leads_recommended_by_contact_identifier

id 

(semi-optional)

String

The ID of the contact information

id_number

(semi-optional)

String

The ID number of the contact information

passport_number 

(semi-optional)

String

The passport number of the contact information

social_security_number 

(semi-optional)

String

The social security number of the contact information

vat_registration_number

(semi-optional)

String

The registration number of the contact information