Next.js Crypto Wallet Integration

My uniform-shop demo is built with Next.js. Right now it shows products but stops short of a true Web3 checkout. I want to layer in cryptocurrency wallet support so customers can purchase a single jersey or fill a cart with bulk quantities and pay straight from their wallets... (Budget: $15 - $25 USD, Jobs: Blockchain, Ethereum, Ethers.js, HTML, JavaScript, Next.js, PHP, Smart Contracts, Software Architecture, Web3.js)