Basic format

{
  "text":"${eventType} ${issueLink} in ${projectLink} by ${userLink}"
}

New format

{
  "text":"<eventType> <issueLink> in <projectLink> by <userLink>"
}

Advance format

{
  "text":"${eventType} ${issueLink} in ${projectLink} by ${userLink}",
  "attachments": [
    {
      "color": "#205081",
      "text": "${eventMessageBody}",
      "fields": [
        {
          "title": "Type",
          "value": "${issueType}",
          "short": true
        },
        {
          "title": "Assignee",
          "value": "${issueAssignee}",
          "short": true
        },
        {
          "title": "Creator",
          "value": "${issueCreator}",
          "short": true
        }
      ]
    }
  ]
}

New format

{
  "text":"<eventType> <issueLink> in <projectLink> by <userLink>",
  "attachments": [
    {
      "color": "#205081",
      "text": "<eventMessageBody>",
      "fields": [
        {
          "title": "Type",
          "value": "<issueType>",
          "short": true
        },
        {
          "title": "Assignee",
          "value": "<issueAssignee>",
          "short": true
        },
        {
          "title": "Creator",
          "value": "<issueCreator>",
          "short": true
        }
      ]
    }
  ]
}

Metadata

Key	Description	Example data
${eventType} <eventType>		E.g : "New issue created"
${issueLink} <issueLink>	It uses issue summary for displaying
${issueKeyLink} <issueKeyLink>	It uses issue key for displaying
${issueKey} <issueKey> <issue.key>	This is issue key	e.g : TEST-1
${issueSummary} <issueSummary> <issue.fields.summary>	This is issue summary	e.g : Cannot find attachment
<issue.fields.project.key> <issue.fields.project.name>	Project meta data	JS Support
${projectLink} <projectLink>	This is project link
<user.key> <user.emailAddress> <user.displayName>	Action user meta data
${userLink} <userLink>	It is action user on issue
${eventMessageBody} <eventMessageBody>	issue description or comment
${issueAttachments} <issueAttachments>	number of attachments in issue
${issueAssignee} <issueAssignee> <issue.fields.assignee.displayName>	current assignee
${issueCreator} <issueCreator> <issue.fields.creator.displayName>	issue creator
${issueResolution} <issueResolution>	Fixed, Won't Fix ... . You can define resolution data in JIRA
${issueResolutionDate} <issueResolutionDate>
${issueDueDate} <issueDueDate>
${issueStatus} <issueStatus>	"Done,Open"
${issueLabels} <issueLabels>	"Bug,Improvement,Feedbacks"
${issueType} <issueType>	e.g : Task, Story, Epic, Subtask
<comment.body> <comment.created> <comment.updated> <comment.author.displayName> <comment.updateAuthor.displayName>	Comment metadata
<issueComponents>	e.g : Development,Front End

Screenshot