# Get an Event Subscription

**GET /groups/{groupId}/apps/{appId}/event_subscriptions/{eventSubscriptionId}**

Return information about an event subscription.


## Servers
- The root API resource and starting point for the App Services API.: https://services.cloud.mongodb.com/api/admin/v3.0 (The root API resource and starting point for the App Services API.)


## Authentication methods
- Token auth


## Parameters

### Path parameters
- **groupId** (string)
  An Atlas [Project/Group
  ID](https://docs.atlas.mongodb.com/tutorial/manage-projects/).
- **appId** (string)
  The ObjectID of your application.
  [The App Services API Project and Application IDs section](#section/Project-and-Application-IDs) demonstrates how to find this
  value.
- **eventSubscriptionId** (string)
  The unique `_id` value of an event subscription.



## Responses
### 200
Success.

#### Body: application/json (object)
- **_id** (string)
  The trigger's unique ID.
- **name** (string)
  The trigger's name.
- **type** (string)
  The trigger type. For database triggers, this value is always `"DATABASE"`.
- **disabled** (boolean)
  If `true`, the trigger is disabled and does not listen for events or execute.
- **config** (object)
  An object that defines configuration values for the trigger.
- **function_id** (string)
  The ID of the function that the trigger calls when it fires.

  This value is the same as `event_processors.FUNCTION.function_id`.
  You can either define the value here or in `event_processors.FUNCTION.function_id`.
  The App Services backend duplicates the value to the configuration location where you did not define it.

  For example, if you define `function_id`, the backend duplicates it to `event_processors.FUNCTION.function_id`.

  If you define `function_id`, `event_processors` is not required. You must provide either `function_id` or
  `event_processors` when updating a trigger.
- **function_name** (string)
  The name of the function that the trigger calls when it
  fires, i.e. the function described by `function_id`.

  This value is the same as `event_processors.FUNCTION.function_name`.
  You can either define the value here or in `event_processors.FUNCTION.function_name`.
  The App Services backend duplicates the value to the configuration location where you did not define it.

  For example, if you define `function_name`, the backend duplicates it to `event_processors.FUNCTION.function_name`.

  If you define `function_name`, `event_processors` is not required. You must provide either `function_name` or
  `event_processors` when updating a trigger.
- **event_processors** (object)
  An object where each field name is an event processor ID and
  each value is an object that configures its corresponding
  event processor. For an example configuration object, see
  [Send Trigger Events to AWS
  EventBridge](https://www.mongodb.com/zh-cn/docs/atlas/app-services/triggers/aws-eventbridge#std-label-event_processor_example).
- **error_handler** (object)
  An object that defines custom error handling for an AWS 
  EventBridge trigger. Valid only for `"DATABASE"` type triggers 
  with `"AWS_EVENTBRIDGE"` event processors. 


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