Issue Summary

When creating an automation rule to send a Webhook with a custom payload with the variable ${event.user.name}, the variable is not interpolated with any value and is sent empty.

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This bug was reported in Community Questions, at the following question: https://community.atlassian.com/t5/Jira-Service-Desk-questions/Automation-webhook-custom-payload-variables-missing/qaq-p/1408516

Steps to Reproduce

1. Create a custom automation rule, with:
   1. WHEN: "Issue resolution changed";
   2. THEN: "Webhook";
   3. Configure the webhook with a test URL;
   4. Select "Send custom payload" as body type;
   5. Add the following to the payload textarea:
      { "user" : "${event.user.name}" }
   6. Confirm;
2. Before saving the new rule, click in the "Options" link in the upper-right corner, and select "Run as the user who triggered the rule";
3. Save the new rule;
4. Add the webhook test URL to the Whitelist (http://PATH_TO_JIRA/plugins/servlet/whitelist);
5. Trigger the automation rule by resolving an issue.

Expected Results

The webhook should be called with a value like:

{
  "user": "my_user_name"
}

Actual Results

The webhook is called without a value for the user:

{
  "user": ""
}

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available