post https://sandbox.asaas.com/api/v3/invoices
--
This call includes the attributes payment, installment, and customer. Although they are not marked as required, as it is not necessary to send all three every time, it is mandatory to send at least one of them to designate whether it will be an invoice linked to a charge (payment), or installment (installment), or a standalone invoice, only linked to a customer.
Similarly, the municipalServiceId and municipalServiceCode, while not listed as required, must have one or the other sent.