Integrating external Vouchers (gift cards) into Shopify payment gateway

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Hi there, I'm a developer for a Voucher website and we are looking at integrating our Vouchers to be redeemed on Shopify ecommerce stores for our customers that are on our platform. They are already set up with us and they want to be able to use the Vouchers sold on our system to be redeemed via their online store on Shopify. How do we go about getting started and which API's should we look at scoping this out, if it's possible. I see that Custom Payment Gateways are not allowed until later in 2021? Is this what we would have to build? 

Thanks for your help!