API call
What is an API call?
Every time the customer opens the checkout and a rate from the Duty and Tax app is displayed, this is an API call.
If there is one rate for the customers zone defined (and displayed depending on the conditions) and the customer opens the checkout, there will be one API call.
If there are two rates for the customers zone defined (and displayed depending on the conditions), then there will be two API calls, each for every displayed rate.