Hook integration v. 214 is now available via in-app updates.
FIXED: Reintroduced support for pre Big Sur users (macOS 10.15 Catalina), since x-callback-url is not available to them.
How to get the updated integration
Hook’s automatic software update (if enabled) automatically updates Hook’s integration scripts without you needing to relaunch Hook. Using Hook’s Check for App Updates and Update Scripts command also updates the scripts, without you needing to relaunch Hook.
This requires a valid Updates license.