They donít offer any optional services. We have to sign up a contract with the clinic. According to this contract, they will charge a fixed sum. As weíre going to book several shots, our sum will be divided into several installments. I think itís really handy as weíll be able to plan our expenditures. Weíll be able to make a payment either in cash or via a bank transfer. The clinic seems to be a reputable, so I donít think weíll have any problems with payments.