Through this endpoint, partners can register a Payer number, as this process is necessary to initiate the registration of bankslips.To use this endpoint, it is required to have an active account with BMP-274. The account creation can be done through the /api/v2/Conta endpoint. After creating the account and the payer, it is necessary to link the payer to a portfolio using the /api/Cedente/AdicionarCarteira endpoint.