When I select Upfront payment there is an option to pick a product. On the appointment booking page it only shows product in main company currency. It remains unaffected by changing the currency of payment providers.

Navigate to the appointment module in Odoo interface.

Click on the "New" button to create a new appointment.

Choose the option for "Up-front Payment" from the available choices.

Click on the "Configure Payment Providers" option.

Select your preferred payment provider from the list.

In the availability settings, look for the currency options.

There should be a list of many currencies to select from.

Choose the currency you want to use for this appointment.

Save your settings to ensure the new currency is applied to your appointment bookings.

By following these steps, you should be able to book paid appointments in the currency of your choice.

If you need further assistance, please let me know!