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

# PHP SDK advanced usage

> Response data access, SSL/TLS compatibility and configuration, development workflow, and plugin development for the Telnyx PHP SDK.

## Advanced concepts

### Making custom or undocumented requests

#### Undocumented properties

You can send undocumented parameters to any endpoint, and read undocumented response properties, like so:

Note: the `extra*` parameters of the same name overrides the documented parameters.

```php theme={null}
<?php

$numberOrder = $client->numberOrders->create(
  phoneNumbers: [['phoneNumber' => '+15558675309']],
  requestOptions: [
    'extraQueryParams' => ['my_query_parameter' => 'value'],
    'extraBodyParams' => ['my_body_parameter' => 'value'],
    'extraHeaders' => ['my-header' => 'value'],
  ],
);
```

#### Undocumented request params

If you want to explicitly send an extra param, you can do so with the `extra_query`, `extra_body`, and `extra_headers` under the `request_options:` parameter when making a request, as seen in the examples above.

#### Undocumented endpoints

To make requests to undocumented endpoints while retaining the benefit of auth, retries, and so on, you can make requests using `client.request`, like so:

```php theme={null}
<?php

$response = $client->request(
  method: "post",
  path: '/undocumented/endpoint',
  query: ['dog' => 'woof'],
  headers: ['useful-header' => 'interesting-value'],
  body: ['hello' => 'world']
);
```