Hey there @sapieduca - great question!
At this time, our payment integrations can accept payments using the following currencies:
$ AUD - Australian Dollar
$ CAD - Canadian Dollar
€ EUR - Euro
£ GBP - Pound Sterling
$ USD - United States Dollar
If you'd prefer to collect payment with a different currency, you could include a payment link on your confirmation page to direct invitees to your preferred payment portal. Customizing your invitee notification emails to include that link might do the trick as well! While these options won't ensure users pay for the service prior to booking, it may allow some more flexibility.
Because the currencies accepted are based on settings in the payment provider itself (Stripe) and not Calendly, we are not able to make exceptions to this/add additional currencies at this time. I know this isn't exactly what you wanted to hear but do hope the information helps, at least somewhat!