calling external APIs from JIRA workflow transition

[Ashwin Pandagre]

Hi All,

 I am new to jira. I am exploring a way:

1: To call an external API with inputs from the task in the workflow.

2: Trigger the API when a task moves from one state to other. Update the output of the API call to a field in the task.

3: Write a logic that if the value exisis already in the task, do not call the API.

How can i achieve this??