As Atlassian Experts, we are also authorized resellers of Atlassian Licenses, which includes all the plugins on the Atlassian Marketplace. Every now and then, someone will ask us how to update a plugin license, which is not super obvious. Here is how to do it, and this will work for pretty much any Atlassian application, because they all use the Atlassian Universal Plugin Manager.
First, you'll need to go in the Manage Add-ons page of the Administration section of the application. If you're on JIRA, you can use the "g g" keyboard shortcut and just type Manage add-ons. (The period key also works as a shortcut)
Accessing "Manage add-ons" in JIRA
On Confluence, you'll need to access the Add-ons page from the Administration menu, top right corner, by clicking on the gear icon.
Accessing "Manage add-ons" in Confluence
Once you're on the Manage Add-ons page:
Here's an example on how to update the JIRA Agile License in JIRA:
Click on the image to enlarge it
Do not hesitate to contact us about purchasing licenses for Atlassian products and plugins. For renewals, we can synchronize the end date of the support period for all your licenses. We accept Purchase Orders and can invoice you in the currency of your choice.