How can we improve WHMCS?

The Namecheap API does not allow you to pay for transactions with an account attached credit card. But the API does allow for topping up the account credits from a credit card. I propose adding in safety checks if there are not enough funds in the account before processing a new transaction (ex. renewal or new domain registration) then the module will automatically top-up the Namecheap account with the required amount before processing the transaction.