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+
+                        <h1 id="registration-tokens"><a class="header" href="#registration-tokens">Registration Tokens</a></h1>
+<p><strong>Note:</strong> This API is disabled when MSC3861 is enabled. <a href="https://github.com/matrix-org/synapse/pull/15582">See #15582</a></p>
+<p>This API allows you to manage tokens which can be used to authenticate
+registration requests, as proposed in
+<a href="https://github.com/matrix-org/matrix-doc/blob/main/proposals/3231-token-authenticated-registration.md">MSC3231</a>
+and stabilised in version 1.2 of the Matrix specification.
+To use it, you will need to enable the <code>registration_requires_token</code> config
+option, and authenticate by providing an <code>access_token</code> for a server admin:
+see <a href="../admin_api/">Admin API</a>.</p>
+<h2 id="registration-token-objects"><a class="header" href="#registration-token-objects">Registration token objects</a></h2>
+<p>Most endpoints make use of JSON objects that contain details about tokens.
+These objects have the following fields:</p>
+<ul>
+<li><code>token</code>: The token which can be used to authenticate registration.</li>
+<li><code>uses_allowed</code>: The number of times the token can be used to complete a
+registration before it becomes invalid.</li>
+<li><code>pending</code>: The number of pending uses the token has. When someone uses
+the token to authenticate themselves, the pending counter is incremented
+so that the token is not used more than the permitted number of times.
+When the person completes registration the pending counter is decremented,
+and the completed counter is incremented.</li>
+<li><code>completed</code>: The number of times the token has been used to successfully
+complete a registration.</li>
+<li><code>expiry_time</code>: The latest time the token is valid. Given as the number of
+milliseconds since 1970-01-01 00:00:00 UTC (the start of the Unix epoch).
+To convert this into a human-readable form you can remove the milliseconds
+and use the <code>date</code> command. For example, <code>date -d '@1625394937'</code>.</li>
+</ul>
+<h2 id="list-all-tokens"><a class="header" href="#list-all-tokens">List all tokens</a></h2>
+<p>Lists all tokens and details about them. If the request is successful, the top
+level JSON object will have a <code>registration_tokens</code> key which is an array of
+registration token objects.</p>
+<pre><code>GET /_synapse/admin/v1/registration_tokens
+</code></pre>
+<p>Optional query parameters:</p>
+<ul>
+<li><code>valid</code>: <code>true</code> or <code>false</code>. If <code>true</code>, only valid tokens are returned.
+If <code>false</code>, only tokens that have expired or have had all uses exhausted are
+returned. If omitted, all tokens are returned regardless of validity.</li>
+</ul>
+<p>Example:</p>
+<pre><code>GET /_synapse/admin/v1/registration_tokens
+</code></pre>
+<pre><code>200 OK
+
+{
+    &quot;registration_tokens&quot;: [
+        {
+            &quot;token&quot;: &quot;abcd&quot;,
+            &quot;uses_allowed&quot;: 3,
+            &quot;pending&quot;: 0,
+            &quot;completed&quot;: 1,
+            &quot;expiry_time&quot;: null
+        },
+        {
+            &quot;token&quot;: &quot;pqrs&quot;,
+            &quot;uses_allowed&quot;: 2,
+            &quot;pending&quot;: 1,
+            &quot;completed&quot;: 1,
+            &quot;expiry_time&quot;: null
+        },
+        {
+            &quot;token&quot;: &quot;wxyz&quot;,
+            &quot;uses_allowed&quot;: null,
+            &quot;pending&quot;: 0,
+            &quot;completed&quot;: 9,
+            &quot;expiry_time&quot;: 1625394937000    // 2021-07-04 10:35:37 UTC
+        }
+    ]
+}
+</code></pre>
+<p>Example using the <code>valid</code> query parameter:</p>
+<pre><code>GET /_synapse/admin/v1/registration_tokens?valid=false
+</code></pre>
+<pre><code>200 OK
+
+{
+    &quot;registration_tokens&quot;: [
+        {
+            &quot;token&quot;: &quot;pqrs&quot;,
+            &quot;uses_allowed&quot;: 2,
+            &quot;pending&quot;: 1,
+            &quot;completed&quot;: 1,
+            &quot;expiry_time&quot;: null
+        },
+        {
+            &quot;token&quot;: &quot;wxyz&quot;,
+            &quot;uses_allowed&quot;: null,
+            &quot;pending&quot;: 0,
+            &quot;completed&quot;: 9,
+            &quot;expiry_time&quot;: 1625394937000    // 2021-07-04 10:35:37 UTC
+        }
+    ]
+}
+</code></pre>
+<h2 id="get-one-token"><a class="header" href="#get-one-token">Get one token</a></h2>
+<p>Get details about a single token. If the request is successful, the response
+body will be a registration token object.</p>
+<pre><code>GET /_synapse/admin/v1/registration_tokens/&lt;token&gt;
+</code></pre>
+<p>Path parameters:</p>
+<ul>
+<li><code>token</code>: The registration token to return details of.</li>
+</ul>
+<p>Example:</p>
+<pre><code>GET /_synapse/admin/v1/registration_tokens/abcd
+</code></pre>
+<pre><code>200 OK
+
+{
+    &quot;token&quot;: &quot;abcd&quot;,
+    &quot;uses_allowed&quot;: 3,
+    &quot;pending&quot;: 0,
+    &quot;completed&quot;: 1,
+    &quot;expiry_time&quot;: null
+}
+</code></pre>
+<h2 id="create-token"><a class="header" href="#create-token">Create token</a></h2>
+<p>Create a new registration token. If the request is successful, the newly created
+token will be returned as a registration token object in the response body.</p>
+<pre><code>POST /_synapse/admin/v1/registration_tokens/new
+</code></pre>
+<p>The request body must be a JSON object and can contain the following fields:</p>
+<ul>
+<li><code>token</code>: The registration token. A string of no more than 64 characters that
+consists only of characters matched by the regex <code>[A-Za-z0-9._~-]</code>.
+Default: randomly generated.</li>
+<li><code>uses_allowed</code>: The integer number of times the token can be used to complete
+a registration before it becomes invalid.
+Default: <code>null</code> (unlimited uses).</li>
+<li><code>expiry_time</code>: The latest time the token is valid. Given as the number of
+milliseconds since 1970-01-01 00:00:00 UTC (the start of the Unix epoch).
+You could use, for example, <code>date '+%s000' -d 'tomorrow'</code>.
+Default: <code>null</code> (token does not expire).</li>
+<li><code>length</code>: The length of the token randomly generated if <code>token</code> is not
+specified. Must be between 1 and 64 inclusive. Default: <code>16</code>.</li>
+</ul>
+<p>If a field is omitted the default is used.</p>
+<p>Example using defaults:</p>
+<pre><code>POST /_synapse/admin/v1/registration_tokens/new
+
+{}
+</code></pre>
+<pre><code>200 OK
+
+{
+    &quot;token&quot;: &quot;0M-9jbkf2t_Tgiw1&quot;,
+    &quot;uses_allowed&quot;: null,
+    &quot;pending&quot;: 0,
+    &quot;completed&quot;: 0,
+    &quot;expiry_time&quot;: null
+}
+</code></pre>
+<p>Example specifying some fields:</p>
+<pre><code>POST /_synapse/admin/v1/registration_tokens/new
+
+{
+    &quot;token&quot;: &quot;defg&quot;,
+    &quot;uses_allowed&quot;: 1
+}
+</code></pre>
+<pre><code>200 OK
+
+{
+    &quot;token&quot;: &quot;defg&quot;,
+    &quot;uses_allowed&quot;: 1,
+    &quot;pending&quot;: 0,
+    &quot;completed&quot;: 0,
+    &quot;expiry_time&quot;: null
+}
+</code></pre>
+<h2 id="update-token"><a class="header" href="#update-token">Update token</a></h2>
+<p>Update the number of allowed uses or expiry time of a token. If the request is
+successful, the updated token will be returned as a registration token object
+in the response body.</p>
+<pre><code>PUT /_synapse/admin/v1/registration_tokens/&lt;token&gt;
+</code></pre>
+<p>Path parameters:</p>
+<ul>
+<li><code>token</code>: The registration token to update.</li>
+</ul>
+<p>The request body must be a JSON object and can contain the following fields:</p>
+<ul>
+<li><code>uses_allowed</code>: The integer number of times the token can be used to complete
+a registration before it becomes invalid. By setting <code>uses_allowed</code> to <code>0</code>
+the token can be easily made invalid without deleting it.
+If <code>null</code> the token will have an unlimited number of uses.</li>
+<li><code>expiry_time</code>: The latest time the token is valid. Given as the number of
+milliseconds since 1970-01-01 00:00:00 UTC (the start of the Unix epoch).
+If <code>null</code> the token will not expire.</li>
+</ul>
+<p>If a field is omitted its value is not modified.</p>
+<p>Example:</p>
+<pre><code>PUT /_synapse/admin/v1/registration_tokens/defg
+
+{
+    &quot;expiry_time&quot;: 4781243146000    // 2121-07-06 11:05:46 UTC
+}
+</code></pre>
+<pre><code>200 OK
+
+{
+    &quot;token&quot;: &quot;defg&quot;,
+    &quot;uses_allowed&quot;: 1,
+    &quot;pending&quot;: 0,
+    &quot;completed&quot;: 0,
+    &quot;expiry_time&quot;: 4781243146000
+}
+</code></pre>
+<h2 id="delete-token"><a class="header" href="#delete-token">Delete token</a></h2>
+<p>Delete a registration token. If the request is successful, the response body
+will be an empty JSON object.</p>
+<pre><code>DELETE /_synapse/admin/v1/registration_tokens/&lt;token&gt;
+</code></pre>
+<p>Path parameters:</p>
+<ul>
+<li><code>token</code>: The registration token to delete.</li>
+</ul>
+<p>Example:</p>
+<pre><code>DELETE /_synapse/admin/v1/registration_tokens/wxyz
+</code></pre>
+<pre><code>200 OK
+
+{}
+</code></pre>
+<h2 id="errors"><a class="header" href="#errors">Errors</a></h2>
+<p>If a request fails a &quot;standard error response&quot; will be returned as defined in
+the <a href="https://matrix.org/docs/spec/client_server/r0.6.1#api-standards">Matrix Client-Server API specification</a>.</p>
+<p>For example, if the token specified in a path parameter does not exist a
+<code>404 Not Found</code> error will be returned.</p>
+<pre><code>GET /_synapse/admin/v1/registration_tokens/1234
+</code></pre>
+<pre><code>404 Not Found
+
+{
+    &quot;errcode&quot;: &quot;M_NOT_FOUND&quot;,
+    &quot;error&quot;: &quot;No such registration token: 1234&quot;
+}
+</code></pre>
+
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