Thanks for this module, it's very handy.
Just some requests for enhancements:
Some WHMCS implementatins require that headers are included in the API calls. Can the scripts for this module be updated to accomodate this where needed?
As the update script only runs once a day, new customers will see an error message in the toast pop-up for the entire first day. Could a script be added to run after service creation as well?
Users with dedicated servers don't have billing IDs in their services. Where a servive runs on a server that is assigned an owner (thus a dedicated server), could the billing ID of that server be used in the Billing Alert for that service? Alternatively, could a way be added to mirror the service ID of a dedicated server in each of the services on that server?