Need some hints

[raoul]

Situation:

 

 

 

customer pays amount x , or buys specific service. External APP call the WHMCS database to check if user exists, and if its allowed to execute the specific service, or if there is enough balance to subscract --> if yes, WHMCS substract the service / money balance.

 

 

How can we make WHMCS substract via external call?

[laszlof]

The AddTransaction API call might do the trick:

 

http://docs.whmcs.com/API:Add_Transaction

 

EDIT: If you're wanting to add the service too, you could just use AddOrder as well.