the rest just came in to white knight for GOG and/or criticize me.
That was just a little sarcasm for your absurd reaction to a problem that happens everywhere, every now and then.
Others already helped you, so no harm was done.
Don't feel like a victim attacked by evil fanboys now -_-
I disagree, I have never faced a similar problem in e.g. HumbleBundle (using Paypal there) or Steam (ie. you were charged even though the purchase failed).
I couldn't care less about GOG forum bugs and such (search and add friends don't work blaa blaa blaa), but the purchasing process and payment should be 100% trustworthy, always. If this is the same GOG payment problem that I have faced a couple of times a long time ago, it is VERY BAD, because it expects you to be vigilant and notice that you were charged even though the purchase process wasn't finalized correctly.
In my case, it meant I had to log in to my online banking service, and check whether there had been a money reservation for my credit card. During some sales where I might have bought several games from GOG during the same day on difference occasions, it might be hard to identify which money reservation exactly is that unsuccessful purchase attempt, especially if I had bought several games with the same price (individually). Very messy.
Frankly, it may be I have sometime in the past paid twice for some of my GOG games, because back then I didn't realize I was possibly charged even though I didn't get the game on the first attempt. So I tried to purchase it again, which succeeded. Meaning, I was probably charged twice, including the failed attempt. At least back then the extra charge was not automatically reimbursed, I had to notify GOG support about it, in case I noticed it myself. This is why I always say that if your purchase process on GOG.com hangs or fails, don't try to buy the same game again, until you have made 100% sure you were not charged. If you were charged, notify GOG.com so that they add the game manually to your account.
Then again, I haven't faced this problem for a long time anymore, so I was hopeful it has been fixed. Apparently not, if some others are still reporting similar behavior.
I am unsure what exactly is causing this, and why it seems to happen only on GOG.com. It is as if charging is performed first, and there is a slight change that the purchase process fails even though the charging went through. From my (customer's) point of view, I'd naturally prefer the opposite: the charge would definitely not go through until the game is securely on my GOG account, and I have been sent the receipt to my email. But then I don't know if that would mean GOG might accidentally give free games to some, if the charging still fails even though you were already given the game. Not sure if it could be even exploited in order to get games from GOG without paying, with good timing and such.