Hello both, thanks for your message.
Assuming you would like to redirect your users to a specific URL whenever they click on an FDL link while FDL is still serving (i.e. the specialty page you mentioned about the service being shut down), one option could be the following:
1) Removing the link parameter from your FDL links (this is assuming you no longer want the deep-link to initiate the App Links or Universal Links flow even if your app is already installed).
2) Specify an afl and ifl parameter in your FDL links and set them to the URL(s) you want to use for the specialty page.
3) Update the ofl parameter to the URL for the specialty page.
At the moment there isn't a way to offer redirection for FDL links besides the above and the current shutdown date is still planned for August 25, 2025, however we'll take your feedback into consideration and post again here if there are any updates.
Thanks,
-Sumit