Udimi is a safe place where you can buy or sell advertising. Here you will easily find other online marketers in your niche with thousands of subscribers.
Only sellers can become an Ad Text Writer, you can learn more details here: https://udimi.com/forum/changelog/5184-added-extras-section
Also, here is a detailed tutorial with a video about buying traffic on Udimi: https://udimi.com/help/buyer/how-to-buy
Hope this helps.
Try to use this filter "Main traffic source". It shows where the majority of clicks come from.
Determined by fresh actual stats gathered by Udimi clicks filter during 30 latest delivered orders. So try to contact the sellers that are displayed in this filter for the UK, Canada, NZ, AUS and other places.
A debit passcode is similar to PIN (Personal Identification Number) that you need to enter on a keypad.