Can anyone indicate studies or reports on the payment processing sector?

Can anyone point me to studies or reports that breakdown the Brazilian payment processing sector?

I'm looking to understand the payment processing industry. My goal is to grasp the various steps involved in payment processing and key players in each step of the process.

If you have any recommended sources, such as books, websites, reports, or industry associations, where I can find reliable and up-to-date information about the payment processing industry, please share them with me.