On the coupon is a 16 digit PIN, which you then input when depositing. Therefore, you need to find out about the site that you are about to sign up, get information about its security system, and also read for the customer testimonies.
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http://oldsite.giessen46ers.de/fantalk/vie...=5&t=223139
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https://talkingpoints.org/subx/showthread.php?tid=1492
http://aficionado.pl/showthread.php?548940...me&p=595020
http://forum.bandingklub.cz/viewtopic.php?f=22&t=1607790
https://talkingpoints.org/subx/showthread.php?tid=48458
http://strada.bielsko.pl/1_lubelskie/forum...-i-norge#587688
https://www.ww2.site/forum/viewtopic.php?t=167632
https://www.ww2.site/forum/viewtopic.php?t=265099