ios - Can apple push notifications send more parameters than alert and sound?

Question

I have several pieces of metadata that I need to associate with a push notification.

For example user no, message id.

Can I send more parameters than what apple supports:

 {aps =     {
    alert = joetheman;
    sound = default;
};}

Is this possible?

Answer 1

Yes. In the Push Notification Programming Guide section The Notification Payload it states

Providers can specify custom payload values outside the Apple-reserved aps namespace. Custom values must use the JSON structured and primitive types: dictionary (object), array, string, number, and Boolean. You should not include customer information as custom payload data. Instead, use it for such purposes as setting context (for the user interface) or internal metrics. For example, a custom payload value might be a conversation identifier for use by an instant-message client application or a timestamp identifying when the provider sent the notification. Any action associated with an alert message should not be destructive—for example, deleting data on the device.

So your payload might look like

{
    "aps": {
        "alert": "joetheman",
        "sound": "default"
    },
    "message": "Some custom message for your app",
    "id": 1234
}

Further down on that same page are a number of examples that demonstrate this.