Hello Rajesh,

Write a rest service class in one Salesforce org. Make a Call from different Salesforce org using Http/HttpRequest class.

For more detail: https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_rest_code_sample_basic.htm.

There are many middlewares tools which supports Salesforce <–> JIRA integration are available in market place . Also both are providing their own API’s and it is easy to connect any external source from Salesforce using apex.

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