Hey @sardarusama4106 ,
There is no public Shopify API for pulling the list of Payment Gateways available for the Merchant.
Keep in mind that if you are trying to build a custom checkout experience, you need to use the Sales Channel SDK and also request for payment processing (https://help.shopify.com/en/api/guides/sell-through-the-checkout-api#completing-the-purchase)
Hassain | Developer Support Specialist @ Shopify
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