# Authentication

Use a self-contained API key with the Bearer scheme.

## HTTP Header

Include your key in the `Authorization` header.

#### cURL

```bash
curl -H "Authorization: Bearer sk_test_..." https://api.medsender.com/api/v2/fax_numbers
```

#### Node

```javascript
const API_BASE='https://api.medsender.com/api/v2';
const API_KEY='sk_test_...';

const res = await fetch(`${API_BASE}/fax_numbers`, {
  headers: { Authorization: `Bearer ${API_KEY}` }
});
console.log(await res.json());
```

#### TypeScript

```typescript
const API_BASE: string='https://api.medsender.com/api/v2';
const API_KEY: string='sk_test_...';

const res = await fetch(`${API_BASE}/fax_numbers`, {
  headers: { Authorization: `Bearer ${API_KEY}` }
});
console.log(await res.json());
```

#### Python

```python
import requests
API_BASE='https://api.medsender.com/api/v2'
API_KEY='sk_test_...'

r=requests.get(f"{API_BASE}/fax_numbers", headers={'Authorization':f'Bearer {API_KEY}'})
print(r.json())
```

#### Ruby

```ruby
require 'net/http'
require 'uri'
uri = URI.parse('https://api.medsender.com/api/v2/fax_numbers')
req = Net::HTTP::Get.new(uri)
req['Authorization'] = 'Bearer sk_test_...'
res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true){|http| http.request(req)}
puts res.body
```

#### PHP

```php
<?php
$ch = curl_init();
curl_setopt_array($ch, [
  CURLOPT_URL => 'https://api.medsender.com/api/v2/fax_numbers',
  CURLOPT_HTTPHEADER => ['Authorization: Bearer sk_test_...'],
  CURLOPT_RETURNTRANSFER => true
]);
$res = curl_exec($ch);
echo $res;
```

#### Java

```java
import java.net.http.*;
import java.net.URI;
public class AuthHeader {
  public static void main(String[] args) throws Exception {
    var client = HttpClient.newHttpClient();
    var req = HttpRequest.newBuilder()
      .uri(URI.create("https://api.medsender.com/api/v2/fax_numbers"))
      .header("Authorization","Bearer sk_test_...")
      .GET()
      .build();
    var res = client.send(req, HttpResponse.BodyHandlers.ofString());
    System.out.println(res.body());
  }
}
```

#### C#

```csharp
using System;
using System.Net.Http;
var url = "https://api.medsender.com/api/v2/fax_numbers";
using var client = new HttpClient();
client.DefaultRequestHeaders.Add("Authorization","Bearer sk_test_...");
var res = await client.GetAsync(url);
Console.WriteLine(await res.Content.ReadAsStringAsync());
```

### Environments

- Test: keys start with `sk_test_`; use for development and sandbox data.
- Live: keys start with `sk_live_`; use for production.