Order a Service Template

Request:

POST /api/service_catalogs/:c_id/service_templates/:s_id
{
  "action": "order",
  "field1": "field 1 value",
  "field2": "field 2 value"
}

Response:

{
  "href": "/api/service_requests/:id",
  "approval_state": "pending_approval",
  "requester_name": "<requester name>",
  "request_state": "pending",
  ...
}