To implement an Offerwall, I have to integrate and SDK. How do I do this?
You can develope an extension for so, or suggest a component for that
At this time I suggest you for enhance.co
Or you can try if found way to open web view
There is also another website appwall - Leadbolt
I suggest you to have a look at these two tutorials
How to use enhance connector
Make a offerwall using Tapjoy and enhance