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

# API Headers

> Learn about our API request headers

We support two (2) types of headers for API requests:

1. `Content-Type`
2. `api-key`

## Content-Type

The `Content-Type` header specifies the format of your API request body. Setting it to `application/json` is essential for JSON-formatted requests, and prevents processing errors on our servers.

```json Example theme={null}
curl --request POST \
     --url 'https://path/to/example/endpoint' \
     --header 'Content-Type: application/json' \
     --data '
{
  "sample_parameter": "sample_value"
}
'
```

## Api-key

All endpoints require authorization before you can access them. We check your request header for the `api-key` to authorize your request. We discuss authorization in more detail here.

```json Example theme={null}
curl --request POST \
     --url 'https://path/to/example/endpoint' \
     --header 'api-key: {{YOUR_API_KEY}}' \
     --data '
{
  "sample_parameter": "sample_value"
}
'
```