The payment gateway must work with WHMCS and not with your reseller account (ResellerClub, NetEarthOne, Resell.biz, etc.). Provisioning will happen once a customer has paid the invoice through the payment gateway you offer with your WHMCS.
Wanted to know if I can manage, buying of domains, hosting, and other services via your modules.
Yes, it does not matter which payment gateway you use.
Automation here, automation there, automation everywhere! The new v4 Modules will mark a before and after for selling, provisioning, and managing Products / Services with ResellerClub, NetEarthone and many others using the biggest reseller platform LogicBoxes / OrderBox in the domain and hosting Industry.