Hi Just to let you know, I searched the forum and googled but still confused. I have android apps and want to monitize them so I signed up in few network like MGCash and CPAWay and others. I can see each have many offers for and each offer is limited for a single country! 1- What's the best way to pick these offers? one by one for each country? BTW my top users are from US, UK and Mexico. I think content locker shows random offers but I don't want to use PIN Submit. 2- What's postback? Is it to track if this specific user submited the offer or not? I think it's related with proposer202 which I think tracking platform for CPA. 3- Let say I picked 1 offer for each country, how can I track my users if they completed the offer or not? BTW, I'm web & mobile developer. My best regards.