Custom Action to create a new email case. POST to /api/v2/customers/{{case.customer.id}}/cases.

gistfile1.txt

{
  "type": "email",
  "subject": "Follow up for case {{case.id}}",
  "priority": "{{case.priority}}",
  "status": "open",
  "labels": [
    "Demo Followup"
  ],
  "custom_fields": {
    "case_id": "{{case.id}}"
  },
  "_links": {
    "customer": {
      "href": "/api/v2/customers/{{case.customer.id}}",
      "class": "customer"
    },
    "assigned_user": {
      "href": "/api/v2/users/{{case.current_user.id}}",
      "class": "user"
    }
  },
  "message": {
    "direction": "out",
    "status": "pending",
    "from": "support@zzzricky.desk-mail.com",
    "to": "{{case.customer.email}}",
    "subject": "Follow up for case {{case.id}}",
    "body": "{{case.phones_and_notes.last.summary}}"
  }
}