> ## 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.

# TheirStack - How do I link my account?

# Overview

To authenticate with TheirStack, you will need:

1. **API Key** - A secret key used to authenticate requests to the TheirStack API.

This guide will walk you through generating your API key in TheirStack.

### Prerequisites

* A TheirStack account with access to **Settings → API Keys**.

### Instructions

#### Step 1: Generate your API key

1. Log in to your TheirStack account.
2. Navigate to **Settings → API Keys**.
3. Click **Create API key**.

<img src="https://mintcdn.com/nango/ed3Cvr_KhnwHKLNS/api-integrations/theirstack/create_api_key.png?fit=max&auto=format&n=ed3Cvr_KhnwHKLNS&q=85&s=ebae2f007a6cff263e288ce32dd23518" width="1916" height="761" data-path="api-integrations/theirstack/create_api_key.png" />

4. Give your key a name and choose an expiration policy — either a specific date or **Never**. We recommend choosing a long expiration or no expiration to avoid unexpected disruptions.

<img src="https://mintcdn.com/nango/ed3Cvr_KhnwHKLNS/api-integrations/theirstack/api_key_form.png?fit=max&auto=format&n=ed3Cvr_KhnwHKLNS&q=85&s=4e594a61c331ce68a686ce5517229492" width="1916" height="761" data-path="api-integrations/theirstack/api_key_form.png" />

5. Copy your API key and store it somewhere safe. For security reasons, the key is only shown once.

<img src="https://mintcdn.com/nango/ed3Cvr_KhnwHKLNS/api-integrations/theirstack/generated_api_key.png?fit=max&auto=format&n=ed3Cvr_KhnwHKLNS&q=85&s=952310cf93c17a8d8e12aa6a1184c185" width="1916" height="761" data-path="api-integrations/theirstack/generated_api_key.png" />

#### Step 2: Enter your API key in the Connect UI

Once you have your **API Key**:

1. Open the form where you need to authenticate with TheirStack.
2. Enter your **API Key** in the designated field.
3. Submit the form, and you should be successfully authenticated.

<img src="https://mintcdn.com/nango/ed3Cvr_KhnwHKLNS/api-integrations/theirstack/form.png?fit=max&auto=format&n=ed3Cvr_KhnwHKLNS&q=85&s=14ccedd4de13ee916a3b6af413a9667c" style={{maxWidth: "450px" }} width="502" height="700" data-path="api-integrations/theirstack/form.png" />

You are now connected to TheirStack.