I know the properties exist on the companies as navigating to the companies on the site shows them on the page, and they are additionally listed in the response for the /properties/v1/companies/properties endpoint.
ps: the properties are returned as expected for the get all contacts endpoint (contacts/v1/lists/all/contacts/all)
You're definitely on the right track but there is a slight differences between the Get all companies API and Get all contacts API on how the query parameter is include to specific property in the return response.
For the Get all contacts API, to include other property aside from the default one, we use the &property parameter.
For the Get all companies API, to include other property aside from the default ones, we use the &properties parameter.
If you change the request url to something like this
You're definitely on the right track but there is a slight differences between the Get all companies API and Get all contacts API on how the query parameter is include to specific property in the return response.
For the Get all contacts API, to include other property aside from the default one, we use the &property parameter.
For the Get all companies API, to include other property aside from the default ones, we use the &properties parameter.
If you change the request url to something like this