For those requiring a credit card for trials, how are you tracking metrics/conversions? Since the conversion happens when the trial ends, which is an event disconnected from your customer's browsers session, none of the JavaScript/cookie-based 3rd party software will be able to be capture that event. Some do have a backend API you can call if you can identify the user (e.g., KissMetrics & MixPanel both have this), but others do not (e.g., AdWords and Optimizely).