JIRA OAuth 2.0(3LO) in cloud

Hello Team

I am working on a project which need JIRA Auth for different user using a same app of jira. We have to use only OAuth 2.0(3LO) method only. The bot is in cloud platform. How do i make login process for different users??

https://developer.atlassian.com/cloud/jira/service-desk/oauth-2-authorization-code-grants-3lo-for-apps/