How to create a buy button for Appstle subscriptions?

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Hi there- I'm building a new front-end to my shopify site on Showit (it's more visually customizable). I have added buy buttons for all my products EXCEPT my one product that I sell on subscription through Appstle. Appstle assured me that a buy button can be created for their subscription, but it has to be done through Shopify. Shopify said it's too complex and apparently I need a coding solution. Can someone please help me? Thank you!