Shopify E-Commerce Site Build & Integrations

I want to launch a full-featured Shopify store from the ground up. The build must cover everything needed to start selling online, with two essentials locked in from day one: • Payment gateway integration – configure a reliable gateway, run a test transaction, and confirm payouts reach my account... (Budget: ₹600 - ₹1500 INR, Jobs: eCommerce, HTML, Java, JavaScript, Payment Gateway Integration, PHP, Shopify, Shopify Development, Shopify Plus, Website Design)