How to choose a specific payment method during checkout?

Hello! I am developing an integration with your application, and it is not clear to me how to select a specific payment method when receiving a checkout code. I tried excluding the other two methods, but that didn't work either. Therefore, I would like to understand what data needs to be sent. It will be great if you write code here to send data to php. I took the information from here: https://dev.pagseguro.uol.com.br/v1.0/reference/checkout-pagseguro-criacao-checkout-pagseguro