I think what you need are those services will serve as your crypto payment gateway like these companies.
https://bitpay.com/
https://www.coinpayments.net/
I have not that much knowledge about these gateways and I think there can be some additional inputs from other members who have a better understanding on this. And with shopify, they have suggested the two that I've mentioned including some others.
https://help.shopify.com/en/manual/payments/alternative-payments/cryptocurrency