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    <p>Regardless of the language and library you use, the push notification payload is a JSON payload:</p> <pre><code>{ "aps": { "badge": 10, "alert": "Hello world!", "sound": "cat.caf" } } </code></pre> <p>The <code>aps</code> token is the Apple APN data. You can add custom data to your payload as well:</p> <pre><code>{ "aps": { "badge": 10, "alert": "Hello world!", "sound": "cat.caf" }, "job_id": 1 } </code></pre> <p>When you receive the notification in the app, check for your param in the notification dictionary:</p> <pre><code>- (void)handleBackgroundNotification:(NSDictionary *)notification { NSDictionary *aps = (NSDictionary *)[notification objectForKey:@"aps"]; NSMutableString *alert = [NSMutableString stringWithString:@""]; if ([aps objectForKey:@"alert"]) { [alert appendString:(NSString *)[aps objectForKey:@"alert"]]; } if ([notification objectForKey:@"job_id"]) { // do something with job id int jobID = [[notification objectForKey:@"job_id"] intValue]; } } </code></pre> <p>Keep in mind that the total size of the payload is 256 <em>bytes</em>, and that includes, of course, your custom parameters. So you may have to (at risk of reducing readability) call your custom param "ji" instead of "job_id" to squeeze bytes.</p> <p>All of this is documented in the <a href="https://developer.apple.com/library/content/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/CreatingtheNotificationPayload.html" rel="nofollow noreferrer">Local and Push Notification Programming Guide</a> in the iOS documentation. Definitely would recommend a read because it's more complex than it initially sounds (at least, that's what I thought).</p>
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