Your Stripe integration
— tested against reality, not mocks.
Drop-in mirrors for Stripe, Resend, Twilio, and the rest of your application infrastructure. Real webhooks, real state, real errors — without the real-world side effects. Point your code at a Mirra URL and it just works.
Built for the way code gets written now
Works with your agents. And your engineers.
- Claude Code
- Cursor
- Copilot
- Cline
- MCP
Any tool that speaks MCP gets full access to your mirrors.
Third-party integration bugs are the
#1 production incident that passes code review.
Every modern product is an integration product. Ten to thirty third parties under one release. Three ways to test them — all broken. Teams running on Mirra ship 80% fewer of these bugs to production.
No. 1
Mocks lie.
Nobody signs webhooks correctly. Nobody enforces idempotency. State machines drift. Tests pass against the mock — then production breaks because the mock was wrong.
No. 2
Real APIs bite.
Vendor test modes weren't built for this. Twilio sends real SMS. Resend sends real email that affects your domain reputation. Slack sends real messages to real channels. Plaid has no clean way to test bank integrations at all. Running a thousand parallel CI sessions against real vendors isn't financially or operationally safe.
No. 3
Shared staging collides.
One environment breaks past five engineers. State collides. External integrations are disabled to stop the bleeding — so payments, email, and messaging silently drift wrong.
One command.
Your stack, mirrored.
Mirra detects the third parties your code talks to and boots a faithful, stateful mirror for each — in under two seconds. A TLS proxy routes calls transparently, so your existing SDK clients work without URL changes.
$mirra up
Local dev & staging.
Provision mirror URLs for the third parties your code talks to. Keep them running as long as you need.
$mirra run <scenario.md>
CI & agent validation.
Execute a markdown scenario against provisioned mirrors. Get a satisfaction score, gate the PR.
$withMirra() in Vitest
Drop into your suite.
One config wrapper and your existing Vitest tests run against mirrors. No code changes.
Not a mock.
A running mirror.
01 / Stateful
Running databases, not hardcoded fakes.
Send an email — it shows up in the inbox. Subscribe a user — their lifecycle runs through trial, active, past_due. Charge a card — the webhook fires with the right signature on the right schedule.
SQLite per session · state survives requests
02 / Faithful
Byte-for-byte vendor parity.
Same error payloads. Same webhook signatures. Same rate-limit responses. Same idempotency. Same state-machine transitions.
HMAC-SHA256 · webhook sigs match vendor spec
03 / Isolated
Every session, its own world.
A thousand parallel CI runs don't see each other's state. Tests are deterministic. Teardown is instant.
container per session · zero cross-talk
The application infrastructure
your product is actually made of.
Payments, email, SMS, auth, commerce, databases, inference. Mirra mirrors the vendors your product depends on — Stripe, Resend, Twilio, Auth0, Plaid, and the rest.
Drift detection · 7-day detect · 14-day fix SLA on every mirror
| Vendor | Method | Path | Status | Duration |
|---|---|---|---|---|
| Stripe | POST | /v1/customers | 201 | 42ms |
| Resend | POST | /emails | 202 | 68ms |
| Twilio | POST | /2010-.../Messages | 201 | 54ms |
| Postgres | INSERT | users.create | OK | 12ms |
| Stripe | ▶ | webhook.evt_3NxK… signed | — | 2.2s |
Coding agents guess the world.
Mirra lets them see it.
Claude Code, Cursor, Copilot — they guess at Stripe's webhook format, Twilio's retry semantics, Resend's bounce callbacks. Their training data is a snapshot of the world from 2023. Mirra exposes every mirror through a Model Context Protocol server at mcp.mirra.run, so the agent verifies behavior inside the same session it's writing the code in. No more hallucinated integrations shipping to production.
MCP server, native.
Mirra exposes every mirror through a Model Context Protocol server. Claude Code, Cursor, Copilot agent mode, and any MCP-compatible tool can spin up mirrors, introspect state, fire requests, and inspect responses — inside the same session they're writing the code in.
MCP-compatible · works with Claude Code, Cursor, Cline
Verified, not guessed.
The agent sees real response shapes, real error payloads, real webhook signatures. It writes code grounded in the mirror's actual behavior — not its training data's best guess at what Stripe returned in 2023.
real response shapes · real webhook signatures · real state
Tests that catch what matters.
When the agent writes unit and integration tests, they run against the mirror's state machine — not mocks the agent invented to pass. The tests that ship are tests that actually protect you.
state transitions · idempotency · retries · vendor-correct signatures
Coding Agent
Mirra MCP
4 mirrors active
Verified Code
Start in your terminal,
in minutes.
Free tier, no card. Mirrors ready in under two seconds.
Pro $20/mo · 1,000 minutes · no hard caps
