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Fatal error: Uncaught TypeError: base64_decode(): Argument #1 ($string) must be of type string, null given in /owin/api/www/coupon.php:12 Stack trace: #0 /owin/api/www/coupon.php(12): base64_decode(NULL) #1 {main} thrown in /owin/api/www/coupon.php on line 12