Always get 204 when trying to get Related Record with PHP API

Always get 204 when trying to get Related Record with PHP API

Hi everyone,

we have the following problem. We have the following Lookup Field for the Leads:


The API name for the related list is defined as "hafner_list":


A test lead looks like this:



When I use the PHP SDK as here:

  1. $id = "357036000000258721"; // id of Testendverbraucher
    $relatedId = "357036000000258720"; // id of Max Hafner
    $operations = new RelatedRecordsOperations('hafner_list', 'Leads');
    $headerInstance = new HeaderMap();
    $record = $operations->getRelatedRecord($relatedId, $id, $headerInstance);

I always get a 204 error.

What am I doing wrong?