This will create a new Transaction

This will attribute a payment to an Invoice. Please note that this request requires valid parameters for all associated members of the Transaction or the request will fail. If you have doubled-checked all parameters and the request is still failing, check that the payload JSON format is correct by using <a href="http://jsonlint.com/">JSONLint</a>. If credit card and billing information already exist for this contact, you may omit <b>billing_address</b> and <b>payer</b> from the request.