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> Quick reference for the Dropbox Sign PHP SDK — install, authenticate, and find links to docs and examples.

# PHP SDK

The official Dropbox Sign PHP SDK is generated from our [OpenAPI specification](https://github.com/hellosign/hellosign-openapi/blob/main/openapi.yaml) and provides full API coverage.

## Install

```bash
composer require dropbox/sign
```

Package: [`dropbox/sign`](https://packagist.org/packages/dropbox/sign) on Packagist

## Authenticate

Configure credentials, then pass the configuration to API classes:

```php
$config = Dropbox\Sign\Configuration::getDefaultConfiguration();
$config->setUsername("YOUR_API_KEY");

$signatureRequestApi = new Dropbox\Sign\Api\SignatureRequestApi($config);
```

```php
$config = Dropbox\Sign\Configuration::getDefaultConfiguration();
$config->setAccessToken("YOUR_ACCESS_TOKEN");

$signatureRequestApi = new Dropbox\Sign\Api\SignatureRequestApi($config);
```

## Resources

* [GitHub repository](https://github.com/hellosign/dropbox-sign-php)
* [Per-method reference docs](https://github.com/hellosign/dropbox-sign-php/tree/main/docs/Api)
* [Working examples](https://github.com/hellosign/dropbox-sign-php/tree/main/examples)
* [Migration guide](/docs/sdks/migration-guides/php) (for users of the legacy `hellosign/hellosign-php-sdk`)