Systems and methods herein allow for automatic monitoring of conversions associated with uniform resource identifiers (URIs) accessed via client applications but actuated on web browsers. Upon actuation of a URI on a browser of a client device, a data processing system can assign a click ID to the actuation event and send it to the client device. The client device can open the URI in a client application and send the click ID and a client ID associated with the client device to the client device. The data processing system can map the click ID to the client ID. Upon occurrence of a URI related conversion, on the client application, the data processing system can receive a conversion message indicative of the conversion and including the client ID, and link the URI related conversion to the click ID based on the stored mapping.