If you are running Adagio Receivables 8.0A, then under the Edit menu, the last choice is Payment Methods. From here you 'create' the credit cards and other possible methods (cash, cheque, etc).

Then edit a customer and a new tab called Credit Card will be available to select. Choose any of the 'payment methods' you just created, and also include the credit card information.

When you are in Adagio OrderEntry 8.0A and click the Payment field to assign a payment, the first field will be Payment method, and the drop-down shows all the Payment methods created in Receivables. The bottom two rows on the OE Payment screen are credit card number, expiry and name. These fields can be typed into, or read from the customer record if the credit card information is kept.

None of the above will appear if you have not installed both of the 8.0A upgrades for Adagio Receivables and OrderEntry.