Any one have any thoughts on the subject?
First thoughts are perhaps Amazon via the Iap object.
Pros:
Its Amazon, they'll sell anything.
One click purchase. lol
Cons:
Might only be for Android perhaps?
On the other hand Node-Webkit is a much better platform for downloadable content....hmmm
The thing is on android, you'll manly be using google play services I think, but with the node webkit export, there is not a main store keeping everything at bay, it could be steam for someone, amazon for another, even you own website, I think the iAP plugin only works on platform specifics, and even then it is a pretty weird thing to have an all in one plugin, hard to maintain, but that is an interesting question.