"Tax Form" and "Payment Method Form" required at app submission


When trying to submit a new version of our app to DEV environment 2 unexpected documents have been requested: a “tax form” and a “payment method form”.

Notice that those documents were not submitted when we submitted the app last time (around 2 weeks ago).

What are those documents about? Are they necessary for any submission in DEV env? Are they mandatory for a pilot submission in PRD env?

Thanks in advance for your attention and help in this matter.

Kind regards,
Sergio Rodrigues de Morais