Limitations
The method is available for all account users.

Data type header when the request is successful
Content-Type: application/hal+json

Data type header in case of an error
Content-Type: application/problem+json

Response parameters
The method returns an array of custom field objects. The properties of the custom field object are listed below. Object properties differ depending on the entity.

Parameter	Data type	Description
id	int	Field ID
name	string	Field name
code	string	Field code that can be used to update the value of the field without passing the field ID in the request.
sort	int	Field sorting
type	int	Field type
entity_type	string	Entity type (leads, contacts, companies, catalogs)
is_predefined	bool	Defines whether the field is predefined. This parameter is returned only when getting a contact or company fields list.
is_deletable	bool	Defines whether the field is deletable. This parameter is returned only when getting a contact or company fields list.
remind	string\|null	Birthday reminders setting (never, day – day before the event, week – week before the event, month – month before the event). This value is available only for the birthday type field. This parameter is returned only when getting a list of lead, contact, or company fields.
enums	array\|null	Available field values array. Only available for the fields with enum values.
enums[0]	object	Available field value model
enums[id]	int	Value ID
enums[value]	string	Value
enums[sort]	int	Value sorting
is_api_only	bool	Defines whether the field is editable via API only. This parameter is returned only when getting a lead, contact, or company fields list.
group_id	string\|null	Fields group ID for the current field. This parameter is returned only when getting a lead, contact, company, or customer fields list.
required_statuses	array\|null	Array of the fields required to change a lead status. This parameter is returned only when getting a lead, contact, or company fields list.
required_statuses[0]	object	Required field model. This parameter is returned only when getting a lead, contact, or company fields list.
required_statuses[status_id]	int	ID of the stage which requires the current field to have a value before the lead can be moved. This parameter is returned only when getting a lead, contact, or company fields list.
required_statuses[pipeline_id]	int	ID of the pipeline which requires the current field to have a value before the lead can be moved. This parameter is returned only when getting a lead, contact, or company fields list