Hi,
My first response would be: use a standard solution - bugs in this type of software can have severe consequences. If you have an Azure AD that your inhouse application sync's to/with, I would use Atlassian Access to connect the cloud instance (or rather organisation) to that Azure AD.
If you really really want to build something yourself, you should take a look here: The Jira Cloud platform REST API (atlassian.com)
//Sune
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