To install the Pricefx Studio plugin:

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When a new version of the plugin is released, IDEA will check during startup and offer you to update the plugin version.

Troubleshooting

If you connect to a custom Pricefx server, you might get an error message "Unable to find valid certification path to requested target":

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In that case you need to import the server certificate to the certification store of JDK/JRE.

Export the SSL certificate of the Pricefx server that you are accessing in your browser, e.g. via Firefox:

1. Click the lock icon next to "https://...." and click "More details" to display the page security dialog.
2. On the last tab "Security" choose "View certificate". 
3. On tab Details choose "Export". Select the "X.509 (DER)" format and save the file pfx.der into your home directory.

Then in JDK of IntelliJ IDEA run this (search the cacerts file and adjust the path jre/lib/security/cacerts accordingly):

Mac:

cd "/Applications/IntelliJ IDEA CE.app/Contents/jdk/Contents/Home/"
sudo keytool -import -alias pfx -keystore jre/lib/security/cacerts -file ~/pfx.der

Win (use importcert instead of import. Also adjust your installation path of IDEA):

cd "c:\Program Files (x86)\JetBrains\IntelliJ IDEA Community Edition 2017.1.4"
bin\keytool -importcert -alias pfx -keystore jre\lib\security\cacerts -file pfx.der

Then enter "changeit" (without the double quotes) as the password to the JRE cert store.