Unfortunately it isn't there, on both accounts.
I've lodged a support ticket, but this is a bad first time using GMG
Yeah I've had a few quirks so far too. My first purchase was the AvP game and that went smooth.
My second was trying to do the Joystick Awards voting thing which still hasn't worked out. I did a support ticket to them for that and it turns out that you have to use the same email address on the voting site as you have registered with your greenman account. I give every website a different email address using mail aliases so that apparently broke it for me. I went back and changed the voting site email to my greenman email and am now waiting to see if it has any effect. They don't tell you this anywhere though so I'm sure others who use mail aliases or separate accounts for each website will hit the same problem. I'll see how things go tomorrow.
I had another screwup tonight and no idea what happened. I went to buy Dear Esther with a similar deal like the AvP game and after verifying my credit card and redirecting me back to greenman's final page it was waiting for results and timed out. It did not complete the transaction and did not put my game in my library, but it appeared to have completed the credit card transaction. I called my credit card company and they did not have the transaction on file so it appears it did not go through. So I went back in to do it all again and it showed I had it in my shopping basket still, I clicked on it to re-checkout and it told me I couldn't until I completed the transaction. Huh? How? It would not let me purchase any other games either. I contacted support but once I sent my email the shopping cart timeout expired and removed the item automatically. I went and did it all again and the second time the transaction went through ok. No idea what went wrong, but I didn't change anything on my end so it had to be either their website or something interfering with the credit card transaction. It could very well be a one off fluke though so I'm not going to beat them too hard for it unless it happens again.
Since then I've bought 2 more games individually using the same process with a voucher discount and they went through immediately with no problems. All games were Steam games and my keys showed up and worked.
They did however tell me via support that the game giveaway had an enormous response far greater than what they expected and it had overwhelmed their servers but that they would sort everything out over the next few days. As long as their support people fix everything then I'll be happy. Anyone can screw up unintentionally, but as long as they fix it in the end then they're good in my book. I've had problems with GOG in the past not unlike this also and GOG support is awesome and not only fixed things up very quickly for me each time, but several times now they've gifted me game codes for my inconvenience which wasn't expected or necessary. The last time my order killed their checkout software for buying more than 50 games at once - it had a bug and lopped off the games above 50. They apologized and gifted me the missing games (I had not been charged for them).
So I guess glitches can happen anywhere really... so long as a company fixes things and keeps the customer happy is all I care about in the end. ;o) Let us know how your problem gets resolved too!