Once you have created an element where users can buy credit, it's time to create an element where users can use the credit.
1. In our case, we want to create a booking element where users can pay with "1 lesson", that they have previously bought. To do so, we add a new booking element and click on "More Options". We then give a title, for example "Driving lesson".
2. Click on "Consumables", then click on "New Rule" under "Pay with consumables". Click on "New" and select the consumable and enter an amount. In our case, the user can book this lesson by using one lesson consumable. You may also check the setting under "Consumables not required". If enabled, the user can skip the payment using a consumable and pay normally.