Documentation

Build churn recovery into your product

Recover failed payments, run a click-to-cancel flow and win customers back. Connect Stripe in one click, a supported billing tool, or any billing through the REST API.

Quickstart API reference

$ curl https://api.nochurn.sh/v1/customers \
  -H "Authorization: Bearer nc_test_…"

Test mode by default: nc_test_ keys never retry a real payment and no email leaves NoChurn.

Start here

01Quickstart A test key, a first call, your billing, then the cancel flow.
02Concepts Test and live mode, the three customer ids, events and the four flows.
03API reference Every public endpoint, with examples in curl, Node, Python and Ruby.

Guides

Your own billing (API)Send subscriptions and payment attempts when you do not bill with Stripe.
Cancel modalThe signed customer token and the headless cancel flow, with click to cancel.
In-app banner and wallWhat your app shows after a failed payment or during a pause.
Access checkThe server-side check behind the banner and the wall.
Custom dataYour own attributes and usage events, for the churn score and drivers.
WebhooksReceive NoChurn’s events and verify their signature.
ChargebacksDisputes, evidence and early fraud warnings.
Test mode and sandboxPlay a customer’s life in test mode and run the checklist.

✦ MCP

Let a coding agent do the integration

Connect the NoChurn MCP server to Claude Code, Cursor or another agent. It works in test mode and asks a person before anything goes live.

AI apps and MCP

Reference

ErrorsEvery error code, when it happens and how to fix it.
Webhook eventsEvery event type, with an example payload.
IntegrationsWhat NoChurn does with each billing tool and help desk.

Works with

Stripe
Chargebee
Recurly
Maxio
Zuora
Paddle
Lemon Squeezy
Polar
Braintree
Mollie
GoCardless
Razorpay
App Store
Google Play
Any billing, by API

Base URL

https://api.nochurn.sh

Every endpoint is under /v1. Requests and responses are JSON; amounts are in cents.