MPP TestKit

MPP TestKit is a developer infrastructure project focused on machine-to-machine payments on Solana. It provides tools, SDKs, documentation, and testing environments for developers who want to build HTTP 402 payment flows, where an API can request payment before completing a response. The project helps builders experiment with pay-per-request APIs, payment receipts, payment proofs, automated settlement, and app-to-app payment logic in a practical way.