List, show, encrypt and decrypt service credentials. More information: https://www.freedesktop.org/software/systemd/man/systemd-creds.html.
systemd-creds encrypt --name {{name}} {{path/to/input_file}} {{path/to/output}}
systemd-creds decrypt {{path/to/input_file}} {{path/to/output_file}}
stdin:echo -n {{text}} | systemd-creds encrypt --name {{name}} - {{path/to/output}}
$CREDENTIALS_DIRECTORY):echo -n {{text}} | systemd-creds encrypt --name {{name}} --pretty - - >> {{service}}
systemd-creds encrypt --not-after "{{timestamp}}" {{path/to/input_file}} {{path/to/output_file}}