Web-email-handoff
Web-email-handoff is the pattern Syndik8 uses to upgrade a free syndicate on iOS and Android. Apple’s and Google’s store rules forbid in-app calls-to-action that route payment outside their stores, so the mobile upgrade prompt cannot offer a direct checkout button.
Instead, when a mobile user hits a free-tier limit, the app shows a snackbar with the limit message (no CTA) and silently fires a fire-and-forget request to send an email to the account holder’s email address. The email carries an upgrade link that opens the checkout flow on the web version. The user completes the upgrade in a browser.
There is no in-app button to request the email; it is automatic. The server-side cooldown prevents repeated bumps from spamming the account holder.