daraja-payment-design SKILL.md skillA
daraja-payment-design from mr-macharia/mpesa-daraja-skills-and-mcp is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add mr-macharia/mpesa-daraja-skills-and-mcp/daraja-payment-design@git:20261027.b5b270ePins git:20261027.b5b270e in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- mr-macharia/mpesa-daraja-skills-and-mcp
- Path
skills/daraja-payment-design/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261027.b5b270e, committed Oct 27, 2026
- Size
- 8,390 bytes
- Repository stars
- 3
- License
- MIT
Designs the system around M-Pesa Daraja calls so money is never lost or double-counted. Covers the payment state machine, an append-only ledger with integer shillings and unique receipts, callback confirmation handling, reversals versus B2C refunds, daily reconciliation, failure testing in the sandbox, and a go-live checklist, plus a script that scans a codebase for common integration mistakes. Use when building or reviewing a payment integration, designing payment tables, handling…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Designing an M-Pesa payment system
The per-API skills (`daraja-stk-push`, `daraja-b2c`, …) say how to call Daraja. This skill is about everything around those calls: what you store, when an order counts as paid, and how you recover when something is missing.
## Start by checking the existing code
Run this on the project, then fix what it reports:
```bash
python scripts/check_integration.py path/to/project
```
It flags orders marked paid on `ResponseCode "0"`, float amounts, receipts without a unique constraint, slow callback handlers, hardcoded secrets and non-HTTPS callback URLs. The checks are heuristic: read each finding before changing code. Exit code 1 means at least one high-severity finding.
## 1. The state machine
Every payment row moves through these states, and only the listed signal moves it:
```
send request callback / query ResultCode 0
initiated ───────────────▶ accepted ──────────────────────────────────▶ confirmed ──▶ reversed
│ Daraja rejects │ callback / query ResultCode ≠ 0 (reversal
▼ (error response) ├──────────────────────────────────▶ failed or refund
…Read the whole file at its exact version.
How to install
mdr add mr-macharia/mpesa-daraja-skills-and-mcp/daraja-payment-design@sha256:1da60b9290933d23The line at the top of this page pins the label git:20261027.b5b270e, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_zqypv25y7lvyttwn)
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Versions
The registry has recorded 1 version of this file, committed on Oct 27, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (8390 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
mr-macharia/mpesa-daraja-skills-and-mcp · 3 stars · license MIT · pushed 2026-11-03 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_zqypv25y7lvyttwn GET https://markdownregistry.com/api/v1/resolve?ref=mr-macharia/mpesa-daraja-skills-and-mcp/daraja-payment-design GET https://markdownregistry.com/api/v1/blob/1da60b9290933d235d03cd76c6424b99724184a0f7531df7c2027fcec59ac6d5
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.