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

# Hyperline - How do I link my account?

## Overview

To authenticate with Hyperline, you need:

1. **Environment** — the Hyperline API host: production or sandbox (test mode).
2. **API Key** — a Hyperline API key for that environment.

This guide will show you how to get them.

### Prerequisites

* A Hyperline account with admin access. Only Hyperline admins can create API keys.

### Step 1: Choose your environment

Hyperline has separate production and sandbox environments. Select the one your API key belongs to:

| Environment | Key prefix | Value to select |
| - | - | - |
| Production | `prod_` | `api.hyperline.co` |
| Sandbox (test mode) | `test_` | `sandbox.api.hyperline.co` |

A sandbox key only works with `sandbox.api.hyperline.co`, and a production key only with `api.hyperline.co`.

### Step 2: Create an API key

1. Sign in to Hyperline as an admin. For a sandbox key, switch your account to test mode first.
2. Go to **Settings**, section [API](https://app.hyperline.co/app/settings/api).
3. Click **+ New API key**.
4. Enter a name for the key and select its scopes. In most cases you need read/write access.
5. Copy the key and store it somewhere safe. You won't be able to see it again in Hyperline.

Production keys start with `prod_` and sandbox keys with `test_`. See [Authentication](https://docs.hyperline.co/developers/authentication) for details.

### Step 3: Enter your credentials in the Connect UI

1. Open the form where you need to authenticate with Hyperline.
2. Select your **Environment** and enter your **API Key** in the designated fields.
3. Submit the form, and you should be successfully authenticated.

![Hyperline connection form in the Nango Connect UI](https://mintcdn.com/nango/drzywdmwflsCbIcV/api-integrations/hyperline/form.png?fit=max\&auto=format\&n=drzywdmwflsCbIcV\&q=85\&s=b4d928e96ca935e55fb7ffd537020db9)

You are now connected to Hyperline.


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