Mobile app store attribution (remove Adjust links)

[alexgibson]

Description

We currently use Adjust to attribute downloads to installs for our mobile apps such as Firefox, Focus, Pocket and VPN.

Being a third party tracker, we'd like to remove Adjust links and replace them with native app store links with appropriate campaign specific parameters.

Some of our existing issues around Adjust for context:

• https://bugzilla.mozilla.org/show_bug.cgi?id=1448153
• Remove adjust.com links #8309

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Success Criteria

• Adjust URLs are replaced in bedrock with native app store links (plus page specific campaign params)

[alexgibson]

For Android, it looks like you can pass a referrer parameter to the play store, which can then be read by the native app.

https://stackoverflow.com/questions/43895757/how-to-get-google-play-referer-in-an-android-application

Doing a curl on an existing adjust URL shows this is what they are using also:

agibson@agibson-42230 bedrock % curl --url 'https://app.adjust.com/jcn6eyw?campaign=firefox100&adgroup=android-store'
<a href="https://play.google.com/store/apps/details?id=org.mozilla.firefox&amp;referrer=adjust_reftag%3DcysMF5HnK6One%26utm_source%3Dpaidsearch%26utm_campaign%3Dfirefox100%26utm_content%3Dandroid-store">Found</a>.

The same doesn't happen for iOS, so there must be some other mechanism at play here:

curl --url 'https://app.adjust.com/2uo1qc?redirect=https%3A%2F%2Fitunes.apple.com%2Fus%2Fapp%2Ffirefox-private-safe-browser%2Fid989804926&campaign=www.mozilla.org&adgroup=firefox_browsers'
<a href="https://itunes.apple.com/us/app/firefox-private-safe-browser/id989804926">Found</a>.

[alexgibson]

There's now also a campaign query param for Apple Store links: https://developer.apple.com/help/app-store-connect/view-app-analytics/manage-campaigns

This, combined with the Play Store Referral API for Android seems like a good solution for removing Adjust altogether?

[alexgibson]

Spreadsheet of proposed replacement URLs for both iOS and Android Adjust links: https://docs.google.com/spreadsheets/d/1vu10yfZzI60QXFRE9JGLBaho4x3dhN1gu0pd4rp3ggo/edit?usp=sharing (Mozilla access only)