# Authorization

## API Authentication

Authentication is done using an API key and a secret key. To generate this pair, read [API Setup](/integration-guide/api-setup.md).

As an example, we will use the "/payment/v1/requestPaymentAddress" endpoint to show how to authenticate. This can be used for all endpoints that requires authentication.

These are encoded as HTTP headers named:

* x-nonce
* x-api-key
* x-signature

### Code Example

{% tabs %}
{% tab title="Javascript" %}

```javascript
require("isomorphic-fetch");
const crypto = require("crypto");

async function sendRequest() {
  const apiKey = "YOUR_API_KEY";
  const apiSecret = "YOUR_API_SECRET";

  const path = "/payment/v1/requestPaymentAddress";
  const nonce = Date.now().toString();
  const httpMethod = "POST";

  const signatureContent = JSON.stringify({
    httpMethod,
    path,
    nonce,
  });

  const sig = crypto
    .createHmac("sha384", apiSecret)
    .update(signatureContent)
    .digest("hex");

  try {
    const res = await fetch(`https://api-staging.aquanow.io${path}`, {
      method: httpMethod,
      headers: {
        "x-nonce": nonce,
        "x-api-key": apiKey,
        "x-signature": sig,
      },
      body: JSON.stringify({
        cryptoType: "BTC",
        fiat: "CAD",
        fiatReceivable: 5,
        subaccount: "YOUR_CUSTOM_PAYMENT_ID",
      }),
    });
    if (res.status !== 200) {
      throw new Error(`${(await res.json()).message} status ${res.status}`);
    }
    const result = await res.json();
    console.log("Result: ", result);
  } catch (error) {
    console.log("error", error);
  }
}

sendRequest();
```

{% endtab %}

{% tab title="PHP" %}

```php
<?php require_once 'vendor/autoload.php';
use GuzzleHttp\Client;
$method = 'GET';
$endpoint = '/payment/v1/payment';
$nonce = round(microtime(true) * 1000);
$apiKey = 'YOUR_API_KEY';
$apiSecret = 'YOUR_API_SECRET';
$content = [
    'httpMethod' => $method,
    'path' => $endpoint,
    'nonce' => (string) $nonce,
];
$json = json_encode($content, JSON_UNESCAPED_SLASHES);
$signature = hash_hmac('sha384', $json, $apiSecret);

$client = new Client([
    'base_uri' => 'https://api-staging.aquanow.io',
    'headers' => [
        'x-nonce' => $nonce,
        'x-api-key' => $apiKey,
        'x-signature' => $signature,
    ],
]);

try {
    $response = $client->request('GET', $endpoint, [
        'query' => [
            'startTime' => 1628654316000,
            'endTime' => 1628654346000,
        ],
    ]);

    echo $response->getBody();
} catch (RequestException $error) {
    echo $error
        ->getResponse()
        ->getBody()
        ->getContents();
} catch (\Exception $error) {
    echo $error->getResponse()->getBody();
}

```

{% endtab %}
{% endtabs %}

### Common Auth Errors

#### 401

HTTP401 usually happens when invalid auth credentials are in the request auth headers. You will also receive 401 when `nonce` in calculating auth credentials are outdated.&#x20;

#### 403

HTTP403 usually happens when a request is blocked by IP whitelist or an incorrect URL/HTTP method.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.aquapay.io/integration-guide/authorization.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.