It's the client that will fulfill the payment, we request some details like CPF, Name, or Email, that will improve their experience while paying, skipping some steps to complete further details. Even though it's not required, we encourage it to provide the best UX.
Completing the CPF and/or the CNPJ will make them skip completing those values themselves to authorize the PIX payment.
Providing an email will identify the customer's payments uniquely, making them available from Pluggy directly.