Yes, an invoice for the checkyeti Service Fee is automatically generated for every confirmed booking.
You can find and download it directly from your Order Summary email, which you receive at the conclusion of the booking process. The download link is located at the bottom of that email.
Please note that the invoice mentioned above is only for the checkyeti Service Fee. If you need an invoice for the total cost of the activity, you will need to request it directly from the activity provider (find out more here).