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

# Authentication & API Keys

GreenBanana authenticates your API requests using your account’s API keys. Each account has two API keys for authentication:

| Key                  | Example         | When to Use                                                                                                                              |
| -------------------- | --------------- | ---------------------------------------------------------------------------------------------------------------------------------------- |
| Secret key (API-key) | `snd_c69***`    | Used to authenticate API requests from your merchant server. **Don’t expose this key** on a website or embed it in a mobile application. |
| Publishable key      | `pk_snd_3b3***` | Used to authenticate API requests from your app’s client. Can be publicly-accessible in your web or mobile app’s client-side code.       |

<Check>
  Get your [Test API key](https://app.staging.bnplx.io/developers?tabIndex=1) and
  [Publishable Key](https://app.staging.bnplx.io/home)
</Check>