update safePay method

Author: rez1dent3

src/Interfaces/Customer.php

@@ -21,7 +21,7 @@ public function pay(Product $product, bool $force = false): Transfer;
      * @return null|Transfer
      * @throws
      */
-    public function safePay(Product $product): ?Transfer;
+    public function safePay(Product $product, bool $force = false): ?Transfer;
 
     /**
      * @param Product $product