They claim that they support amazon.com.br, but they don't! Fake news.
The first message you get is: "Keepa can sadly no longer update product data for Amazon.com.br"

As promised while emailing Keepa customer service, here is your 1 star review. Your refund policy is antiquated and set up in such a way that makes it appear as if you're only in it for the money. Submitted a request for refund the day after funds were pulled from my account. Most organizations allow for a 10 to 14 day refund request window.

I never use this add on and forgot to log in to cancel the yearly subscription I was automatically enrolled in when signing up.

Seems legit shady.

In response: Horrible response. "Oh your not going to use our product for the upcoming year you paid for it (mistakenly), too bad, we're keeping your money." Enjoy your 1 star.

Non funziona più!

役にたってない