If a customer paid you through alternative means - if the option is not listed in the Payment Options menu on the Split/Other (four squares) payment screen - we recommend using CHECK as the invoice's payment method.
This allows you to use the Check Number field to note the payment type and even account ID as appropriate (e.g., PayPal or XFER 5678).
You can also create a custom Credit Card option to be used by the Split all other tender type. To do this you will need to follow the steps below.
a. You will see in the Card Type Dropdown the new card you created, this only records the transaction with that Card Type. You can use the Last four to record the last four of the card and the Authorization field to record an order confirmation number, or transaction number.