How to activate/deactivate a payment method?

To activate or deactivate a payment method, you have to go to your Back Office > Configuration > Your payment types 

Here you can activate or deactivate the means of payment that you will use and accept for cashing.

Notice that you can also select "open the cash drawer" for each payment method. This way, your cash drawer will open automatically every time you want to bill a customer by selecting this payment method. 

Also you can activate the options to display the "change" or the possibility to "generate a voucher".

When you have finished, go to your SumUp app, remember to synchronize and you will see your new payment methods.