Upload The Module.
Next, log in to your Control Panel or FTP. Navigate to Your WHMCS Folder. Then
navigate to modules > gateways. And Upload the Module. After uploading the Module
Extract it.
After extracting the module, navigate to the module folder.
You will find a “Callback” folder. Move the corresponding files into the “Callback” folder.
Then move the main folder and the main file of the module to the modules/gateways directory.
Module uploading is completed successfully.