I am working on getting validation from our Infosec team on JIRA integration with Bitbucket. I will need to understand the type of authentication that is used between the two systems and the above mentioned diagram for them to understand how data flows between the two applications and any additional collateral you could provide.
Great question and we do have reference material to assist with answering this for you and your team. The short answer is we recommend OAuth for application links/integrations.
Here is reference material around application links: Use AppLinks to link to Atlassian products
Specific reference for Dev tools linking: Integrate with development tools
A detailed view into how OAuth works can be found at OAuth 2.0 (3LO) apps, this page will include the diagrams you're looking for as to how OAuth functions.
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