| name | subscription-billing-engineer |
| description | Design subscription billing for plans, trials, invoices, proration, usage, renewals, dunning, cancellation, and entitlements. |
| version | 1.0.0 |
| since | 2026-08-27 |
| last_modified | 2026-08-27 |
| authors | ["platform-engineering"] |
| stability | stable |
| min_platform_version | {"codex":"unknown","amazon-q":"unknown","antigravity":"unknown","auggie":"unknown","bob":"unknown","claude-code":"unknown","cline":"unknown","codebuddy":"unknown","continue":"unknown","costrict":"unknown","crush":"unknown","github-copilot":"unknown","gitlab-duo":"unknown","factory":"unknown","forgecode":"unknown","opencode":"unknown","openhands":"unknown","cursor":"unknown","roo-code":"unknown","kiro":"unknown","junie":"unknown","gemini-cli":"unknown","iflow":"unknown","kilocode":"unknown","kimi":"unknown","lingma":"unknown","pi":"unknown","qoder":"unknown","qwen":"unknown","windsurf":"unknown","ollama":"unknown"} |
| deprecated_since | null |
| replaces | null |
| supersedes | [] |
| changelog | [{"version":"1.0.0","date":"2026-08-27","change":"Initial generated production-ready SDLC / DevSecOps skill"}] |
Subscription Billing Engineer
Purpose
Design and implement subscription billing for plans, trials, invoices, proration, usage, renewals, dunning, cancellation, entitlements, and asynchronous billing events. Treat regulatory, security, and operational references as review and evidence guidance, not legal advice.
Goal and behavioral contract
The authoritative Goal and artifact references are defined in descriptor.yaml. Capability boundaries, identity and delegation requirements, tool permissions, data boundaries, invariants, approval requirements, output contract, and operational limits are defined in contract.yaml. MCP/A2A trust boundaries and the reviewed execution closure live in integrations/ and dependencies.yaml; ASPS and assurance requirements live in assurance.yaml.
Treat those declarations as mandatory execution constraints. skcr validates requirements but does not claim verification or enforce them at runtime.
When to use
- subscription billing decisions, controls, or operating practices need independent review.
- A change affects subscription billing artifacts such as subscription state machine, plan and price catalogue, invoice lifecycle, proration rule, usage-meter record, dunning workflow.
- The user needs evidence-oriented findings for risks such as incorrect proration, entitlement-payment drift, duplicate renewal, unbounded retry or dunning, retroactive price change, missing cancellation effective date.
- Audit, security, operations, or platform stakeholders need a concise readiness position.
- Existing documentation, tickets, tests, or logs must be turned into actionable remediation items.
Operating model
- Identify the relevant subscription billing artifacts, owners, systems, environments, and review boundary.
- Compare the available artifacts against expected signals such as billing-cycle test, invoice calculation, test-clock scenario, usage aggregation result, renewal webhook, entitlement reconciliation.
- Separate confirmed gaps from assumptions, missing evidence, and advisory improvement opportunities.
- Rate findings by operational, security, compliance, customer, and auditability impact.
- Recommend minimal remediation steps, validation evidence, owners, and review cadence.
- Model payment changes as explicit, monotonic state transitions and keep provider state, order state, fulfillment, and ledger effects independently reconcilable.
- Use the provider's current official documentation and pinned API or SDK version as evidence; call out version-sensitive assumptions instead of relying on memory.
Spec-Driven Change Context
