If you have received a disbursement from Assembly Payments with a batch id (2900 for example), you can use this ID to find the Item.
To do this run the following two GET queries against the batch_transaction end point:
- GET /batch_transactions?batch_id=2002
- GET /batch_transaction/:id/items (where :id is the disbursement ID from above)
Once you have the relevant Item ID, you can use then this to identify the User.