Can't get Pay with a like to work on a single post...

I just bought Pay With a Like. Thought I could use it for a marketing campaign.
I want to have a blogpost which content you can see when you like our Facebook page. I sort of figured it out but when I add
[pwal id="50967635" description="Test like"]Hidden content[/pwal]
to the post and enables it and set the method to "Use the selection tool" nothing is visible. I've looked at the generall settings but can't seem to make it work :slight_frown:
Any ideas?
One more thing, where do you send the receipt?