Step 1. Create a new product with the Simple type and enable Sold individually option.
It is not required to set the price because it will be calculated automatically.
The name of the product can be whatever you need, for example, Booking.
Put any price for the product here. It’s just the need to put one by default to continue the installation. The final price will be calculated according to the one you have entered in the Service.
And set the Catalog visibility to hidden.
Step 2. Open the WooCommerce tab of Webba Settings page and set the id of product we created in the first step:
Step 3. Open the Service settings (Services > Edit service) and add WooCommerce as payment method: