To see the current operational status of Heydoc, see here.
On that page, you can see the past 90 days of the following status information:
Heydoc: This covers all the services offered by Heydoc to clinics, such as Appointments, Invoices, and Settings
Public API: The servers for the Heydoc API
Patient Applications: This covers all the services offered by Heydoc to patients, such as Online Booking and Questionnaires
You can scroll down to Past Incidents to see any issues from today or the past 30 days that may have affected your Heydoc clinic.