PayPal Sandbox
The Moehaha.com WHMCS reference implementation uses a PayPal Sandbox.
This PayPal Sandbox is linked a PayPal developer account for [email protected].
On https://developer.paypal.com/developer/accounts/ you get to see all accounts linked to the PayPal Sandbox, you can add more accounts here:
One of the sandbox accounts is [email protected], when you click it you will see the Profile link:
If you click it, you'll see the profile details, most importantly the API Credentials:
These credentials are needed to configure the PayPal integration in WHMCS.