How can you check whether a Twitch donation is real?

Exactly as it is in the question, I wonder how exactly you can check that. I saw that you can fake that in chat, but what if it pops up in the stream? Can you still withdraw the transfer as someone who donates? I just don't want to give me hope when someone donates.

Depending on how you pay, you can get your donation back.

And always? So for example via PayPal? So if someone donates they can always get the money back?