# Update an instance of a usage trigger

**POST /2010-04-01/Accounts/{AccountSid}/Usage/Triggers/{Sid}.json**

Update an instance of a usage trigger
Webhooks that notify you of usage thresholds

## Servers
- https://api.twilio.com: https://api.twilio.com ()


## Authentication methods
- Account sid auth token


## Parameters

### Path parameters
- **AccountSid** (string)
  The SID of the [Account](https://www.twilio.com/docs/iam/api/account) that created the UsageTrigger resources to update.
- **Sid** (string)
  The Twilio-provided string that uniquely identifies the UsageTrigger resource to update.


### Body: application/x-www-form-urlencoded (object)

- **CallbackMethod** (string(http-method))
  The HTTP method we should use to call `callback_url`. Can be: `GET` or `POST` and the default is `POST`.
- **CallbackUrl** (string(uri))
  The URL we should call using `callback_method` when the trigger fires.
- **FriendlyName** (string)
  A descriptive string that you create to describe the resource. It can be up to 64 characters long.


## Responses
### 200
OK
#### Headers
- **Access-Control-Allow-Origin** (string)
  Specify the origin(s) allowed to access the resource
- **Access-Control-Allow-Methods** (string)
  Specify the HTTP methods allowed when accessing the resource
- **Access-Control-Allow-Headers** (string)
  Specify the headers allowed when accessing the resource
- **Access-Control-Allow-Credentials** (boolean)
  Indicates whether the browser should include credentials
- **Access-Control-Expose-Headers** (string)
  Headers exposed to the client

#### Body: application/json (object)
- **account_sid** (string | null)
  The SID of the [Account](https://www.twilio.com/docs/iam/api/account) that the trigger monitors.
- **api_version** (string | null)
  The API version used to create the resource.
- **callback_method** (string(http-method) | null)
  The HTTP method we use to call `callback_url`. Can be: `GET` or `POST`.
- **callback_url** (string(uri) | null)
  The URL we call using the `callback_method` when the trigger fires.
- **current_value** (string | null)
  The current value of the field the trigger is watching.
- **date_created** (string(date-time-rfc-2822) | null)
  The date and time in GMT that the resource was created specified in [RFC 2822](https://www.ietf.org/rfc/rfc2822.txt) format.
- **date_fired** (string(date-time-rfc-2822) | null)
  The date and time in GMT that the trigger was last fired specified in [RFC 2822](https://www.ietf.org/rfc/rfc2822.txt) format.
- **date_updated** (string(date-time-rfc-2822) | null)
  The date and time in GMT that the resource was last updated specified in [RFC 2822](https://www.ietf.org/rfc/rfc2822.txt) format.
- **friendly_name** (string | null)
  The string that you assigned to describe the trigger.
- **recurring** (string)
  The frequency of a recurring UsageTrigger.  Can be: `daily`, `monthly`, or `yearly` for recurring triggers or empty for non-recurring triggers. A trigger will only fire once during each period. Recurring times are in GMT.
- **sid** (string | null)
  The unique string that that we created to identify the UsageTrigger resource.
- **trigger_by** (string)
  The field in the [UsageRecord](https://www.twilio.com/docs/usage/api/usage-record) resource that fires the trigger.  Can be: `count`, `usage`, or `price`, as described in the [UsageRecords documentation](https://www.twilio.com/docs/usage/api/usage-record#usage-count-price).
- **trigger_value** (string | null)
  The value at which the trigger will fire.  Must be a positive, numeric value.
- **uri** (string | null)
  The URI of the resource, relative to `https://api.twilio.com`.
- **usage_category** (string)
  The usage category the trigger watches. Must be one of the supported [usage categories](https://www.twilio.com/docs/usage/api/usage-record#usage-categories).
- **usage_record_uri** (string | null)
  The URI of the [UsageRecord](https://www.twilio.com/docs/usage/api/usage-record) resource this trigger watches, relative to `https://api.twilio.com`.


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