The id of the version to search for the product key. You can get the version ID by examining the URL in your browser. For instance, from the URL http://wyday.com/limelm/version/100/ you can see the version ID is 100. (Note: The Version ID is not the Version GUID).
If you've passed in a product key for the "email" paramater, then this version_id parameter will be ignored and LimeLM will search your entire account for the product key.
The email associated with the product key or the product key itself.
If the "email" parameter has an "@" character in it then LimeLM will search for product keys matching the email provided. If the "email" parameter does not contain an "@" character then LimeLM will assume it's a product key and return the matching product key details.
The method returns a list of product keys if there's a match with the email.