Custom Field Schemas

Returns all Custom Fields for a given object type in the order you have defined.
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A Custom Field Schema presents you with all (regular and shared) Custom Fields that belong on a given object, in the order you’ve defined. It’s the best endpoint to use when asking “What Custom Fields can I set on this object?”

The object_type in the URL can be one of: lead, contact, opportunity, activity/<cat_id>, custom_object/<cotype_id>.