A sample properties file for PostgreSQL would be:

host=<A cloud url or host accessible from the application>
port=<Port to connect to the DB>
password=<password><Default catalog to connect to. Note, skipping this value can result in errors><Specify the schema name>
defaultdb=<The default database to connect to. Typically same as>
ssl=<Optional. Valid values, true|false>
sslrootcert=<Required if ssl=true. A cloud location of the root ca certificate. Example for AWS RDS postgresql this value would be, s3://rds-downloads/rds-ca-2015-root.pem>