How to use prepaid api in google?

Question

Google

When setting up billing, there is no choice of the order for debiting funds, only a message that funds will be debited automatically.
Although in the info parameter "How you pay" he writes like this:
Automatic payments : Pay after your ads run. Your ads typically start running almost right after you submit billing details. You pay only after you accrue costs, via an automatic charge when you reach your billing threshold or 30 days after your last automatic payment, whichever comes first.
Manual payments : Pay before your ads run. Your ads typically start running after we process your first payment. We deduct charges from your prepaid balance each time your account accrues a cost. If your account runs out of funds, your ads stop running until you make another payment.
It is understood that there is an advance payment.

Am I missing something or is there no choice for some reason?

Answer 1

I think that there, by default, it will be charged every month, and then just if you don’t need the service, you can simply turn it off and the money will not be debited. IMHO.