> ## Documentation Index
> Fetch the complete documentation index at: https://nombasub.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Production Checklist

> Prepare your subscription integration for live billing.

# Production Checklist

## Before going live

* Store your Subscriptions Engine API key securely.
* Never expose API keys in frontend code.
* Use HTTPS for all API calls and webhook URLs.
* Configure your merchant webhook endpoint.
* Verify webhook signatures when signing is configured.
* Make webhook handlers idempotent.
* Never store full card details.
* Reconcile invoice and payment webhook events in your system.
* Monitor failed payments and paused subscriptions.
* Test plan creation, customer creation, checkout, payment success, and payment failure.
* Confirm settlement/account mapping with the platform team.

## Operational monitoring

Track:

* Checkout creation failures.
* Payment failures.
* Webhook delivery failures.
* Customers with paused subscriptions.
* Revenue by plan in your own reporting system.

## Webhook readiness

Before live traffic, make sure your webhook endpoint:

* Returns 2xx quickly.
* Handles duplicate webhook IDs safely.
* Logs event type, webhook ID, tenant ID, and timestamp.
* Does not block customer access updates on slow downstream jobs.