Added /ipn handler
Added /ipn handler
Merge branch 'europa' into development
Revert "Merge branch 'europa' into development"

This reverts commit b7b38b551e86b1f937b9c533f5b2e6ecc0715884, reversing
changes made to e5793c858921ebd441b4c5a613ac01fab9c1e3f8.
New /sign endpoint: enables a signed-copy download of the publication.