🗺️ Backend Engineering · Journey Playbooks

Playbook: Take payments without duplicates

Process money mutations with idempotency guarantees and clean audit trails.

journey~90 minBackend EngineersAPI DevelopersPlatform Engineers

Journey Steps

1Step 1 — Make writes safe with idempotency keys: start with "Require an Idempotency-Key header on POST payments, orders, and signups"
2Step 2 — Validate all external input at the boundary: start with "Define schemas per endpoint covering body, query, params, headers"
3Step 3 — Build trustworthy background job processing: start with "Make handlers idempotent; assume at-least-once delivery"
4How it fits together: Money endpoints get idempotency keys, validation schemas, and job-based side effects. No exceptions.

Commands

Install all referenced skills

$ npx skills add aniruddhaadak80/skills --skill api-design-idempotency-keys && npx skills add aniruddhaadak80/skills --skill auth-security-input-validation-zod && npx skills add aniruddhaadak80/skills --skill caching-queues-background-jobs

Tags

#playbook#journey#backend-engineering

Install this skill

$ npx skills add aniruddhaadak80/skills --skill playbook-backend-engineering-payments-safe -a opencode

SKILL.md

# Playbook: Take payments without duplicates

> Process money mutations with idempotency guarantees and clean audit trails.

## When to Use This Skill

Process money mutations with idempotency guarantees and clean audit trails.

## Steps

1. Step 1 — Make writes safe with idempotency keys: start with "Require an Idempotency-Key header on POST payments, orders, and signups"
2. Step 2 — Validate all external input at the boundary: start with "Define schemas per endpoint covering body, query, params, headers"
3. Step 3 — Build trustworthy background job processing: start with "Make handlers idempotent; assume at-least-once delivery"
4. How it fits together: Money endpoints get idempotency keys, validation schemas, and job-based side effects. No exceptions.

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