Unfortunately, no such opportunity exists. It is impossible to pay at the box office of a hospital for the following reasons:
Because of a frequent non-payment, hospitals refuse to book places for foreign patients without advance payment.
Besides, neither the invitation nor the confirmation is not given without advance payment.
A hospital, unlike a clinic, is a government facility. For this reason, not all hospitals have commercial offices since they were under a ban earlier.
Unlike hospitals, private clinics can bill. Hospitals do not do that. As we have already written in answers to other questions – in France medicine is not goods.
Our aim while escorting our clients is to guarantee a hospital a timely payment and a legality of the payment.
Having the documents confirming the fact of payment, the patient is already protected from every side. Heaven forbid, if something happens – the case against the doctor or clinic will be opened in a minute.
You will need no contracts. Laws protect the patient in France. On your side, you will have a large number of various instances, which represent namely your interests but not interests of doctors and clinics.