Whop-Shopify Checkout Integration

I want to connect my Shopify store to Whop through a fully custom solution rather than a plug-and-play app. The goal is to let shoppers complete their purchase in Shopify while the system quietly passes the order to Whop, triggers licence delivery, and routes payouts exactly the way Whop expects... (Budget: €30 - €250 EUR, Jobs: API Development, JavaScript, Node.js, PHP, Python, Shopify Development, Software Architecture, Vercel)