How to make sure my credits will be charged after I bought them, not my credit card

Hi everyone,
After two months of Fly charging my credit card, I’ve added “credits” to my account in order for the card not to be charged each month for the usage. Although, after I’ve added my credits, I’m not able to change payment method. There is still cryptic “Charged automatically” text next to the “Payment Method” field. How can I be sure that it’ll be the credits, and not my card, that are charged in the future? And that the apps will be suspended after I’ve reached the limit, and not my credit card charged?
I’ve tried searching through the Community Forum and the Documentation, but wasn’t able to find clear answers on it.
Thank you guys,

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