Oauth is used when configuring application links or DVCS connections to Bitbucket or Github. In those cases you create an OAuth access token on the DVCS system or the local (FishEye/Crucible, etc) server.
https://confluence.atlassian.com/display/BITBUCKET/Linking+Bitbucket+and+GitHub+accounts+to+JIRA
https://confluence.atlassian.com/display/APPLINKS/Configuring+Authentication+for+an+Application+Link
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