How can I make sure that the payment slip corresponds to the shop I bought it from?

The boleto must have been generated within the environment of the shop where you made the purchase.

The shop may also insert a message on the boleto such as: This boleto was issued to the order of ‘COMPANY NAME’.

If you have any doubts about the legitimacy of the boleto, please contact the support team of the site where you are making the purchase.