The Caixa Empresas connector asks for your USERNAME ("Usuário") and PASSWORD ("Senha") — the same credentials used in Caixa's Internet Banking and mobile app.
Username ("Usuário"): alphanumeric
Password ("Senha"): alphanumeric
Caixa PJ Tutorial
Which credentials to use when connecting a Caixa Empresas business account: the same username and password used in Internet Banking.