Crypto Payment Gateway

Build a scalable crypto payment gateway where merchants can easily integrate our API, accept cryptocurrency payments, and receive automatic settlements while our platform manages payment detection, transaction tracking, and webhook notifications. Project: Crypto Payment Gateway (Similar to 0xProcessing) I'm looking for a developer to build a custodial crypto payment gateway. Requirements: Merchant registration and dashboard API key generation Create payment invoices via API Generate unique crypto payment addresses (start with USDT TRC20) Hosted checkout page with QR code Blockchain listener to detect payments Update invoice status after confirmations Send webhook to the merchant when payment is completed Automatically deduct our processing fee Automatically transfer the remaining crypto to the merchant's wallet Transaction history and settlement history Admin dashboard to manage merchants, transactions, and payouts Preferred Tech Stack: Next.js NestJS / Node.js PostgreSQL + Prisma Redis TronWeb (initially only USDT TRC20) The system should be secure, scalable, and designed so additional blockchains (BTC, ETH, Solana, BNB, etc.) can be added in the future. I want an MVP first, with clean architecture and well-documented APIs.