GG2U reward questions

Hey guys! I'm new to the beermoney thread and reddit in general lol. I've been following this thread for a couple days now as I want to make some money to spend on hobbies. I signed up on GG2U and it's been pretty good so far. I was just wondering if the offers where you pay money and get paid in return are worth it and how quickly can I expect to get paid for screenshotted offers? I did a special offer where you pay $20 for a mycleanpc subscription and get paid 3000 coins for a net $10 gain after sending a screenshot to the support email. How quickly do these get verified? Also, how to the game offers work? I'm doing this Harvest land offer for 700 coins on iOS but once I get to the specified level, how does offertoro or GG2U know that I got there? Thanks!