curl --request GET \
  --url https://api.example.com/api/v2/_schema/{record_type} \
  --header 'Authorization: Bearer <token>'

{
  "api_name": "<string>",
  "display_name": "<string>",
  "is_custom": true,
  "is_junction": true,
  "supports_custom_fields": true,
  "attributes": [
    {
      "api_name": "<string>",
      "display_name": "<string>",
      "is_creatable": true,
      "is_updatable": true,
      "type_info": {
        "is_array": true,
        "value_type": "string"
      },
      "description": "<string>",
      "is_required_on_create": false,
      "is_unique": false,
      "is_custom": false,
      "is_sortable": false,
      "is_filterable": false,
      "filter_operators": [
        "<string>"
      ]
    }
  ],
  "relationships": [
    {
      "api_name": "<string>",
      "display_name": "<string>",
      "related_object_api_name": "<string>",
      "is_creatable": true,
      "is_updatable": true,
      "description": "<string>",
      "related_object_relationship_api_name": "<string>",
      "junction_object_api_name": "<string>",
      "is_custom": false,
      "is_array": true
    }
  ],
  "description": "<string>"
}