Outdated Fawry Integeration

[david-maximous]

Hello,

It seems that Fawry integeration is outdated and not working. According to Fawry's documentation, the signature must have:

merchantCode + merchantRefNum + customerProfileId (if exists, otherwise insert "") + returnUrl + itemId + quantity + Price (in tow decimal format like ‘10.00’) + Secure hash key

Also, after updating the signature key it seems that there's another bug that makes the request show a blank page instead of redirecting the user to the payment link/generate payment page. I tried to trace the issue but I didn't find the root cause.