If you have already installed the addon, then you just have to wait until the free trial period ends, and after that, you will be charged the addon's fee to the account you have set as your payment method on your instance.
Once the trial period had ended, you will be able to see the estimate of your next bill here:
Thanks for signing up for Jira Ops! I’m Matt Ryall, leader for the Jira Ops product team at Atlassian. Since this is a brand new product, we’ll be delivering improvements quickly and sharing updates...
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