1 <meta name="doc-family" content="apps">
2 <h1>API Reference for GCM service</h1>
5 This document explains sending messages to chrome.pushMessaging API, which is
6 deprecated since Chrome 38. The API will be removed in Chrome 41.
7 Use the new <a href="cloudMessaging">Google Cloud Messaging</a>.
11 The <a href="cloudMessagingV1">Google Cloud Messaging for Chrome</a> service
12 sends messages to users of a Chrome App.
13 The service handles all aspects of queueing and delivering messages.
16 <a href="gcm_tos">Google Cloud Messaging for Chrome API Terms of Service</a>.
19 <p>Messages must conform to these constraints:</p>
22 <li><strong>Maximum payload length:</strong> 256 bytes</li>
23 <li><strong>Maximum subchannels:</strong> 4</li>
24 <li><strong>Maximum API requests per day:</strong> 10,000</li>
27 <h2 id="libraries">Google API client libraries</h2>
30 You may use the REST interface defined here
31 to access Google Cloud Messaging for Chrome from your application.
32 We also offer Google API client libraries for a number
33 of popular programming languages that can be used to access the API.
34 For more information, see
35 <a href="https://developers.google.com/api-client-library">Google APIs Client Libraries</a>.
38 <h2 id="insert">Insert method</h2>
41 The <code>gcm_for_chrome.messages.insert</code>
42 method sends a message to your app or extension user.
45 <h2 id="authorization">Authentication</h2>
48 Authentication is required to send messages to users.
49 <a href="https://developers.google.com/accounts/docs/OAuth2WebServer">Using OAuth 2.0 for Web Server Applications</a>
50 describes this in greater detail.
56 The URL used to obtain access to the GCM for Chrome service:
57 <code>https://accounts.google.com/o/auth2/auth</code>.
60 <h3 id="parameters">Required parameters</h3>
62 The required set of query string parameters are:
67 <th scope="col">Parameter</th>
68 <th scope="col">Description</th>
71 <td><code>client_id</code></td>
72 <td>Indicates the app or extension client that is making the request.
73 Obtained from the <a href="https://code.google.com/apis/console/">Google APIs Console</a>;
74 the parameter value must exactly match the client ID shown
79 <td><code>client_secret</code></td>
80 <td>The client secret obtained during registration in
81 <a href="https://code.google.com/apis/console/">Google APIs Console</a>.</td>
84 <td><code>refresh_token</code></td>
85 <td>Token associated with app or extension used to obtain new access token.</td>
88 <td><code>grant_type</code></td>
89 <td>The <code>authorization_code</code> value of <code>refresh_token</code>.</td>
93 <h3 id="response">Response</h3>
96 The authorization response includes:
101 <th scope="col">Field</th>
102 <th scope="col">Description</th>
105 <td><code>access_token</code></td>
106 <td>Valid token required to access the GCM for Chrome service.</td>
109 <td><code>expires_in</code></td>
110 <td>Time until access token expires in seconds.</td>
113 <td><code>token_type</code></td>
114 <td>The returned token type, <code>Bearer</code>.</td>
118 <h2 id="request">Message request</h2>
120 <h3 id="http">HTTP request</h3>
122 <p><code>POST https://www.googleapis.com/gcm_for_chrome/v1/messages</code></p>
124 <h3 id="body">Request body</h3>
127 In the request body, supply:
132 <th scope="col">Parameter</th>
133 <th scope="col">Description</th>
136 <td><code>Content-Type</code></td>
137 <td>The request body content type, <code>application/json</code>.</td>
140 <td><code>Authorization</code></td>
141 <td><code>Bearer</code> HTTP header including access token, for example,
142 <code>Bearer 1/fFBGRNJru1FQd44AzqT3Zg</code>.</td>
145 <td><code>channelId</code></td>
146 <td>The app or extension channel ID required to push messages back to the app or extension.</td>
149 <td><code>subchannelId</code></td>
150 <td>The subchannel to send the message on; only values 0-3 are valid.</td>
153 <td><code>payload</code></td>
154 <td>The message body (up to 256 bytes). This should not include any
155 personally identifiable information.</td>
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