Field meta_data cannot be cleared because empty array is not converted to {}

[vmary-fig]

Description of the Bug

When updating a customer, the meta_data field (a JSON object) cannot be cleared.
Passing an empty PHP array ([]) to meta_data causes the SDK to throw an exception instead of sending {} to the API.

This makes it impossible to delete existing metadata on a customer.

Steps to reproduce

$data['meta_data'] = [];
$this->client->customer()->update($customerId, $data)->customer;

Actual behavior

{
    "error": "Invalid request exception",
    "message": "meta_data : wrong format",
    "internal_code": 12
}

Expected Behavior

The SDK should serialize [] as {} for fields of type jsonobject using https://www.php.net/manual/en/json.constants.php#constant.json-force-object
The request should clear the metadata on the customer.

Code Snippets (if applicable)

Operating System

ubuntu

Language version

PHP 8.1

Library version

v4.10

Additional context

No response