How do I integrate Google Books API with CustomPress


I am running a multisite environment with marketpress and tt marketpress frontend, trying to create an etsy/ebay type store that sells physical books. I realise that to add the functionality I need I will need to use CustomPress to add book genre etc but ideally what I want to do is to have some way of the user entering the ISBN in the front end which then populates the post automatically with thumbnail, title and details of the book. Calling that data from either the amazon api or google books api. I've seen that the call to the api is done like this{collectionName}/resourceID?parameters but I am unsure on how to integrate that with custompress and marketpress. Any help would be appreciated.