post https://sandbox.asaas.com/api/v3/fiscalInfo/nationalPortal
Here you can enable or disable the use of the national portal as an invoice issuer.
Attention
When changing your invoice issuing portal, some of your Tax Information settings will
be removed to be filled in again according to your new issuing portal. The Login and
Password or Digital Certificate in Access Data and the Service Code in Services will
also be removed to be needed again. Find out more information.