Not knowing the specifics of each specific reward offer, I would just direct you to read closely any details provided about what is required from you to complete the offer. Generally, the third party in each offer gives a notification when someone has completed whatever requirements there are, at which point CPs are awarded and I imagine you are free to cancel. If there are more specific questions, you should email Veynom as he deals with these matters himself.
I dare you to make less sense.
Are you a newbie, or do you have access to newbies?