Centos7 systemd run jar e salvar pid

Question

[Unit]
Description=api service
After=network.target

[Service]
User=api 
Group=api
SyslogIdentifier=api
ExecStart=/usr/jdk/bin/java -jar /usr/api/api.jar
Type=simple
WorkingDirectory=/usr/api

[Install]
WantedBy=multi-user.target

Eu quero salvar o pid em /usr/api/run.pid.