Fatal error: Uncaught Stripe\Exception\InvalidArgumentException: api_key cannot be the empty string in /app/vendor/stripe/stripe-php/lib/BaseStripeClient.php:374 Stack trace: #0 /app/vendor/stripe/stripe-php/lib/BaseStripeClient.php(92): Stripe\BaseStripeClient->validateConfig(Array) #1 /app/public/index.php(18): Stripe\BaseStripeClient->__construct(Array) #2 {main} thrown in /app/vendor/stripe/stripe-php/lib/BaseStripeClient.php on line 374