> ## 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.

# Cardly - How do I link my account?

## Overview

To authenticate with Cardly, you need:

1. **API Key** — a test (`test_`) or live (`live_`) API key from your Cardly business portal.

This guide will show you how to create it.

### Prerequisites

* A Cardly business account. If you don't have one, [sign up](https://www.cardly.net/business/signup) and confirm your email address. Standard business accounts have no mandatory paid subscription.

### Step 1: Create an API key

1. Log in to your Cardly business portal.
2. In the menu bar, open **Integrate** and click **API Keys**.

![Cardly business portal with the Integrate menu open and API Keys highlighted](https://mintcdn.com/nango/OsskBshdjtct8XPs/api-integrations/cardly/integrate_api_keys_menu.png?fit=max\&auto=format\&n=OsskBshdjtct8XPs\&q=85\&s=c6322863b2df13b8d9ec22d9f7ae7c2a)

3. On **Manage API Keys**, click **New API Key**.

![Cardly Manage API Keys page with the New API Key button](https://mintcdn.com/nango/OsskBshdjtct8XPs/api-integrations/cardly/manage_api_keys_new.png?fit=max\&auto=format\&n=OsskBshdjtct8XPs\&q=85\&s=77bb475da5a90909d0909db8b5a7ab9d)

4. A new key row appears with two keys:
   * **Development**: the test key, prefixed with `test_`. It can do everything a live key can but never performs mutations, so it never places real orders.
   * **Production**: the live key, prefixed with `live_`. It has no restrictions and places real orders.
5. To use the test key, click the copy icon next to **Development**.

![Cardly API key row with the copy icon next to the Development key](https://mintcdn.com/nango/K6m841_Q0Jj98N-O/api-integrations/cardly/api_key_created.png?fit=max\&auto=format\&n=K6m841_Q0Jj98N-O\&q=85\&s=d52566a968e2afd24437327db0b67fac)

6. To use the live key, open **Actions** > **Reveal** on the key row, then click the copy icon next to **Production**.

![Cardly API key row with the copy icon next to the Production key](https://mintcdn.com/nango/OsskBshdjtct8XPs/api-integrations/cardly/live_api_key_created.png?fit=max\&auto=format\&n=OsskBshdjtct8XPs\&q=85\&s=e6f463a346dd3892540c0f2fb9788e92)

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

1. Open the form where you need to authenticate with Cardly.
2. Enter your test or live key in the **API Key** field.
3. Submit the form, and you should be successfully authenticated.

![Cardly Connect UI form with the API Key field](https://mintcdn.com/nango/K6m841_Q0Jj98N-O/api-integrations/cardly/form.png?fit=max\&auto=format\&n=K6m841_Q0Jj98N-O\&q=85\&s=06cbeb1e0f87f35d776e567b4803acc1)

You are now connected to Cardly.


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