I have implemented an FCM server side, Server side not delivering - php

Question

I am trying to implement a php curl fcm topic broadcasting and it just displays {"message_id":4731721763997571462} and does not deliver.
I have gone through a lot of search and to no end, I can't seem to find the problem.
// API access key from Google API's Console
define( 'API_ACCESS_KEY', 'Legacy_server_key' );
// prep the bundle
$msg = array
(
'message' => 'here is a message. message',
'title' => 'This is a title. title',
);
$fields = array
(
'to' => "/topics/hello",
'notification' => $msg
);
$headers = array
(
'Authorization:key='. API_ACCESS_KEY,
'Content-Type: application/json'
);
$ch = curl_init();
curl_setopt( $ch,CURLOPT_URL, "https://fcm.googleapis.com/fcm/send" );
curl_setopt( $ch,CURLOPT_POST, true );
curl_setopt( $ch,CURLOPT_HTTPHEADER, $headers );
curl_setopt( $ch,CURLOPT_RETURNTRANSFER, true );
curl_setopt( $ch,CURLOPT_SSL_VERIFYPEER, false );
curl_setopt( $ch,CURLOPT_POSTFIELDS, json_encode( $fields ));
$result = curl_exec($ch );
curl_close( $ch );
echo $result;
I just expect to get a notification on the device and maybe there is a way I can trace successful notifications on the google console?

Answer 1

You need to add registration ids with field parameter
// API access key from Google API's Console
define( 'API_ACCESS_KEY', 'Legacy_server_key' );
$registrationIds = array( "/topics/obajemusagmailcom" );
// prep the bundle
$msg = array
(
'message' => 'here is a message. message',
'title' => 'This is a title. title',
);
$fields = array
(
//'to' => "/topics/hello",
'registration_ids' => $registrationIds,
'notification' => $msg
);
$headers = array
(
'Authorization:key='. API_ACCESS_KEY,
'Content-Type: application/json'
);
$ch = curl_init();
curl_setopt( $ch,CURLOPT_URL, "https://fcm.googleapis.com/fcm/send" );
curl_setopt( $ch,CURLOPT_POST, true );
curl_setopt( $ch,CURLOPT_HTTPHEADER, $headers );
curl_setopt( $ch,CURLOPT_RETURNTRANSFER, true );
curl_setopt( $ch,CURLOPT_SSL_VERIFYPEER, false );
curl_setopt( $ch,CURLOPT_POSTFIELDS, json_encode( $fields ));
$result = curl_exec($ch );
curl_close( $ch );
echo $result;
and $registrationIds = array( "/topics/obajemusagmailcom" ); is not registration id of any app, please correct it.

Answer 2

Finally after much horror and tries, turned out the array fields were incorrect and were meant to be
$msg = array
(
'body' => $body,
'title'=>$title
);
$data = array
(
'to' => "/topics/".$topic,
'notification' => $msg
);