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Pre-monthly/monthly claim or some promotion claim always by email.
For the case weekly claim, you will get email if under rank platinum and platinum rank have their own channel invite to claim a link weekly. Always check your email, or you just wait until someone share a topic about this in the thread.
Most people always talk about pre-monthly/monthly everytime they already out.
That is how I know it worked as well but I got confused about it for a while when people assumed they could get it somewhere else. It is only from the email you get and if you miss the email or mistakenly delete it or something then it is fully gone and you can't get it. That sounds a bit harsh considering it should be something you could get from the website and one mistake of email deleting shouldn't result with a loss but the amount is not a huge one so I doubt people really care about it.
I mean obviously we would want it, but if you delete or lose it then it wouldn't be life changing amount, plus we would just gamble with it anyway.