Apple has released updated guidelines for iTunes Connect describing how app developers should use IFA (IDFA). Click here, to peruse these guidelines.
When submitting your app you have to disclose your IDFA uses.
Check this box if you show ads in your app. AppsFlyer's SDK is not used to serve ads.
AppsFlyer uses IDFA only for: “conversion events, estimating the number of unique users, security and fraud detection”. The data is owned by our clients, the app developers, and AppsFlyer never uses IDFA for user profiling and retargeting.
Your media partners might have different uses for the IDFA. You must make sure that these partners fully comply with this section.