Analogous to the messages from us to your system, you can also transmit messages/requests by XML.
You receive a response on success or failure through the tracking interface. The assignment can be made using the 'request_reference_id' attribute with your unique request ID.
<unique_id_for_request_package>_<YYYYMMDDHHIISS>.xml
YYYY: Year, 4 digits
MM: Month, 2 digits
DD: Day, 2 digits
HH: Hour, 2 digits
Minute, 2 digits
SS: Second, 2 digits
URL: command-request.pdi.elanders-germany.com
Port: 22
Protocols: sFTP, SCP
Authorized Keys: RFC 4716