This video covers the integration of Thrivecart with your Wishloop Agency using Zapier.
Most other payment providers can be set up in the same way provided they provide webhooks. Some payment providers (e.g. Stripe) also have a dedicated Zapier App which makes the setup process even more straightforward.
As mentioned in the Video, here is the link to the Wishoop Agency Zapier app -you should enable this on your Zapier account before starting the setup process.
Thrivecart is a great system to use as it will allow you to create your own affiliate scheme for your agency.
NOTE: This video covers creating a single integration to one of the available Wishloop agency customer plans. If you want to provide multiple pricing tiers for your agency then you will need to repeat this process for each plan.