By pressing the small i next to booking information, you will find the customer card of the booker. On the customer card you can do the following:
1. Fixed price or percentage discount
2. If you want them to receive an invoice, you can choose the preferred payment type to be invoice
3. You specify the discounts in the box below on each type of room, i.e. if you want a 10% discount on triple rooms and 0% discount on double rooms, you can give it to them by typing 10 and 0 in the corresponding fields
4. If you want the guest to be invoiced after your stay, activate "create order after stay"
Then you can put a password on the box next to it. Afterwards the user can log in with the email address and password you have created.