API Should not return 404 on input error

[tarjei]

Version info

• intercom-php version: 4.4
• Intercom API version: 2.2
• PHP version:7.4

Expected behavior

400 bad request

Actual behavior

404 not found

Steps to reproduce (as granular as possible, including screenshots where appropriate)

1. $this->intercomClient is the intercom/intercom-php client.
2. Given:

$this->intercomClient->post('contacts/merge', [
            'from' => $fromId,
            'to' => $toId,
        ]);

3. I get: EXCEPTION: Not Found 404 Http\Client\Common\Exception\ClientErrorExceptionHeaders: {"Host":["api.intercom.io"],"Accept":["application/json"],"Content-Type":["application/json"],"User-Agent":["Intercom-PHP/4.4.0"],"Intercom-Version":["2.2"],"Authorization":["Bearer xxx"]} https://api.intercom.io/contacts/merge

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