Unable to send PATCH for custom objects

We are attempting to update custom objects following the documentation for updated by external id (https://developer.zendesk.com/api-reference/custom-data/custom-objects/custom_object_records/#set-custom-object-record-by-external-id-or-name)

However, the only way to send a PATCH method is to do something like this:

$client->post($url, $data, ['method' => 'PATCH']);

But when I try that, I'm getting this error:

An error occurred calling API. Error: Client error: `POST https://bubblebinzfranchisellc.zendesk.com/api/v2/custom_objects/service_request/records?external_id=20693` resulted in a `422 Unprocessable Entity` response:
{"error":"RecordInvalid","description":"Record validation errors","details":{"external_id":[{"description":"This externa (truncated...)
 [details] {"error":"RecordInvalid","description":"Record validation errors","details":{"external_id":[{"description":"This external ID is already in use."}]}}

So I looked into the HttpClient class and check the post method there. You have the array_merge backwards I think. The $options being sent in containing 'method' => 'PATCH' is getting overridden by the POST method in the second array.

        $extraOptions = array_merge($options, [
            'postFields' => $postData,
            'method' => 'POST'
        ]);

In my local system, I modified the class and reversed it as such:

        $extraOptions = array_merge([
            'postFields' => $postData,
            'method' => 'POST'
        ], $options);

And it works perfectly fine. But I don't have a way to do that on the server because this is controlled by composer.

Can you please make this adjustment ASAP?

Start in the HttpClient class and inspect the post method's option merging, reproducing the PATCH request described in the issue. Verify that the requested method is preserved instead of being treated as POST, then confirm the custom-object update no longer produces the duplicate external-ID validation error.