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I have been working since 2008, almoust 2 years.
Have you worked with these guys for 2 years ? If so then i guess they would have some knowledge of your traffic and would then be in a position to make a CPA offer .
If the offer just came out of the blue then i would be very suspicious of it. No legitimate company would offer CPAs or worthwhile CPAs in my opinion to somone off the bat.
I also did not mean to imply that you did not know what you were doing - apologies if it came across like that I just meant to highlight the fact that there seem to be some shrewd operators out there who are taking advantage of the fact that people will send traffic to a CPA offer and then they can simply refuse to pay based on data that they control.
I would stick to long standing programs at the GPWA and not be very tempted to offers out of the blue from people i dont know.