Cash payment or payment by credit card insures payment at once and reduces administration costs.
It is much easier to let the patient pay while they are still in the clinic. You save time and time is money and you save administration, paper, shipping cost and do not need to send payment reminders. And why not just save the trip to the bank by letting the money go directly into your account.
Data for invoicing is already collected during the consultation from the clinical documentation and the invoice can be done in a few clicks. The clearing module both handle the credit card reader and the clearing with the bank.