Fix undefined array key error on stored_payment_method_id (#115)

Author: Hakadel

src/Entities/Shared/TransactionPaymentAttempt.php

@@ -21,7 +21,7 @@ class TransactionPaymentAttempt
     private function __construct(
         public string $paymentAttemptId,
         public string|null $paymentMethodId,
-        public string $storedPaymentMethodId,
+        public string|null $storedPaymentMethodId,
         public string $amount,
         public PaymentAttemptStatus $status,
         public ErrorCode|null $errorCode,
@@ -36,7 +36,7 @@ public static function from(array $data): self
         return new self(
             $data['payment_attempt_id'],
             $data['payment_method_id'] ?? null,
-            $data['stored_payment_method_id'],
+            $data['stored_payment_method_id'] ?? null,
             $data['amount'],
             PaymentAttemptStatus::from($data['status']),
             isset($data['error_code']) ? ErrorCode::from($data['error_code']) : null,