When using the official PHP SDK (which is generated by OpenAPI), I have found that the Request Bodies don’t considder the custom Fields. In my Opinion you should add the custom fields as property to the requests, so that when using the proper Object Oriented Syntax everything works as expected, because when I use an Array instead of the specific Class everything works. (but took me a while to debug this)
Here is an example:
$organization_request_body = new \Pipedrive\versions\v2\Model\OrganizationRequestBody(['custom_fields' => ['42[random]asl' => 'dummy', '57[random]asl' => 137]);
$result = $apiInstance->updateOrganization($id, $organization_request_body);
print_r($result); // -> success, but custom fields did not change
$organization_request_body = ['custom_fields' => ['42[random]asl' => 'dummy', '57[random]asl' => 137]; //standard array
$result = $apiInstance->updateOrganization($id, $organization_request_body);
print_r($result); // -> success and custom fields did change
Will open an Issue on GitHub as well…
Kind regards,
Christian