If the client is purchasing a free product or using a coupon code that brings the total down to $0.00, they're still required to choose a payment method.
So this module is taking care of the situation and removing all other payment options from the shopping cart page. And showing instead only this "No Payment" gateway.
How to install the addon:
First unzip it in the main WHMCS folder
Then go to "Setup > Payments > Payment Gateways" from the top admin menu
Add this "No payment required" gateway to your payment options
You can configure and customize the gateway name or description from the "Manage Existing Gateways" tab
The GDPR (General Data Protection Regulation) is the most important development of Data Protection Law for decades. It will strengthen and ultimately replace the existing Data Protection Act (1998) and is designed to protect the personal data and privacy of citizens across Europe. GDPR will not be affected by the UK’s exit from the EU and the Regulation comes fully into effect on 25 May 2018.