Tracking URL Preview Mode
You can check any tracking URL (ad impression, click, conversion, CAD) calling it in preview mode. A preview tracking request will be processed as closely as possible to the regular one. No request processing results are stored or counted. Processing results will be sent back as a JSON object containing all input parameters and calculated values like redirecting location URL and error information.
You can call any tracking URL in preview mode just adding at the end: &preview_mode=1