If you would like to have a deposit or guarantee.
You can add a payment & check the box 'guarantee':
1/ Open the booking
2/ Click on 'add a payment'
3/ Put in the contact and the amount + check the box 'guarantee'
4/ This payment will be add in grey with the payments, there is an extra balance column that shows the deposits
5/ On the dashboard you can see if the guest paid a deposit
6/ On the administration tab of the booking, you can see the payments that are considered as a deposit withe the special icon
6/ From the dashboard you can do the refund of the deposit by clicking on the icon next to the amount.
7/ when generating the invoice, the deposit can be used to pay the invoice