Like SKAdNetwork, PCM only provides one 'attribution report' per click, which is randomly delayed between 24-48 hours, and can be delayed further by firing an addition 'trigger event' with higher priority. This means no additional postbacks if the user performs subsequent activities further down the funnel.
Unlike SKAdNetwork, PCM is not designed exclusively for ads, and can be activated multiple times per user (basically, a single 'attribution report' per click the user performs).
For more details on PCM, read the WebKit announcement blog post.
Updated 5 months ago
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