For example a firm provide his customer to make payment 30 days after buying without charging interest . In this case can I say sentence below to describe this situation and are word orders correct? I know it is hard to understand but As I am not native speaker I have to make sentence with my limited information. I just wonder if I grammatically describe this situation with these sentences.
1) There is a option in the firm A which provides customer to make payment 30 days after buying without paying interest.
2) There is a option of payment deferred for 30 days without interest in the firm A.
3)There is a payment option which will be made after 30 days after buying without interest in the firm A.