I'm getting a 'Please select at least one platform' error when using the `/createMessage` API. How can I fix this?

The error "Please select at least one platform" from the /createMessage API means the request does not resolve to any platform to send to. This happens either because your application in the Pushwoosh Control Panel has no platform configured, or because the platforms array in the request contains no valid, configured platform.

1. Check the application configuration: in the Control Panel, verify that the platform you target is configured for the application (for example, iOS has a valid .p12 certificate or .p8 key, Android has an FCM service-account JSON uploaded).

2. Let Pushwoosh target all configured platforms: simply omit platforms. The message is then sent to every platform enabled for the application.

   {
     "request": {
       "application": "YOUR_APPLICATION_CODE",
       "auth": "YOUR_API_ACCESS_TOKEN",
       "notifications": [{
         "send_date": "now",
         "content": "Your message content",
         "devices": ["DEVICE_HWID_1", "DEVICE_HWID_2"]
       }]
     }
   }
   

3. Or specify platforms explicitly with the optional platforms array of platform codes:

   {
     "request": {
       "application": "YOUR_APPLICATION_CODE",
       "auth": "YOUR_API_ACCESS_TOKEN",
       "notifications": [{
         "send_date": "now",
         "content": "Your message content",
         "platforms": [1, 3]
       }]
     }
   }
   

   Current platform codes: 1 iOS, 3 Android, 7 Mac OS X, 8 Windows, 9 Amazon, 10 Safari, 11 Chrome, 12 Firefox, 17 Huawei. See the Messages API reference for the full list.

4. Platform-specific content keys such as ios_badges, ios_sound or android_header only customize the payload for a platform — they do not select the platform. Use platforms (or omit it) for targeting.

Finally, make sure the payload is well-formed JSON. JSON does not allow comments, so do not leave // notes inside a real request body.