URGENT API Settlement System Development

Looking for a program that can operate through own API-based Infrastructure, Receive and process API-based settlement instructions from private financial institutions, private servers and can facilitate conversions of M0/M1 Off-ledger funds into movable assets into the blockchain/on-chain... (Budget: $1000 - $3500 USD, Jobs: API Development, API Integration, API Testing, Blockchain, C++ Programming, JavaScript, Node.js, Payment Gateway Integration, Python, Software Architecture)