refactor: migrate amount fields to decimal and implement location service restriction for unsupported regions

backend/functions.php

@@ -327,7 +327,7 @@ function notifyPassengerOnRideServer($passenger_id, $payload) {
     $postData = [
         'action'       => 'update_ride_status',
         'passenger_id' => $passenger_id,
-        'payload'      => $payload
+        'payload'      => is_array($payload) ? json_encode($payload) : $payload
     ];
 
     $ch = curl_init();