android - PHP Firebase Clood Messaging (FCM) error missing registration -


i building push notification server fcm server. getting following errors: error=missingregistration

my php code given below.

function send($id,$title,$text){   $msg = [     'title' => $title,     'body' => $text,     'icon' => 'myicon',      'sound' => 'mysound'   ];    $fields = [     'to' => $id,     'notification' => $msg   ];    $headers = [     'authorization: key=' . $api_key,     'content-type: application/json'   ];    $ch = curl_init();   curl_setopt($ch, curlopt_url, $url);   curl_setopt ( $ch, curlopt_post, true );   curl_setopt ( $ch, curlopt_httpheader, $headers );   curl_setopt ( $ch, curlopt_returntransfer, true );   curl_setopt ( $ch, curlopt_postfields, $fields );   $result = curl_exec ( $ch );   curl_close ( $ch );   echo $result; }

i calling function this:

send($id,$title,$text);

for sending data fcm need create json data. please add line after fields

$fields = json_encode($fields);

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