How to link external application to jira for requesting the api

[Kartik Gour]

I need to provide the OAuth 2.0 instead of Basic Authentication so I need to register my application with jira can you tell how to do that 

Reference link:-

https://confluence.atlassian.com/adminjiraserver/link-to-other-applications-938846918.html

[Brant Schroeder]

@Kartik Gour At the bottom of the page that you provided above it has instructions on how to set up OAuth 2.0 on both Jira and Confluence.  There is a link there that has instructions on outgoing Oauth 2.0 connections https://confluence.atlassian.com/adminjiraserver/configure-an-outgoing-link-1115659066.html