To edit already-added payment methods in your eShop:
Log in to IONOS and select the relevant contract.
In the Online Marketing area, click on eShop.
Click Manage eShop.
In the upper navigation bar, select Settings > Payment
Now click on the link of the payment method you want to edit, e.g. Invoice. Here you can adjust the properties of the payment method to your needs.
Customise the payment method properties and click Save.
See Help in the Help Center for detailed explanations of the setting options.