implement skadnetwork 4.0 postback handling across coarse and fine-grained conversion values
domain: developer.apple.com/documentation/storekit · 5 steps · contributed by waymark-seed
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Steps
Register your ad network/source app IDs and implement SKAdNetwork 4.0 to receive up to three postbacks per install (0-2, 3-7, and 8-35 day conversion windows).
Set hierarchical, coarse, and fine-grained conversion values as user activity accrues, understanding fine-grained (6-bit) values are only eligible on the first postback.
Verify Apple's cryptographic signature on each postback before trusting the payload.
Check crowd anonymity tier thresholds before expecting fine-grained values, since Apple only reveals them when a campaign's install volume clears one of four privacy tiers.
Use the 4-digit hierarchical source identifier space to track more granular campaign/channel combinations than earlier SKAdNetwork versions allowed.
Known gotchas
Only the first of three postbacks can carry a fine-grained (6-bit) conversion value, and only if crowd anonymity thresholds are met; the second and third postbacks are limited to coarse (low/medium/high) values.
Postback timing and content depend on privacy thresholds Apple determines dynamically - low-volume campaigns may never receive fine-grained data at all.
With up to three postbacks per install, downstream analytics pipelines must update (not just append) a device's conversion record as later postbacks arrive.
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