION_ITEM" data-paste-core-version="21.4.0" href="/docs/usage/tutorials/how-to-secure-your-servlet-app-by-validating-incoming-twilio-requests" class="css-lafmnu"><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-qxhhlx">Java / Servlets</span></a><a data-paste-element="SIDEBAR_NAVIGATION_ITEM" data-paste-core-version="21.4.0" href="/docs/usage/tutorials/how-to-secure-your-express-app-by-validating-incoming-twilio-requests" class="css-lafmnu"><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-qxhhlx">Node.js / Express</span></a><a data-paste-element="SIDEBAR_NAVIGATION_ITEM" data-paste-core-version="21.4.0" href="/docs/usage/tutorials/how-to-secure-your-lumen-app-by-validating-incoming-twilio-requests" class="css-lafmnu"><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-qxhhlx">PHP / Lumen</span></a><a data-paste-element="SIDEBAR_NAVIGATION_ITEM" data-paste-core-version="21.4.0" href="/docs/usage/tutorials/how-to-secure-your-django-project-by-validating-incoming-twilio-requests" class="css-lafmnu"><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-qxhhlx">Python / Django</span></a><a data-paste-element="SIDEBAR_NAVIGATION_ITEM" data-paste-core-version="21.4.0" href="/docs/usage/tutorials/how-to-secure-your-flask-app-by-validating-incoming-twilio-requests" class="css-lafmnu"><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-qxhhlx">Python / Flask</span></a><a data-paste-element="SIDEBAR_NAVIGATION_ITEM" data-paste-core-version="21.4.0" href="/blog/secure-your-sinatra-app-validating-incoming-twilio-requests" class="css-lafmnu"><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-qxhhlx">Ruby / Sinatra<span data-paste-element="ICON" data-paste-core-version="21.4.0" class="css-pe4vrq"><svg role="img" aria-hidden="true" xmlns="http://www.w3.org/2000/svg" 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class="css-roynbj"><style data-emotion="css m8ey6p">.css-m8ey6p{box-sizing:border-box;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-pack:justify;-webkit-justify-content:space-between;justify-content:space-between;-webkit-align-items:baseline;-webkit-box-align:baseline;-ms-flex-align:baseline;align-items:baseline;-webkit-column-gap:0.75rem;column-gap:0.75rem;}</style><div data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-m8ey6p"><div data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-roynbj"><style data-emotion="css 1rsbb0f">.css-1rsbb0f{margin:0;padding:0;color:rgb(18, 28, 45);font-size:2rem;line-height:2.5rem;margin-bottom:1.5rem;font-weight:600;letter-spacing:-.02em;display:block;word-break:break-word;}</style><h1 data-paste-element="HEADING" data-paste-core-version="21.0.1" class="css-1rsbb0f">Twilio API overview</h1></div><style data-emotion="css 7lkj4y">section:focus-within .css-7lkj4y,section:hover 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2.204.417 3.002.883.178.104.345.212.498.321v-.37a.5.5 0 01.5-.5h3a.5.5 0 01.5.5V13a.5.5 0 01-.5.5h-3a.5.5 0 01-.5-.5v-.45zm-3.474 3.227c-.186.554-.611.752-.909.72a.571.571 0 01-.399-.234c-.114-.15-.218-.409-.218-.824a2 2 0 01.123-.61c.054-.16.113-.312.177-.475.034-.086.07-.176.105-.272.095-.252.194-.542.225-.828.032-.296-.005-.635-.23-.934a1.23 1.23 0 00-.491-.367 2.874 2.874 0 00-.571-.176 8.31 8.31 0 00-1.317-.144c-.676-.029-1.381-.008-1.767.003-.118.003-.206.006-.254.006-.25 0-.519-.018-.717-.115a.452.452 0 01-.194-.168c-.044-.07-.089-.19-.089-.396 0-1.04.476-3.316 1.447-5.247.184-.366.375-.515.82-.796.468-.296.855-.42 1.233-.42h3c.884 0 1.796.337 2.498.747.349.203.628.414.813.59.093.09.152.16.184.208l.005.007v4.98a7.245 7.245 0 01-.329.39 54.1 54.1 0 01-.308.342c-.223.247-.483.534-.746.838-.788.909-1.73 2.096-2.091 3.175zM14.5 12.5h2V4.833h-2V12.5z"></path></svg></span></span></button></div></div></div><style data-emotion="css 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Behind these APIs is a software layer connecting and optimizing communications networks around the world. With the Twilio APIs, you can build applications that help your users send messages, make phone calls, look up phone numbers, and more.</p>
<p data-paste-element="PARAGRAPH" data-paste-core-version="21.0.1" class="css-t3ja6c">In Twilio&#x27;s ecosystem, each product corresponds to an API. For example, Twilio Messaging corresponds to the Messaging API. Although each API has its own unique features, they all share a common set of principles and practices. This consistency lets you work with different Twilio APIs in a similar way. You can use the APIs directly over HTTPS or through <a data-paste-element="ANCHOR" data-paste-core-version="21.4.0" href="/docs/libraries" title="Twilio SDKs" class="css-lpeit6">Twilio SDKs</a> available for several programming languages.</p>
<p data-paste-element="PARAGRAPH" data-paste-core-version="21.0.1" class="css-t3ja6c">This section covers how to work with the Twilio APIs:</p>
<style data-emotion="css q56x2v">.css-q56x2v{margin:0;padding:0;color:rgb(18, 28, 45);font-size:0.875rem;line-height:1.5rem;margin-bottom:1.5rem;font-weight:400;margin-left:1.5rem;}</style><ul data-paste-element="UNORDERED_LIST" data-paste-core-version="21.0.1" class="css-q56x2v">
<style data-emotion="css 1pp5a8v">.css-1pp5a8v{margin:0;padding:0;color:rgb(18, 28, 45);font-size:0.875rem;line-height:1.5rem;font-weight:400;margin-bottom:0.5rem;margin-top:0.5rem;}</style><li data-paste-element="LIST_ITEM" data-paste-core-version="21.0.1" class="css-1pp5a8v"><a data-paste-element="ANCHOR" data-paste-core-version="21.4.0" href="/docs/usage/requests-to-twilio" title="Make requests to the Twilio APIs" class="css-lpeit6">Make requests to the Twilio APIs</a>, including authenticating your requests, choosing the right content type, and handling webhooks.</li>
<li data-paste-element="LIST_ITEM" data-paste-core-version="21.0.1" class="css-1pp5a8v"><a data-paste-element="ANCHOR" data-paste-core-version="21.4.0" href="/docs/usage/twilios-response" title="Work with Twilio API responses" class="css-lpeit6">Work with Twilio API responses</a>, including specifying response formats, paginating results, and handling errors.</li>
<li data-paste-element="LIST_ITEM" data-paste-core-version="21.0.1" class="css-1pp5a8v"><a data-paste-element="ANCHOR" data-paste-core-version="21.4.0" href="/docs/usage/mutation-and-conflict-resolution" title="Handle mutations and conflicts" class="css-lpeit6">Handle mutations and conflicts</a>.</li>
<li data-paste-element="LIST_ITEM" data-paste-core-version="21.0.1" class="css-1pp5a8v"><a data-paste-element="ANCHOR" data-paste-core-version="21.4.0" href="/docs/usage/rest-api-best-practices" title="Follow API best practices" class="css-lpeit6">Follow API best practices</a>.</li>
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Get help now from our <style data-emotion="css 1az6u6g">.css-1az6u6g{box-sizing:border-box;color:rgb(255, 255, 255);font-size:inherit;font-weight:inherit;line-height:inherit;outline:none;-webkit-text-decoration:underline;text-decoration:underline;}.css-1az6u6g:active,.css-1az6u6g[data-active=true]{color:rgb(255, 255, 255);-webkit-text-decoration:none;text-decoration:none;}.css-1az6u6g:focus{box-shadow:0 0 0 1px #394762,0 0 0 3px #121c2d,0 0 0 4px #ffffff,0 0 0 6px rgba(255, 255, 255, 0.2);color:rgb(255, 255, 255);-webkit-text-decoration:underline;text-decoration:underline;border-radius:4px;}.css-1az6u6g:hover{color:rgb(255, 255, 255);-webkit-text-decoration:none;text-decoration:none;}</style><a data-paste-element="ANCHOR" data-paste-core-version="21.4.0" href="https://help.twilio.com" rel="noreferrer noopener" target="_blank" title="support team" class="css-1az6u6g"><span data-paste-element="BOX" data-paste-core-version="21.4.0" class="css-roynbj">support team<style data-emotion="css 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