In the sales process, order processing is a very important step such

[jowilkinso-96]

How to check new orders and confirm secure payment.

How to properly package products to avoid damage during shipping.

Experience in choosing a reputable shipping service, printing shipping labels and updating tracking codes.

Tips for handling situations such as customers changing their minds, late delivery or refunds.

[papso22]

You are in Brazil.  Any advice you get here will relate to UK business accounts.

I suggest you ask again on the ebay site for your country of registration,  probably ebay.com.