Since Google Analytics

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Going a step further, imagine a user has been retargeted with a Dynamic Product Ads campaign. This ad format shows them an ad for something they are already interested in and have previously added to their cart. The user doesn't click; instead, they go directly to their cart on the website and complete the transaction. Of course, it's logical that they do so, since they have no reason to click on the ad and are already familiar with the product. The ad alone reminded them that they had previously added a product to their cart but hadn't purchased it yet. Therefore, the Facebook ad should take credit for reminding them.

has seen on Facebook, it can't report conversions per view. Only engineer data clicks. For this reason, Facebook typically reports higher metrics. But it's not that conversions are inflated. It can be argued that seeing an ad in the Facebook news feed, regardless of whether it is clicked or not, has raised awareness of the brand and, therefore, Facebook had some influence on the purchase decision.

Of course, it's impossible to accurately analyze the ad's influence on the purchase decision.Attribution Window
Facebook reports an attribution window of 1 day for view and 28 days for clicks. Most third parties only track through a click window, which causes discrepancies because, as mentioned above, Facebook also counts clicks.