I'm using @ldoguin's REST Client example to fetch some data from openlibrary.org upon document creation.

User goes to create a new book:

At this time, once the user clicks Create, I would like to fetch rest of the information about the book from openlibrary.org with the given ISBN.

However, there's no document being passed into my OperationMethod, resulting into Document does not exist error.

Here's my event handler:

Lastly, here's my automation:

Thanks for the help!