Hi @Yarik,
Thanks @DanielCHood and @hector_borras for chiming in here! The “url_clicks” is linked to an old beta product, therefore it should always return null. We have already added to our list to either update or remove as the parameter returns no useful data.
As an example, the clicks param reported back on website card for clicks or conversions campaign would report # of clicks on the card. Where as engagements would include media engagements, retweets, replies, follows, etc plus clicks.
Thanks again!