This tutorial shows how to use the Payment Method Table.
Go to the Data Mapping and scroll down till you find the field we in the Core call payment.methodId:
Next, map the fields you want to use in the Payment Method Table:
OrderFlow > Settings > Customer setting > Use Default Payment Method Id Mapping Table
Here we link the payment ID's defined in your ERP to the payment ID's from the api of your webshop. So that the payment method is included on your order.