Integration With Fawry Pay

Dears,
I have an issue integrating with a payment gateway “Fawry Pay”

the integration works fine on their plugin I can send them the order but the callback is not working perfectly as per my understanding I just should provide them with a callback URL

10/26/21 10:19:09:106 EET] 00000174 MerchantInteg I MerchantIntegrationService sendHTTPRequest Http response code = 500 for merchant = 99100000106405 request payload {"requestId":"239793ec0a92493ca2c1f3529c5e0e14","fawryRefNumber":"993072184","merchantRefNumber":"533696974631","customerName":"Test Test","customerMobile":"01","customerMail":"[email protected]","paymentAmount":11.0,"orderAmount":10.0,"fawryFees":1.0,"orderStatus":"UNPAID","paymentMethod":"PAYATFAWRY","messageSignature":"7e5f5313e4c257a6cabceae20d3b62ca0b91a8bf5d1a81d00adbe0878afffaed","orderExpiryDate":1672351200000,"orderItems":[{"itemCode":"666666","price":10.0,"quantity":1}]}