We've been notified of the upcoming maintenance by Deutsche Post for the International Shipping API:
> Next to technical updates and minor improvements, Packet Return will be made available as a standalone product via the API. For more information on our return services please contact your local sales representative or firstname.lastname@example.org
and we will connect you with the right person.
> Important: During the update the webservices /APIs will not be available.
> We will do our best to keep the downtime to a minimum and apologize for the inconvenience this may cause.
We've also been notified that the maintenance might take longer than the planned downtime of two hours.