The nested fields under the debtor object are optional and identify the debtor, i.e., the person or institution to whom the charge is addressed. It does not necessarily identify the one who will actually make the payment. A CPF may be the debtor of a charge, but it may happen that another CPF makes the actual payment of the document. The fields debtor.cpf and debtor.cnpj cannot be filled at the same time. If the debtor.cnpj field is filled, then the debtor.cpf field cannot be filled, and vice versa. If the debtor.name field is filled, there must be either a debtor.cpf or a debtor.cnpj field filled.