Getting JSON_PARSER_ERROR while calling Google FCM in MobileFirstAdapter JS

Question

I am calling Google FCM Api for Push Notificaation. This is my code in JS file:

    function sendNotificationToUser() {
      var request={
        path :'/fcm/send',
        method: 'POST',
        returnedContentType : 'text/plain',
        headers: {
          'Content-Type': ' application/json',
          'Authorization': SERVER_KEY
        },
    parameters : {
            'to': USER_AUTH_KEY,
            'notification':JSON.stringify({
                  'title': 'Welcome',                
                  'body':'Hi there'
            })
        };
    var response = WL.Server.invokeHttp(request);
    return response;

But getting error saying BadRequest, JSON_PARSING_ERROR: Unexpected character (t) at position 0.

I am using MFP 7.1 and making the call to https://fcm.googleapis.com/fcm/send

Someone please guide me.

Answer 1

Since your backend service ( running on WAS) is contacting FCM to send the notification, you should not be invoking FCM directly from within MFP adapter.

Use a HTTP adapter to call the backend and pass the parameters to your backend service.

If you intend to call FCM directly from MFP adapter, you should server side Push APIs and not invoke FCM endpoint directly.

Refer to WL.Server.notify* APIs