When you subscribe, you automatically switch from “pay-as-you-go” to monthly invoicing. Pay-as-you-go means you pay per transaction as soon as your session is finished. Monthly invoicing means you pay for all of your transactions from the last month in a single monthly payment.ExampleYou sign up to a Tap subscription on September 4th. Your invoice period is September 4th – October 4th. You receive your invoice on the first day of your next invoice period, in this case October 5th.