How to create a custom button for a JIRA issue ?

[erfan pj]

Dears,

I need to have a button on all issues, which whenever the user clicked on this button it should call external API and then update my issue(Summary, description, priority...) from the response.

I'm really appreciated if someone let me know what is the best approach to discover these concerns.

[Tuncay Senturk _Snapbytes_]

Unless you're not implementing your own plugin, you can only do that by adding global transition to the workflows.

If you use Easy Integrations for Jira free app, you can add Rest Caller post function to call Rest method, and update jira customfields with response.