Applying customers credit to an order through the API

[kevinsheahan]

Does anybody know how to apply any customer credit that may exist to an order once the order has been created through the API. 

For instance, I create the order with 'AddOrder' - from that I can get the invoice and order ID. Can I then apply any credit the client may have on account to this invoice?

Thanks in advance.

[DennisHermannsen]

You can use the ApplyCredit function: https://developers.whmcs.com/api-reference/applycredit/

Before doing that, I would recommend that you check if the client has enough credits on their account.

[kevinsheahan]

Thanks for the reply. I saw this just after posting my question. Just one more thing. If a customer wants to use known credit, what payment method can they choose. At the moment I have 'globalpay' for credit card and 'mailin' for cheque/cash payment. 

Is there a paymentmethod (in AddOrder) which covers applying existinf credit?