Help me API crypto payments gateway

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https://bitpay.com/ -> BitPay allows accepting payments in Bitcoin and Bitcoin Cash and settling them in fiat currencies. It also provides an API for integrations.
https://gocoin.cz/en -> GoCoin supports a variety of cryptocurrencies including Bitcoin, Bitcoin Cash, Litecoin and Ethereum.
https://www.coinbase.com/es/commerce -> It is free and easy to use that allows multiple cryptocurrencies to be accepted directly into a user-controlled wallet.
I think these might help you