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

# API Reference

> REST over HTTPS. JSON in, JSON out. HMAC-signed.

The Zennopay API has two environments:

<CodeGroup>
  ```bash Production theme={null}
  https://api.zennopay.com/v1
  ```

  ```bash Sandbox theme={null}
  https://api.sandbox.zennopay.com/v1
  ```
</CodeGroup>

Sandbox credentials are issued during onboarding. See
[Environments](/api-reference/environments) for the full URL reference, key
scoping rules, and the path from sandbox to production.

## Conventions

* **Transport:** HTTPS only. TLS 1.2+.
* **Request bodies:** JSON, UTF-8.
* **Responses:** JSON. Errors follow a consistent envelope (`error.code`,
  `error.message`, `error.request_id`).
* **Auth:** every request must be HMAC-signed. See [Authentication](/authentication).
* **Money:** all amounts are integer USD cents (`amount_usd_cents`). We never
  return floating-point dollars.
* **Idempotency:** the HMAC nonce + timestamp combination is rejected on
  replay (within a 10-minute window). For application-level idempotency, use
  your own request ID and check intent state before retrying.

## Endpoints

<CardGroup cols={2}>
  <Card title="Create payment intent" icon="plus" href="/api-reference/payment-intents/create">
    `POST /v1/payment_intents`
  </Card>

  <Card title="Get payment intent" icon="magnifying-glass" href="/api-reference/payment-intents/get">
    `GET /v1/payment_intents/{intent_id}`
  </Card>

  <Card title="Webhooks" icon="webhook" href="/api-reference/webhooks">
    Event types + signature verification
  </Card>
</CardGroup>