To buy: I buy on cash OR I buy with cash

[Batman]

Hello Alan and Torsten! I need your help! What is correct?
...I buy on cash... I buy with cash..... I buy for cash.....
... I buy for credit..... I buy on credit...
thank you
Batman

[Alan]

Hi,

Buy for cash/with/by credit.

Alan
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English as a Second Language
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[Hothu]

Dear Alan,
You wrote:

[Kitosdad]

I bought the car on credit.
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If you need me, I'm here.

[Hothu]

Hello Kitosdad,
Thank you for your answer. I think I can write both of them.