This question is in reference to Atlassian Documentation: Manage users and groups
How do I set up a user so they can only review Billing information?
What billing information? Something you've built in JIRA, Tempo (or other billing addon) stuff? Or do you mean your Atlassian account that is used to pay for your Cloud install?
The latter
Ok, that interface is quite simple - a person is either a billing contact or they are not. There's no layered permissions there.
Ok, so how do I set a user up to be a billing contact only?
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