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Esse endpoint possui o recurso "with".
Com ele é possível trazer objetos relacionados ao registro que está sendo buscado./companies?with=persons
/companies?with=city
/companies?with=deals
/companies?with=deals_involved
/companies?with=cnaes
/companies?with=tags
/companies?with=notes
/companies?with=notes_through_deals
/companies?with=activities
/companies?with=emails
/companies?with=contactEmails
/companies?with=contactPhones
/companies?with=customFields