Using the Twilio REST API in a non-US Region

This guide will show you how to manage resources in your target Twilio Region with Twilio’s REST API. By the end of the guide, you’ll learn:

• How to select a target Region for API requests
• How to authenticate requests using Region-specific credentials
• How to interact with various Region-specific resources using the API
• Selecting a target Region using Twilio helper libraries

Note that this guide uses examples that utilize the cURL command-line utility for making API requests, rather than one of Twilio’s language-specific helper libraries. This choice is intended to highlight the principles of Twilio’s REST API by avoiding the use of higher level abstractions that tend to obscure some of these details.

Select a target Region for your API requests

The Twilio REST API operates on a per-Region basis. When making requests to the API, it’s up to you to select which Region will handle the request. Whichever Region you choose will be the Region that processes and stores data related to the request.

If you don’t specify a target Region for a request, the request will be handled in the default US1 Region.

To specify a target Region for a request, include the name of the target Region in the request’s hostname, also known as the fully qualified domain name (FQDN).

The Twilio API’s FQDN format

The FQDN format follows a convention that encodes three pieces of information in the hostname:

1. The Twilio Product
2. The target Edge Location
3. The target Region

The format of an FQDN is:

{product}.{edge-location}.{region}.twilio.com

Some example FQDNs targeting API products in different Regions (through various Edge Locations) include:

Twilio server-side helper libraries

When making requests using any of Twilio’s server-side helper libraries, you don’t need to worry about constructing an FQDN. Instead, provide the client constructor with an edge and region parameter, and the client will construct the FQDN accordingly.

Region-specific authentication credentials

In order to provide Region-specific access control, Twilio manages your accounts’ API credentials on a per-Region basis. This means that you’ll need to use different Auth Tokens and API Keys based on which Region you are sending API requests to. Refer to the Twilio Regions overview for more information about the Region isolation model.

You can manage API Keys for a Region using the Twilio Console or the REST API. See our guide to managing Regional API credentials for complete instructions.

Other Region-specific resources

Most Twilio resources can be managed via REST API in a target Region using standard API Keys which exist in the Region.

For example, to list your account’s TwiML Applications in the AU1 region using cURL (again with the appropriate environment variables present in your shell):

curl -u $API_KEY_SID:$API_KEY_SECRET \
  https://api.sydney.au1.twilio.com/2010-04-01/Accounts/$ACCOUNT_SID/Applications.json

Next steps

To learn more about building with Twilio’s Global infrastructure, check out these other resources:

• Make an outbound call using the Twilio REST API in a non-US Region