STEP-1
Go to Jira Settings > Apps > Configure SCM Activity > Bitbucket Tab.
Copy Web-hook Payload URL.
STEP-2
On Bit-bucket project, go to repository settings > Webhooks > Click Add Webhook
Define Payload URL: https://scmactivity.ilaesolution.com/scmactivity/bitbucket/push?clientKey=fd4a2eba-7864-3304-8292-****
Content Type: application/json
Choose Just the push event
Check Active checkbox
Click Update/Add webhook.
STEP-3
Perform Commit Git commit in comments with Issue key. e.g.
git commit -am"Bug fix. ref SU-25"
Go to issue, scm changesets tab and verify on, https://<HOST>.atlassian.net/browse/SU-25
Verify payload delivery.