Most endpoints support a
_fields parameter that lets you specify which fields you require in the response. For example, if you only need
display_name when listing Leads, add
?_fields=id,display_name to the URL. This will improve performance of your API calls.
In some cases, an API response can include fields that are not listed in the sample response for that endpoint below. Non-custom fields that are not included in the sample response for an endpoint should not be used in integrations, as they may change without warning.