Question on REST API endpoints

Hi team!

I was wondering where do we put the secret keys from the QLL layer for the software to ingest and call the end points from
 ~/qkd-net/kms/kms-service/src/main/java/com/uwaterloo/iqc/kms/controller/KMSController.java    such as ("/v1/keys/{slaveSAEID}/enc_keys") 
Thanks in advance!