This scam has been posted twice before. The script you have to use is a SCAM to steal your bitcoin. And the 1 post newbie vouch (and likely many others to follow) is obviously a fake as well. You have been warned.
Here is the explanation from Legendary member BITSPILL: https://bitcointalksearch.org/topic/free-gift-cards-bitrefill-method-feb-2020-workinggiveaway-5223809
Topic: Get $100 Amazon Giftcards for FREE with BTC ✔️ [Repeatable] (Read 155 times)
legendary
Activity: 1919
Merit: 1230
AKA Ms-overzealous-condecsending-explitive-account
thanks dude!! actually I didn't take giftcards but I got 200$ worth of games 
If u download that file you will get all sort of viruses
You have been warned
You have been warned
It's a PDF lmfao
If u download that file you will get all sort of viruses
You have been warned
You have been warned
Hey y'all Btctalk members, I got this method from some forums.
Tried it today and it worked, so I’m sharing it here. With this method, you can get giftcards for Amazon, Steam, Battle.net, PSN, iTunes and more…
You can either redeem these giftcards, or sell them on sites to earn some easy money (of course in crypto).
Guide :
Downloadable PDF :
https://anonfile.com/x4x657k3o4/G2A_Glitch_pdf
DocDroid shared PDF :
https://docdro.id/MUJaJbz
Tried it today and it worked, so I’m sharing it here. With this method, you can get giftcards for Amazon, Steam, Battle.net, PSN, iTunes and more…
You can either redeem these giftcards, or sell them on sites to earn some easy money (of course in crypto).
Guide :
Downloadable PDF :
https://anonfile.com/x4x657k3o4/G2A_Glitch_pdf
DocDroid shared PDF :
https://docdro.id/MUJaJbz
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