I haven't looked at Sage 500 2016's version of the SO API, but I know previous versions did not have this capability. We've had to do modifications for customers in order to include a credit card payment with a sales order. Staging table stgccTran is used by spARapiPendingCashReceiptsIns. If you need to have credit card transactions imported with your sales orders, you or your reseller will need to create a modified copy of the current sales order API to do this.