Which crypto gateway to choose for the payment system?

Question

bitcoin

Good afternoon. Which bitcoin(etc) payment gateway to choose with API?
as I understand it, a separate temporary wallet is created for each person
what is needed: the person needs to pay with crypto, the crypto is credited to the temporary wallet and transferred to my wallet, and so that the cryptocurrency is immediately converted to fiat (usd / eur / rub, etc.
) can you advise?
dug in the direction of block.io but did not find an instant conversion to fiat there (if it is there, tell me)

Answer 1

Use do-it-yourself solutions or coinpayments.
PS a very small number of gateways will be controlled in fiat, it’s easier to exchange it yourself on exchanges