To add type of payment to the cash register (eg pay with a credit card) you can navigate to:
1. Settings
2. Register
3. Payment types
4. Activate the payment type by clicking on them (blue frame appears)
5. Press "Save" at the bottom

If you want to add an extra payment type such as "Payconiq" for example, you can easily create it yourself.

1. Click on "Create" at the bottom.
2. Enter the name of the new payment type (Payconiq) and choose a color.
3. Click on "Save"
4. Activate Payconiq by clicking on it (blue frame appears)
5. Press "Save" at the bottom

You will now be able to use it at the checkout.