Hello
I can help you develop WHMCS Addons Module for this purpose. I will need access to your WHMCS development installation and API credentials.
I am experienced in developing WHMCS Provisioning Modules, Merchant Gateway Modules, Tokenized Gateway Modules, Third Party Gateway Modules, Addons Modules and WHMCS hooks. I will discuss the detailed technical approach on chat.
For your consideration, please take a look at my past projects:
https://www.freelancer.com/projects/php/Creat-WHMCS-Module/
https://www.freelancer.com/projects/php/square-payment-gateway-for-whmcs/?w=f
https://www.freelancer.com/projects/php/whmcs-module-api-oneprovider-18587726/?w=f
https://www.freelancer.com/projects/php/whmcs-payment-gateway-18490355/?w=f
https://www.freelancer.com/projects/php/whmcs-payment-gateway-development/?w=f
Regards