In the section of your profile settings under "Integrations" -> "Online payment" you can connect to Stripe and bexio, view your connections or edit your general settings for online payment. If you don't have a Stripe account, you will need to register briefly to be able to offer online payment. Here you can read more about connecting to Stripe.
When you have successfully connected to Stripe, it will show you the following settings:
If you want to activate online payment for both appointments and group appointments, then activate the following two buttons.
If you want to remove your Stripe account, then click on "Remove Stripe". The same applies to the bexio account.
You can find more about online payment and the general settings here.