Tax option is not good for charging fees, It will be best if there is any option available if we mark it then payment fees deducted from client end not from merchant end.
Our module Payment Gateway Charges For WHMCS will do the job for you: http://www.modulesgarden.com/products/whmcs/payment_gateway_charges/features
Thats paid, I checked this module, it's a great module but i want some thing which come built inside WHMCS and will be free.
And it will be more best if fees are not show on whmcs cart or checkout, just some changes, through which all fees's are deducted from client end.
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