Fatal error: Uncaught Error: Class "Stripe\SingletonApiResource" not found in C:\xampp\htdocs\bookingsystem\vendor\stripe\stripe-php\lib\Billing\CreditBalanceSummary.php:15 Stack trace: #0 {main} thrown in C:\xampp\htdocs\bookingsystem\vendor\stripe\stripe-php\lib\Billing\CreditBalanceSummary.php on line 15