Stripe Best Practices
fossasia/eventyay
Guides Stripe integration decisions across development and test environment planning (separate sandboxes vs the shared test mode sandbox), API selection (Checkout Sessions vs PaymentIntents)…
Runbook for the cmux billing code: Stripe Checkout, customer portal, subscription changes, webhooks and how Pro plan entitlement is resolved from Stack metadata.
Install cmux Billing Runbook
$ npx skills add manaflow-ai/cmux --skill cmux-billing -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install manaflow-ai/cmux cmux-billing --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/manaflow-ai/cmux.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/cmux-billing .claude/skills/cmux-billing && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "cmux-billing" agent skill from https://github.com/manaflow-ai/cmux/tree/main/skills/cmux-billing into .claude/skills/cmux-billing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cmux-billing", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/manaflow-ai/cmux/tree/main/skills/cmux-billingType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add manaflow-ai/cmux --skill cmux-billing -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install manaflow-ai/cmux cmux-billing --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/manaflow-ai/cmux.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/cmux-billing .agents/skills/cmux-billing && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "cmux-billing" agent skill from https://github.com/manaflow-ai/cmux/tree/main/skills/cmux-billing into .agents/skills/cmux-billing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cmux-billing", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add manaflow-ai/cmux --skill cmux-billing -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install manaflow-ai/cmux cmux-billing --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/manaflow-ai/cmux.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/cmux-billing .cursor/skills/cmux-billing && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "cmux-billing" agent skill from https://github.com/manaflow-ai/cmux/tree/main/skills/cmux-billing into .cursor/skills/cmux-billing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cmux-billing", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/manaflow-ai/cmux.git --path skills/cmux-billing--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add manaflow-ai/cmux --skill cmux-billing -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install manaflow-ai/cmux cmux-billing --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/manaflow-ai/cmux.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/cmux-billing .gemini/skills/cmux-billing && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "cmux-billing" agent skill from https://github.com/manaflow-ai/cmux/tree/main/skills/cmux-billing into .gemini/skills/cmux-billing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cmux-billing", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install manaflow-ai/cmux cmux-billingInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add manaflow-ai/cmux --skill cmux-billing -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/manaflow-ai/cmux.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/cmux-billing .github/skills/cmux-billing && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "cmux-billing" agent skill from https://github.com/manaflow-ai/cmux/tree/main/skills/cmux-billing into .github/skills/cmux-billing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cmux-billing", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add manaflow-ai/cmux --skill cmux-billing -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install manaflow-ai/cmux cmux-billing --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/manaflow-ai/cmux.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/cmux-billing .opencode/skills/cmux-billing && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "cmux-billing" agent skill from https://github.com/manaflow-ai/cmux/tree/main/skills/cmux-billing into .opencode/skills/cmux-billing/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cmux-billing", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
cmux-billing- GitHub stars
- 28k
- Token cost
- ~2.8k tokens
- SKILL.md length
- 1,427 words
- Files
- 1
- Skills in repo
- 22
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Runbook for the cmux billing code: Stripe Checkout, customer portal, subscription changes, webhooks and how Pro plan entitlement is resolved from Stack metadata.
- Editing or debugging Stripe Checkout creation for the Pro plan
- SKILL.md covers Architecture map, Dev workflow, Catalog and Feature flags, plus 2 more sections
- Calls bun and stripe; needs STRIPE_SECRET_KEY
- Tracing why an account shows or lacks Pro status
What it does
This skill is a read-before-editing guide to the cmux billing stack, covering pricing, Stripe Checkout, subscriptions, webhooks and Pro entitlement. Its architecture map explains that the checkout route creates Stripe Checkout Sessions for Pro when the Stripe secret key is set, ties each session to the Stack user ID, creates an anonymous Stack user for signed-out buyers, and falls back to the older Stack purchase path when Stripe is unset or the plan is team.
Other routes create customer portal sessions that return to the pricing page and cancel or resume an active Pro subscription, while a dashboard page shows localized plan state. A shared recorder in `web/services/billing/purchase.ts` is idempotent and serves both the completion route and the Stripe webhook; it attaches the purchaser's email, records email claims on conflict and never grants access based on an unverified email. VM code reads the plan from Stack client-read-only metadata, where an operator override takes precedence over the Stripe-mirrored plan, and the portal link stays Stripe-only.
When your agent uses it
- Editing or debugging Stripe Checkout creation for the Pro plan
- Tracing why an account shows or lacks Pro status
- Changing webhook handling or subscription recording
- Working on the pricing page or billing dashboard
Example prompts
- “Why does a signed-out buyer end up with an anonymous user after checkout? Walk me through the checkout route.”
- “A customer paid but still shows as free. Trace how the webhook records the subscription and sets the plan.”
- “Check that the subscription route cancels and resumes the Pro plan correctly.”
Requirements
- A Stripe secret key for Stripe-backed checkout
- The cmux web codebase
What it can do on your machine
Read from SKILL.md and the folder at commit 1e82fa4. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
bunstripe
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names these keys or tokens, usually read from environment variables:
STRIPE_SECRET_KEY
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
cmux Billing Runbook loads about 2.8k tokens when it runs. Until then it costs about 71 tokens; SKILL.md has 1,427 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,427 words (~2,849 tokens).
“Read before changing billing, pricing, Stripe, Pro entitlement, checkout, webhook, or subscription code.”
- name
- cmux-billing
Files
Just SKILL.md in skills/cmux-billing of manaflow-ai/cmux.
Open the folder on GitHubat commit 1e82fa4
Compare with similar skills
cmux Billing Runbook next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| cmux Billing Runbook this skillmanaflow-ai/cmux | 28k | — | ~2.8k | Automated safety check: Pass | Custom licence | |
| Stripe Best Practicesfossasia/eventyay | 1.7k | 1 repos | ~1.7k | Automated safety check: Pass | Apache-2.0 | |
| Stripe Patternsbybren-llc/safe-agentic-workflow | 423 | — | ~1.2k | Automated safety check: Pass | MIT | |
| Stripe Integration Expertalirezarezvani/claude-skills | 28k | 1 repos | ~3.7k | Automated safety check: Pass | MIT | |
| Payment Integrationaiskillstore/marketplace | 433 | 8 repos | ~916 | Automated safety check: Pass | None | |
| Stripe Patternsbybren-llc/safe-agentic-workflow | 423 | — | ~1.1k | Automated safety check: Pass | MIT |
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Works with
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Questions about cmux Billing Runbook
What does cmux Billing Runbook do?
Runbook for the cmux billing code: Stripe Checkout, customer portal, subscription changes, webhooks and how Pro plan entitlement is resolved from Stack metadata. This skill is a read-before-editing guide to the cmux billing stack, covering pricing, Stripe Checkout, subscriptions, webhooks and Pro entitlement. Its architecture map explains that the checkout route creates Stripe Checkout Sessions for Pro when the Stripe secret key is set, ties each session to the Stack user ID, creates an anonymous Stack user for signed-out buyers, and falls back to the older Stack purchase path when Stripe is unset or the plan is team.
When should I use cmux Billing Runbook?
cmux Billing Runbook fits situations like: editing or debugging Stripe Checkout creation for the Pro plan; tracing why an account shows or lacks Pro status; changing webhook handling or subscription recording; working on the pricing page or billing dashboard.
How do I install cmux Billing Runbook in Claude Code?
Run `npx skills add manaflow-ai/cmux --skill cmux-billing -a claude-code`. Or copy the skill folder (skills/cmux-billing in manaflow-ai/cmux) into .claude/skills/cmux-billing in your project. Claude Code loads it when a task matches its description.
How do I install cmux Billing Runbook in Codex?
Run `npx skills add manaflow-ai/cmux --skill cmux-billing -a codex`. Or copy the skill folder (skills/cmux-billing in manaflow-ai/cmux) into .agents/skills/cmux-billing in your project. Codex loads it when a task matches its description.
Can I use cmux Billing Runbook in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add manaflow-ai/cmux --skill cmux-billing -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cmux-billing, .gemini/skills/cmux-billing, .github/skills/cmux-billing and .opencode/skills/cmux-billing in your project.
What does cmux Billing Runbook need to run?
Going by SKILL.md and its folder, cmux Billing Runbook needs the command-line tools its instructions call (bun and stripe) and credentials named STRIPE_SECRET_KEY. Our summary lists: A Stripe secret key for Stripe-backed checkout; The cmux web codebase.
Does cmux Billing Runbook access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is cmux Billing Runbook safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does cmux Billing Runbook use?
cmux Billing Runbook has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does cmux Billing Runbook use?
About 2.8k tokens (SKILL.md is roughly 11k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to cmux Billing Runbook?
Skills that share tags, products or a category with cmux Billing Runbook: Stripe Best Practices (fossasia/eventyay, 1.7k stars), Stripe Patterns (bybren-llc/safe-agentic-workflow, 423 stars), Stripe Integration Expert (alirezarezvani/claude-skills, 28k stars) and Payment Integration (aiskillstore/marketplace, 433 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains cmux Billing Runbook?
manaflow-ai (a GitHub organization) maintains it in manaflow-ai/cmux, which has 28,092 GitHub stars. The repository holds 22 skills in this directory. The repository was last updated on October 11, 2026.
Source: manaflow-ai/cmux on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.