I can't pay for my game. There seems to be a problem with the final "PAY FOR YOUR ORDER NOW" tab. I sent 3 emails back to GOG but all I get in return is robo response. How can they stay in business like that? Someone is asleep at the switch. Anyone else have this problem?

Are you trying to buy DLC (including soundtracks) for a game you don't already own and isn't part of your order? That's the most common cause for the Pay Now button to be inactive.

Also if you have scripting disabled via Noscript or something, and say it uses Google services you might have to temporarily enable or just give full permission temporarily

No - reread the post.

Problem resolved and clearly my fault. I was trying to purchase a part of a game that require a prerequisite.