This is just a payment method where you will find the total price of the experience. The rest (Carara National Park and Boat Tour) will be paid in cash on the day of the experience.
You can pay with a credit/debit card or via bank account tranfer (only U.S.). For the bank transfer, you will be asked your bank account routing number so afterwards a payment request is asked. All of this is done via Stripe Co. so you can have peace of mind.
Let us know if there is any doubt