# Add subscribers to ConvertKit

> Formspree Docs · Using the CLI · Updated July 14, 2023

The **apply tags** action adds a subscrber to ConvertKit and applies one or more tags. Under the hood, this action calls the [**tag a subscriber**](https://developers.convertkit.com/#tag-a-subscriber) API endpoint. If the call fails, we'll retry it for you.

Adding the **apply tags** action in the `formspree.json` file has the same effect as adding the ConvertKit plugin in the Formspree dashboard.

## Formspree.json configuration

| Key | Type | Description |
| --- | --- | --- |
| `app` |  String |  Must be `convertkit`  |
| `type` |  String |  Must be `applyTags` |
| `tags` |  Array |  A list of tags to apply to the subscriber (required) |
| `apiKey` |  String |  Your ConvertKit API key found [here](https://app.convertkit.com/account/edit) (must be an $ env variable reference, required) |

**Example**

```javascript
{
  "forms": {
    "contact": {
      "name": "Contact Form",
      "actions": [
        {
          "app": "convertkit",
          "type": "applyTags",
          "tags": ["Newsletter"],
          "apiKey": "$CONVERTKIT_API_KEY"
        }
      ]
    }
  }
}
```

## Validation rules

The **apply tags** action adds the following validation rules implicitly:

| Field | Validation Rule |
| --- | --- |
| `email` | Required |
| `email` | Type is `email` |