Little stickers on Suntory Premium Malt beer cans

Hi all,
I’m in love with Suntory Premium Malt beer after first trying it in Tokyo, and regularly buy it from a seller here in the UK that imports it from Japan.
I have a question about the little stickers on the can though.
What are they? Are they part of a points reward system? (Collect 100 and claim a free shirt or something lol). I’ve got an absolute ton of them on my fridge door but unfortunately can’t post the image.
Thanks in advance for the rather niche question!

https://www.reddit.com/r/japan/comments/13iffpr/little_stickers_on_suntory_premium_malt_beer_cans/

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