Build Me A Ecommerce Website

I Will Sell Digital Products And Services On My Website .
Something Like This - https://valorantmart.com/ , https://www.g2g.com/
Key Features I Want
- Feature To Post Product Easily .
- Instant Delivery To Buyer's Mail After Purchase
- Link A Payment Gateway . ( Razorpay , Payop , Stripe , payu )
- Interactive User Interface And Optimised SEO