After importing all the certificates into your SHRINE keystore, you will need to configure two places to utilize the new keystore:
The first place, is in the keystore section within shrine.conf:
This is to make sure SHRINE uses the signed certificate to sign queries going out from your site.
The second place, is in the keystore section within /opt/shrine/tomcat/conf/server.xml:
This is to configure Tomcat to use the same signed certificate to serve your site's HTTPS traffic.
After making changes to these two files, please restart Tomcat services.