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REST API: UsageTrigger


A UsageTrigger is a webhook that notifies your application of usage thresholds.

(information)

Info

Twilio can send your web application an HTTP request when certain events happen, such as an incoming text message to one of your Twilio phone numbers. These requests are called webhooks, or status callbacks. For more, check out our guide to Getting Started with Twilio Webhooks. Find other webhook pages, such as a security guide and an FAQ in the Webhooks section of the docs.

(warning)

Warning

It can take some amount of time for the data used by usage triggers to be reflected in the UsageTriggers evaluations.

Using this resource, you can make or update a new UsageTrigger, fetch information about an existing UsageTrigger or multiple UsageTriggers, or delete an existing UsageTrigger.

You can configure UsageTriggers to recur daily, monthly, or yearly. UsageTriggers are evaluated frequently — about once a minute — to provide timely information to your application.

You can also set UsageTriggers for any usage category. For example, you can create a single UsageTrigger to track daily usage. In this case, a UsageTrigger notifies your application when your cost exceeds a set daily amount. If used together with Subaccounts created for each end-user, then a UsageTrigger would notify your application that a specific user has exceeded an allocated monthly usage.

(information)

Info

For more information, see Usage categories in Usage Records as well as Subaccounts.


UsageTrigger Properties

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A UsageTrigger is represented by the following properties:

Resource properties
account_sidtype: SID<AC>Not PII

api_versiontype: stringNot PII

The API version used to create the resource.


callback_methodtype: enum<HTTP METHOD>Not PII

The HTTP method we use to call callback_url. Can be: GET or POST.

Possible values:
HEADGETPOSTPATCHPUTDELETE

callback_urltype: string<URI>PII MTL: 60 days

The URL we call using the callback_method when the trigger fires.


current_valuetype: stringNot PII

The current value of the field the trigger is watching.


date_createdtype: string<DATE TIME RFC 2822>Not PII

The date and time in GMT that the resource was created specified in RFC 2822(link takes you to an external page) format.


date_firedtype: string<DATE TIME RFC 2822>Not PII

The date and time in GMT that the trigger was last fired specified in RFC 2822(link takes you to an external page) format.


date_updatedtype: string<DATE TIME RFC 2822>Not PII

The date and time in GMT that the resource was last updated specified in RFC 2822(link takes you to an external page) format.


friendly_nametype: stringNot PII

The string that you assigned to describe the trigger.


recurringtype: enum<STRING>Not PII

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.

Possible values:
dailymonthlyyearlyalltime

sidtype: SID<UT>Not PII

The unique string that that we created to identify the UsageTrigger resource.


trigger_bytype: enum<STRING>Not PII

The field in the UsageRecord(link takes you to an external page) resource that fires the trigger. Can be: count, usage, or price, as described in the UsageRecords documentation(link takes you to an external page).

Possible values:
countusageprice

trigger_valuetype: stringNot PII

The value at which the trigger will fire. Must be a positive, numeric value.


uritype: stringNot PII

The URI of the resource, relative to https://api.twilio.com.


usage_categorytype: enum<STRING>Not PII

The usage category the trigger watches. Must be one of the supported usage categories(link takes you to an external page).


usage_record_uritype: stringNot PII

The URI of the UsageRecord(link takes you to an external page) resource this trigger watches, relative to https://api.twilio.com.


When an account's usage category crosses a UsageTrigger's TriggerValue during the specified interval, then Twilio makes a request to the CallbackUrl using the HTTP method CallbackMethod with the CallbackUrl Request parameters.

Twilio guarantees that a UsageTrigger will fire once (at most) during its recurring interval and will quickly retry the callback URL three times after a 5xx error.

(information)

Info

For more information, see CallbackUrl Request Parameters below.


Create a UsageTrigger Resource

create-a-usagetrigger-resource page anchor
POST https://api.twilio.com/2010-04-01/Accounts/{AccountSid}/Usage/Triggers.json

Each account can create up to 1,000 UsageTriggers. If UsageTrigger creation is successful, Twilio will respond with a representation of the new trigger.

(warning)

Warning

Inactive UsageTriggers will not be deleted automatically.

You need to delete triggers you no longer need. For more information, see Delete a UsageTrigger resource below.

Parameters

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URI parameters
AccountSidtype: SID<AC>Not PII
Path Parameter

The SID of the Account(link takes you to an external page) that will create the resource.


Request body parameters
CallbackUrltype: string<URI>PII MTL: 60 days
Required

The URL we should call using callback_method when the trigger fires.


TriggerValuetype: stringNot PII
Required

The usage value at which the trigger should fire. For convenience, you can use an offset value such as +30 to specify a trigger_value that is 30 units more than the current usage value. Be sure to urlencode a + as %2B.


UsageCategorytype: enum<STRING>Not PII
Required

The usage category that the trigger should watch. Use one of the supported usage categories(link takes you to an external page) for this value.


CallbackMethodtype: enum<HTTP METHOD>Not PII

The HTTP method we should use to call callback_url. Can be: GET or POST and the default is POST.

Possible values:
HEADGETPOSTPATCHPUTDELETE

FriendlyNametype: stringNot PII

A descriptive string that you create to describe the resource. It can be up to 64 characters long.


Recurringtype: enum<STRING>Not PII

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.

Possible values:
dailymonthlyyearlyalltime

TriggerBytype: enum<STRING>Not PII

The field in the UsageRecord(link takes you to an external page) resource that should fire the trigger. Can be: count, usage, or price as described in the UsageRecords documentation(link takes you to an external page). The default is usage.

Possible values:
countusageprice

Create a new UsageTrigger with parameters

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Node.js
Python
C#
Java
PHP
Ruby
curl

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// Download the Node helper library from twilio.com/docs/node/install
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// These consts are your accountSid and authToken from https://www.twilio.com/console
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// To set up environmental variables, see http://twil.io/secure
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const accountSid = process.env.TWILIO_ACCOUNT_SID;
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const authToken = process.env.TWILIO_AUTH_TOKEN;
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const client = require('twilio')(accountSid, authToken);
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client.usage.triggers
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.create({
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triggerValue: '1000',
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usageCategory: 'sms',
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callbackUrl: 'http://www.example.com/',
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})
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.then(trigger => process.stdout.write(trigger.sid));

Output

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{
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"usage_record_uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Records.json?Category=sms",
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"date_updated": "Sat, 13 Oct 2012 21:32:30 +0000",
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"date_fired": null,
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"friendly_name": "Trigger for sms at usage of 1000",
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"uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Triggers/UTc142bed7b38c4f8186ef41a309814fd2.json",
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"account_sid": "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"callback_method": "POST",
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"trigger_by": "usage",
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"sid": "UTc142bed7b38c4f8186ef41a309814fd2",
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"current_value": "57",
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"date_created": "Sat, 13 Oct 2012 21:32:30 +0000",
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"callback_url": "http://www.example.com",
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"recurring": null,
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"usage_category": "sms",
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"trigger_value": "1000.000000"
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}

Node.js
Python
C#
Java
Go
PHP
Ruby
twilio-cli
curl

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// Download the helper library from https://www.twilio.com/docs/node/install
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// Find your Account SID and Auth Token at twilio.com/console
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// and set the environment variables. See http://twil.io/secure
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const accountSid = process.env.TWILIO_ACCOUNT_SID;
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const authToken = process.env.TWILIO_AUTH_TOKEN;
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const client = require('twilio')(accountSid, authToken);
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client.usage.triggers
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.create({
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callbackUrl: 'https://example.com',
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triggerValue: 'trigger_value',
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usageCategory: 'a2p-registration-fees'
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})
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.then(trigger => console.log(trigger.sid));

Output

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{
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"account_sid": "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"api_version": "2010-04-01",
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"callback_method": "GET",
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"callback_url": "http://cap.com/streetfight",
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"current_value": "0",
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"date_created": "Sun, 06 Sep 2015 12:58:45 +0000",
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"date_fired": null,
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"date_updated": "Sun, 06 Sep 2015 12:58:45 +0000",
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"friendly_name": "raphael-cluster-1441544325.86",
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"recurring": "yearly",
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"sid": "UTXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"trigger_by": "price",
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"trigger_value": "50",
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"uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Triggers/UTXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"usage_category": "totalprice",
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"usage_record_uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Records?Category=totalprice"
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}


Fetch a UsageTrigger resource

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GET https://api.twilio.com/2010-04-01/Accounts/{AccountSid}/Usage/Triggers/{Sid}.json

URI parameters
AccountSidtype: SID<AC>Not PII
Path Parameter

The SID of the Account(link takes you to an external page) that created the UsageTrigger resource to fetch.


Sidtype: SID<UT>Not PII
Path Parameter

The Twilio-provided string that uniquely identifies the UsageTrigger resource to fetch.

Fetch a UsageTrigger resource

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Node.js
Python
C#
Java
PHP
Ruby
curl

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// Download the Node helper library from twilio.com/docs/node/install
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// These consts are your accountSid and authToken from https://www.twilio.com/console
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// To set up environmental variables, see http://twil.io/secure
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const accountSid = process.env.TWILIO_ACCOUNT_SID;
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const authToken = process.env.TWILIO_AUTH_TOKEN;
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const client = require('twilio')(accountSid, authToken);
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client.usage
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.triggers('UT33c6aeeba34e48f38d6899ea5b765ad4')
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.fetch()
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.then(trigger => trigger.currentValue);

Output

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{
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"usage_record_uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Records.json?Category=calls",
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"date_updated": "Sat, 29 Sep 2012 19:47:54 +0000",
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"date_fired": null,
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"friendly_name": "Trigger for calls at usage of 500",
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"uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Triggers/UT33c6aeeba34e48f38d6899ea5b765ad4.json",
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"account_sid": "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"callback_method": "POST",
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"trigger_by": "usage",
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"sid": "UT33c6aeeba34e48f38d6899ea5b765ad4",
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"current_value": "21",
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"date_created": "Sat, 29 Sep 2012 19:45:43 +0000",
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"callback_url": "http://www.example.com/",
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"recurring": null,
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"usage_category": "calls",
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"trigger_value": "500.000000"
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}

Node.js
Python
C#
Java
Go
PHP
Ruby
twilio-cli
curl

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// Download the helper library from https://www.twilio.com/docs/node/install
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// Find your Account SID and Auth Token at twilio.com/console
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// and set the environment variables. See http://twil.io/secure
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const accountSid = process.env.TWILIO_ACCOUNT_SID;
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const authToken = process.env.TWILIO_AUTH_TOKEN;
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const client = require('twilio')(accountSid, authToken);
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client.usage.triggers('UTXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX')
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.fetch()
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.then(trigger => console.log(trigger.friendlyName));

Output

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{
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"account_sid": "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"api_version": "2010-04-01",
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"callback_method": "GET",
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"callback_url": "http://cap.com/streetfight",
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"current_value": "0",
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"date_created": "Sun, 06 Sep 2015 12:58:45 +0000",
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"date_fired": null,
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"date_updated": "Sun, 06 Sep 2015 12:58:45 +0000",
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"friendly_name": "raphael-cluster-1441544325.86",
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"recurring": "yearly",
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"sid": "UTXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"trigger_by": "price",
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"trigger_value": "50",
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"uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Triggers/UTXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"usage_category": "totalprice",
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"usage_record_uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Records?Category=totalprice"
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}


Read multiple UsageTrigger resources

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GET https://api.twilio.com/2010-04-01/Accounts/{AccountSid}/Usage/Triggers.json

URI parameters
AccountSidtype: SID<AC>Not PII
Path Parameter

The SID of the Account(link takes you to an external page) that created the UsageTrigger resources to read.


Recurringtype: enum<STRING>Not PII
Query Parameter

The frequency of recurring UsageTriggers to read. Can be: daily, monthly, or yearly to read recurring UsageTriggers. An empty value or a value of alltime reads non-recurring UsageTriggers.

Possible values:
dailymonthlyyearlyalltime

TriggerBytype: enum<STRING>Not PII
Query Parameter

The trigger field of the UsageTriggers to read. Can be: count, usage, or price as described in the UsageRecords documentation(link takes you to an external page).

Possible values:
countusageprice

UsageCategorytype: enum<STRING>Not PII
Query Parameter

The usage category of the UsageTriggers to read. Must be a supported usage categories(link takes you to an external page).


PageSizetype: integerNot PII
Query Parameter

How many resources to return in each list page. The default is 50, and the maximum is 1000.


Pagetype: integerNot PII
Query Parameter

The page index. This value is simply for client state.


PageTokentype: stringNot PII
Query Parameter

The page token. This is provided by the API.

Read multiple UsageTrigger resources

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Node.js
Python
C#
Java
PHP
Ruby
curl

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// Download the Node helper library from twilio.com/docs/node/install
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// These consts are your accountSid and authToken from https://www.twilio.com/console
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// To set up environmental variables, see http://twil.io/secure
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const accountSid = process.env.TWILIO_ACCOUNT_SID;
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const authToken = process.env.TWILIO_AUTH_TOKEN;
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const client = require('twilio')(accountSid, authToken);
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const filterOpts = {
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recurring: 'daily',
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usageCategory: 'calls',
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};
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client.usage.triggers.each(filterOpts, trigger =>
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console.log(trigger.currentValue)
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);

Output

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{
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"first_page_uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Triggers/.json?UsageCategory=calls&Recurring=daily&Page=0&PageSize=50",
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"previous_page_uri": null,
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"usage_triggers": [
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{
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"usage_record_uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Records/Today.json?Category=calls",
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"date_updated": "Sat, 29 Sep 2012 19:42:57 +0000",
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"date_fired": null,
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"friendly_name": "a trigger",
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"uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Triggers//UTc2db285b0cbf4c60a2f1a8db237a5fba.json",
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"account_sid": "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"callback_method": "POST",
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"trigger_by": "count",
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"sid": "UTc2db285b0cbf4c60a2f1a8db237a5fba",
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"current_value": "0",
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"date_created": "Sun, 23 Sep 2012 23:07:29 +0000",
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"callback_url": "http://www.google.com",
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"recurring": "daily",
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"usage_category": "calls",
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"trigger_value": "0.000000"
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}
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],
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"uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Triggers.json?UsageCategory=calls&Recurring=daily",
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"page_size": 50,
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"next_page_uri": null,
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"page": 0
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}

List multiple UsageTriggers

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Node.js
Python
C#
Java
Go
PHP
Ruby
twilio-cli
curl

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// Download the helper library from https://www.twilio.com/docs/node/install
_10
// Find your Account SID and Auth Token at twilio.com/console
_10
// and set the environment variables. See http://twil.io/secure
_10
const accountSid = process.env.TWILIO_ACCOUNT_SID;
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const authToken = process.env.TWILIO_AUTH_TOKEN;
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const client = require('twilio')(accountSid, authToken);
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client.usage.triggers.list({limit: 20})
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.then(triggers => triggers.forEach(t => console.log(t.sid)));

Output

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{
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"end": 0,
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"first_page_uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Triggers?PageSize=1&Page=0",
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"last_page_uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Triggers?PageSize=1&Page=626",
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"next_page_uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Triggers?PageSize=1&Page=1",
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"num_pages": 627,
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"page": 0,
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"page_size": 1,
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"previous_page_uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Triggers?PageSize=1&Page=0",
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"start": 0,
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"total": 627,
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"uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Triggers",
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"usage_triggers": [
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{
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"account_sid": "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"api_version": "2010-04-01",
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"callback_method": "GET",
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"callback_url": "http://cap.com/streetfight",
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"current_value": "0",
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"date_created": "Sun, 06 Sep 2015 12:58:45 +0000",
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"date_fired": null,
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"date_updated": "Sun, 06 Sep 2015 12:58:45 +0000",
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"friendly_name": "raphael-cluster-1441544325.86",
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"recurring": "yearly",
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"sid": "UTXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"trigger_by": "price",
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"trigger_value": "50",
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"uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Triggers/UTXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"usage_category": "totalprice",
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"usage_record_uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Records?Category=totalprice"
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}
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]
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}


Update a UsageTrigger Resource

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POST https://api.twilio.com/2010-04-01/Accounts/{AccountSid}/Usage/Triggers/{Sid}.json

Attempts a UsageTrigger's properties update and, if successful, returns the updated resource representation.

The returned response is identical to the returned response of a GET request.

URI parameters
AccountSidtype: SID<AC>Not PII
Path Parameter

The SID of the Account(link takes you to an external page) that created the UsageTrigger resources to update.


Sidtype: SID<UT>Not PII
Path Parameter

The Twilio-provided string that uniquely identifies the UsageTrigger resource to update.


Request body parameters
CallbackMethodtype: enum<HTTP METHOD>Not PII

The HTTP method we should use to call callback_url. Can be: GET or POST and the default is POST.

Possible values:
HEADGETPOSTPATCHPUTDELETE

CallbackUrltype: string<URI>PII MTL: 60 days

The URL we should call using callback_method when the trigger fires.


FriendlyNametype: stringNot PII

A descriptive string that you create to describe the resource. It can be up to 64 characters long.

Update a UsageTrigger Resource

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Node.js
Python
C#
Java
PHP
Ruby
curl

_14
// Download the Node helper library from twilio.com/docs/node/install
_14
// These consts are your accountSid and authToken from https://www.twilio.com/console
_14
// To set up environmental variables, see http://twil.io/secure
_14
const accountSid = process.env.TWILIO_ACCOUNT_SID;
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const authToken = process.env.TWILIO_AUTH_TOKEN;
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const client = require('twilio')(accountSid, authToken);
_14
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client.usage
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.triggers('UT33c6aeeba34e48f38d6899ea5b765ad4')
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.update({
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friendlyName: 'Monthly Maximum Call Usage',
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callbackUrl: 'https://www.example.com/monthly-usage-trigger',
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})
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.then(trigger => console.log(trigger.dateFired));

Output

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{
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"usage_record_uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Records.json?Category=calls",
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"date_updated": "Sat, 13 Oct 2012 21:24:35 +0000",
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"date_fired": null,
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"friendly_name": "Monthly Maximum Call Usage",
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"uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Triggers/UT33c6aeeba34e48f38d6899ea5b765ad4.json",
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"account_sid": "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"callback_method": "POST",
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"trigger_by": "usage",
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"sid": "UT33c6aeeba34e48f38d6899ea5b765ad4",
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"current_value": "21",
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"date_created": "Sat, 29 Sep 2012 19:45:43 +0000",
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"callback_url": "https://www.example.com/monthly-usage-trigger",
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"recurring": null,
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"usage_category": "calls",
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"trigger_value": "500.000000"
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}

(warning)

Warning

Currently, you cannot update the category or value of an existing UsageTrigger. Instead, use POST to create a new UsageTrigger and use DELETE to remove an old UsageTrigger.

Node.js
Python
C#
Java
Go
PHP
Ruby
twilio-cli
curl

_10
// Download the helper library from https://www.twilio.com/docs/node/install
_10
// Find your Account SID and Auth Token at twilio.com/console
_10
// and set the environment variables. See http://twil.io/secure
_10
const accountSid = process.env.TWILIO_ACCOUNT_SID;
_10
const authToken = process.env.TWILIO_AUTH_TOKEN;
_10
const client = require('twilio')(accountSid, authToken);
_10
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client.usage.triggers('UTXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX')
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.update({callbackMethod: 'GET'})
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.then(trigger => console.log(trigger.friendlyName));

Output

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{
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"account_sid": "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"api_version": "2010-04-01",
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"callback_method": "GET",
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"callback_url": "http://cap.com/streetfight",
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"current_value": "0",
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"date_created": "Sun, 06 Sep 2015 12:58:45 +0000",
_18
"date_fired": null,
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"date_updated": "Sun, 06 Sep 2015 12:58:45 +0000",
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"friendly_name": "raphael-cluster-1441544325.86",
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"recurring": "yearly",
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"sid": "UTXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"trigger_by": "price",
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"trigger_value": "50",
_18
"uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Triggers/UTXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"usage_category": "totalprice",
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"usage_record_uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Usage/Records?Category=totalprice"
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}


Delete a UsageTrigger resource

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DELETE https://api.twilio.com/2010-04-01/Accounts/{AccountSid}/Usage/Triggers/{Sid}.json

URI parameters
AccountSidtype: SID<AC>Not PII
Path Parameter

The SID of the Account(link takes you to an external page) that created the UsageTrigger resources to delete.


Sidtype: SID<UT>Not PII
Path Parameter

The Twilio-provided string that uniquely identifies the UsageTrigger resource to delete.

Node.js
Python
C#
Java
Go
PHP
Ruby
twilio-cli
curl

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// Download the helper library from https://www.twilio.com/docs/node/install
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// Find your Account SID and Auth Token at twilio.com/console
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// and set the environment variables. See http://twil.io/secure
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const accountSid = process.env.TWILIO_ACCOUNT_SID;
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const authToken = process.env.TWILIO_AUTH_TOKEN;
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const client = require('twilio')(accountSid, authToken);
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client.usage.triggers('UTXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX').remove();

UsageTrigger Callbacks

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As soon as the usage value of a UsageTrigger exceeds the TriggerValue, the trigger will fire and Twilio will make an asynchronous HTTP request to the UsageTrigger's CallbackUrl. This request will typically take place within a minute of exceeding the usage threshold.

CallbackUrl request parameters

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Twilio will pass the following parameters to the UsageTrigger's CallbackUrl:

ParameterDescription
AccountSidYour Twilio account id. It is 34 characters long and always starts with the letters AC
UsageTriggerSidUnique identifier of the fired UsageTrigger.
DateFiredDate when the UsageTrigger fired, in GMT.
RecurringHow the fired UsageTrigger recurs. For non-recurring UsageTriggers: leave empty. For recurring UsageTriggers: choose daily, monthly, or yearly.
UsageCategoryUsage category watched by the UsageTrigger: choose from supported usage categories.
TriggerByUsageRecord field that fires the UsageTrigger: choose from count, usage, or price.
TriggerValueValue at which the UsageTrigger fired.
CurrentValueThe current value of the usage watched by the UsageTrigger.
UsageRecordUriURI of the UsageRecord that this UsageTrigger watched when it fired.
IdempotencyTokenA random token generated by Twilio and guaranteed to be unique for this particular firing of this UsageTrigger.

Best practices with UsageTrigger callbacks

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When implementing a handler for UsageTrigger's CallbackUrl, your handler may receive HTTP requests more than once. Services that handle duplicate requests and return the same response are called Idempotence.

We give you an IdempotencyToken that is unique for each Usage Trigger callback.

(information)

Info

For more information about Idempotence, see this wiki page(link takes you to an external page).

Example: daily recurring UsageTrigger's idempotency token

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ACed70abd024d3f57a4027b5dc2ca88d5b-FIRES-UTc142bed7b38c4f8186ef41a309814fd2-2012-10-04

You can keep track of your IdempotencyToken to properly handle requests to your service and prevent a request from performing the same operation twice.

For example, your callback service may send billing notifications via email. For the best possible customer experience, you would want your customers only to receive the billing notification email once.

You can follow the test-and-set (external link) pattern to implement idempotent services. In short, you would test for the existence of the IdempotencyToken before processing your application's logic. This allows your application to handle existing tokens and choose the next appropriate step.

In the email example, you would have already sent the email to your customer then you would skip sending the email, instead replying with an HTTP status code of 200.

(information)

Info

For more information on test-and-set, see this wiki page(link takes you to an external page).


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