List schema fields v2 crm entity schema
Retrieves schema fields for a specific CRM object type within a Generic CRM integration. Returns field metadata including names, data types (STRING, NUMBER, PICKLIST, etc.), labels, reference relationships, and picklist values for ACCOUNT, CONTACT, DEAL, or LEAD objects. IMPORTANT: Only works with Generic CRM integrations created via /v2/crm/integrations API. Does NOT work with native integrations (Salesforce, HubSpot, Dynamics 365). Required: integrationId (from Generic CRM integration creation), objectType (ACCOUNT/CONTACT/DEAL/LEAD).