# Technical Overview

See the [complete API reference](https://docs.encharge.io/transactional-email-api/reference). Alternatively, check the [API documentation](https://documenter.getpostman.com/view/460427/TVRj5o3E) in Postman.

The Transactional Email API:

* Accepts and outputs **JSON**.
* **Authenticates** using API key passed via the `token` query parameter or the `X-Encharge-Token` header. Get your API key from [your Account](https://app.encharge.io/account/info).
* Returns **202 Accepted** on success.
* Returns descriptive error messages with meaningful HTTP response codes. The response has the following format:

```javascript
{
    "error": {
        "message": "Missing email content. Please pass `template`, `html` or `text`",
        "markdown": "<p>Missing email content. Please pass <code>template</code>, <code>html</code> or <code>text</code></p>\n",
        "traceId": "9751fe70-0957-11eb-a6b8-3baf67de29f8"
    }
}

```