QUESTION/PROBLEM:

i am using Payeer WHMCS module. I did some updates in my WHMCS and not long time after that my client told me he have problem paying via payeer. he mentions this error:

Incorrect signature. You can see the correct signature in the merchant settings on the tab "Testing".

ANSWER:

You've formed the signature incorrectly, valid signature can be found in the store settings in the "Testing" tab.

SOLUTION:

try downloading new version of the Payeer WHMCS module from Payeer account / Dashboard / Merchant settings / Settings / Website connection ?