Currently Association Rules model does not have a scoring function as do other models like Classification, Clustering etc.
However, you can make use of the get model details api to obtain rules associated with a set of items.
See AR api for more information:
I have a few blog posts on generating Association Rules using ODM. A couple of these might be of use on extracting and using the rules. The first post (link below) show how to extract the rules using the workflow.
second blog post, towards the end shows how to do this in SQL
You can use ARs to find rules and patterns in the data. You can then use these rules how you want in your applications, as they are just IF/THEN rules.