Action Schema
Once you’ve selected an app, we can fetch the list of available actions for a selected App by making a request to the /actions endpoint: 
// GET /actions?app=4b3920d6-1d5a-4071-b837-9383dc511b80&action_type=READ
{
  "data": [
    {
      "type": "action",
      "id": "core:853266",
      "action_type": "READ",
      "title": "New Lead",
      "description": "Triggers when a new lead is added to SuperExampleCRM",
      "is_instant": true
    },
    {
      "type": "action",
      "id": "uag:1f188536-6dd0-4172-8414-2b90914ddee9",
      "action_type": "READ",
      "title": "New Deal",
      "description": "Triggers when a new deal is added to SuperExampleCRM",
      "is_instant": false
    }
  ]
}
READ and WRITE map to Trigger and Action respectively In the Zapier ecosystem.
Our user can then select one of these Actions that they wish to use as the Trigger for their Zap. The id field is accepted in several other endpoints.
Looking to focus your experience to just a few actions? Check out Hardcoding an Action.