WHMPRESS Payment Gateway Transaction Fees.

Payment Gateway Fees automatically add a transaction charge to your client invoices based on the payment gateway the client selects. The charge can be a percentage of the invoice amount, a fixed amount, or both together.
The fee is recalculated whenever the invoice changes when it is created, when its total is updated, when the client switches to a different payment gateway, and once a day through the WHMCS cron. Clients see the exact charge on the checkout page before they confirm the order, and the charge appears on the invoice as its own line item.

Downloading the Module and Getting the License:
After purchasing the module, log in to your WHMPress client area and navigate to Service> Open your Module license service. Copy the license. And download the Module.