MPP Charge Flow (One-Time Payments)

Before writing code

Fetch live docs:

1. Fetch https://www.npmjs.com/package/mppx for the charge middleware API and configuration
2. Fetch https://paymentauth.org/ for the canonical charge intent specification
3. Web-search site:github.com stripe-samples machine-payments charge for charge flow sample code
4. Fetch https://docs.stripe.com/payments/machine/mpp for Stripe charge integration details

Conceptual Architecture

What Charge Intent Is

The charge intent implements immediate, per-request settlement. Each API call triggers a single payment. The flow is: