An existing web application now needs native Ethereum‐based payment processing. The goal is to let end-users connect a wallet such as MetaMask, send the required amount of ETH, and have the transaction status flow back to my backend in real time so orders can be confirmed automatically. Scope of work • Build or configure the smart-contract logic (if needed) to receive and forward payments, keeping gas fees in mind. • Wire the front-end to Web3/Ethers.js so the user experience is a single-click “Pay with Ethereum” flow. • Expose clear callbacks or webhooks to my server so I can mark invoices as paid once the transaction is mined. • Provide thorough, step-by-step documentation so I can repeat the setup on staging and mainnet environments. Acceptance criteria 1. A testnet demo shows a complete payment round-trip with transaction hash, confirmations, and final backend acknowledgment. 2. Code is clean, commented, and pushed to a private repo with a short README outlining environment variables and deployment steps. 3. No custodial handling of private keys—users sign transactions directly from their own wallets. If this aligns with your Ethereum integration experience, I’ll share repo access and any additional API endpoints you might need for seamless hand-off.