Data Reliability of facebook Conversion API through gateway implementation

Question

facebook's pixel and conversion API are both used to track specific events. While the pixel events are sent through the javascript code on the user's browser, the conversion API events are sent by the code getting executed on the server when that page is requested. With the IOS 14 updates and ad blockers, the data from Conversion API is considered to be more reliable than the pixel data.

While the best way to install Conversion API is through manual coding. however facebook also offers a click and create gateway system to install conversions API wherein we establish a server in the cloud which gets the data from the pixel in the user's browser and the cloud server then sends in the Conversion API event to facebook's server. See attached image of the architecture from facebook's developer portal.

Since in this case, the pixel in the browser is the one that is sending the events to the browser - how can we say that the data from the Conversion API will be more reliable. If an IOS update or an ad blocker is restricting the pixel to call facebook pixel servers - it will also restrict the call to the conversion API server.

Answer 1

Sending data to Facebook is considered as third arty whereas sending data to our own server is considered first party.