Traslate the fees to your customers. This modifies your paypal gateway adding a tax to be paid for your customer; as % , fixed or both
And the best of all
Its free !!
Q: Does it modify my invoice ?
A: No, fees are added inside the paypal gateway, and does not modify your invoice
Q: Can i add fees for other gateways ?
A: No, it works only with paypal, but you can install Gateway No fees
Q: What about upgrades ?
A: It's automatic! AS it works inside your paypal gateway , you have nothing to update in future whmcs versions.
The best place to start if you need help with a specific product is to contact the developer. All WHMCS Marketplace developers have both a website and support URL listed.
This module provides support for the Stripe payment gateway for use with WHMCS.
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Paymentwall module for WHMCS.