Looking for some advice around custom content lockers.

I am looking to revive an old project of mine which is essentially a competition website, only this time instead of asking people to pay to enter I want to use a content locker of some kind to have them complete an offer to enter.

I would like to award points to users based on the pay-out of an offer but after looking at the standard lockers on OgAdz I wasn't sure if this is something I will be able to do using their service. I vaguely recall this being possible in the past but maybe it was discontinued. I suspect I may be able to use their API to do something custom but thought I would check with you guys first... does anyone know if this is possible with OgAdz either with a standard locker or with the API.

Alternatively, do you know any other services which offer something similar?

might have answered my own question looks like CPALead offer the kind of thing that I need.

Yeah use the api and create a callback to your server to register points on offer completion