Since January 2024, it has been mandatory for DiGA manufacturers to enable their users to authenticate via the GesundheitsID (Health ID). What sounds like a manageable "just another login method" turns out to be one of the more complex integration projects on the way to the DiGA directory – because behind it is not just an OAuth flow, but the entire sectoral identity federation of the telematics infrastructure (TI 2.0).

This article explains what the GesundheitsID is, why it is mandatory, how the integration works technically, where the real hurdles lie, and how you provide the proof required by the BfArM.