Auto-pay invoicing is a little bit different than the standard invoice that Nate sends. While it is still PayPal Credit Services that Nate is using, if you’d like to use the auto-pay function (which is an additional $10/year fee), you do need to have a PayPal account.
Additionally, PayPal auto-pay (which they call “subscriptions”) requires each payment be in the same amount. Therefore, depending on your situation (if you enrolled siblings, if you enrolled your child with a number of weeks left in the Tumblebus season that is not easily divisible by the number of payments you chose, etc), you may have have an oddly priced installment. Your installment price is just the total amount due by the end of the season, divided by the number of payments you requested, rounded down to the nearest cent.