# Using triggers

> **This page will take you through what endpoints are involved in discovering and using triggers and their operations.** 

## Discovering triggers

The [Get triggers endpoint](https://tray.ai/documentation/developer/platform-apis/triggers#endpoint-get-triggers) will return all of the triggers that you have access to:

The response includes:

* trigger name

* trigger version

These can then be used with the [Get trigger operations endpoint](https://tray.ai/documentation/developer/platform-apis/triggers#endpoint-get-trigger-operations) to list the available operations within a particular trigger.

So if your organization has access to Calendly and Typeform you would see the following:

```json
{
    "elements": [
        {
            "name": "calendly-trigger",
            "version": "3.0",
            "title": "Calendly",
            "description": "Calendly helps you schedule meetings without the back-and-forth emails.",
            "service": {
                "id": "8e1e2aa9-877b-4710-9acb-5c8ff9dd8059",
                "name": "calendly",
                "version": 2
            }
        },
        {
            "name": "typeform-trigger",
            "version": "4.1",
            "title": "Typeform",
            "description": "Typeform is an online software as a service company that specializes in online form building and online surveys.",
            "service": {
                "id": "668f2ac5-2b44-41c5-a751-4a9773982c3e",
                "name": "typeform",
                "version": 3
            }
        }
    ]
}
```

## Discovering operations

The operations available within a trigger can be identified using the [Get trigger operations endpoint](https://tray.ai/documentation/developer/platform-apis/triggers#endpoint-get-trigger-operations).

So for `Calendly` the URL would be:

<https://api.tray.io/core/v1/triggers/calendly-trigger/versions/3.0/operations>

In the following sample response for `Calendly`, we have shown only the input schema for the `webhook` operation.

```json
{
    "elements": [
        {
            "name": "webhook",
            "title": "Webhook",
            "description": "Receive Calendly appointment data in real-time. (Invitee Created Event & Invitee Canceled Events)",
            "inputSchema": {
                "type": "object",
                "properties": {
                    "events": {
                        "type": "array",
                        "description": "List of user events to subscribe to.",
                        "title": "Events",
                        "items": {
                            "type": "string",
                            "enum": [
                                {
                                    "text": "Invitee Created Events",
                                    "value": "invitee.created"
                                },
                                {
                                    "text": "Invitee Canceled Events",
                                    "value": "invitee.canceled"
                                }
                            ],
                            "description": "Event to subscribe to.",
                            "title": "Item"
                        },
                        "additionalItems": true
                    },
                    "scope": {
                        "type": "string",
                        "enum": [
                            {
                                "text": "Organization",
                                "value": "organization"
                            },
                            {
                                "text": "User",
                                "value": "user"
                            }
                        ],
                        "default": "organization",
                        "description": "Indicates if the webhook subscription scope will be 'Organization' or 'User'.",
                        "title": "Scope"
                    },
                    "organization_uri": {
                        "type": "string",
                        "title": "Organization URI",
                        "description": "The unique reference to the organization that the webhook will be tied to."
                    },
                    "user_uri": {
                        "type": "string",
                        "title": "User URI",
                        "description": "The unique reference to the user that the webhook will be tied to. Required if 'Scope' is set to 'User'."
                    },
                    "public_url": {
                        "type": "string",
                        "default_jsonpath": "$.env.public_url",
                        "title": "Public URL"
                    }
                },
                "required": [
                    "events",
                    "scope",
                    "organization_uri",
                    "public_url"
                ],
                "advanced": [
                    "public_url"
                ],
                "$schema": "http://json-schema.org/draft-04/schema#",
                "additionalProperties": false
            },
            "authScopes": []
        }
    ]
}
```

The Trigger details (name and version) and operation deatils (name, inputSchema) are essential in forming the request payload for [Create Subscription](https://tray.ai/documentation/developer/platform-apis/triggers#endpoint-create-subscription) call.