How to Buy apps on a iMac without a credit card?

Ok i have a new iMac and i logged into my apple account and there's $2 on it from a card i used a long time ago and i wanted to buy Block world craft for $1 and when i click buy it keeps telling me to put in credit card information. How do i stop this because i already have funds in my account why do i need to put credit card information? ( i also bought apps from the app store on my iPhone but on my iMac it docent let me)

Ask Mac they will tell you

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