We're using ISPAPI as a lookup provider and that has worked fine up until now. To be clear, this is not an issue with the lookup provider but rather how WHMCS works.
We're developing a custom registrar module and we need to modify on the CheckAvailability function. Unfortunately, we can't use our module's CheckAvailability function because we've already configured ISPAPI as the lookup provider.
It would be great if we could override the lookup provider for specific TLDs.
WHMCS Team Clarification:
This request is scoped to consider the ability to specify a lookup provider on a per-TLDs basis.