Checking validity of a coupon code using API?

[dmatteson]

I'm writing a custom order page for WHMCS and so far have managed to stick to using API calls for interfacing with WHMCS, and would like to continue to avoid doing direct MySQL queries, however at the moment I do not see any way to check whether the coupon code a user entered is a valid one using the API. Am I missing something?

 

Thanks!