# Fetch an instance of an Extension for the Assigned Add-on.

**GET /2010-04-01/Accounts/{AccountSid}/IncomingPhoneNumbers/{ResourceSid}/AssignedAddOns/{AssignedAddOnSid}/Extensions/{Sid}.json**

Fetch an instance of an Extension for the Assigned Add-on.


## 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 resource to fetch.
- **ResourceSid** (string)
  The SID of the Phone Number to which the Add-on is assigned.
- **AssignedAddOnSid** (string)
  The SID that uniquely identifies the assigned Add-on installation.
- **Sid** (string)
  The Twilio-provided string that uniquely identifies the resource to fetch.



## 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)
- **sid** (string | null)
  The unique string that that we created to identify the resource.
- **account_sid** (string | null)
  The SID of the [Account](https://www.twilio.com/docs/iam/api/account) that created the resource.
- **resource_sid** (string | null)
  The SID of the Phone Number to which the Add-on is assigned.
- **assigned_add_on_sid** (string | null)
  The SID that uniquely identifies the assigned Add-on installation.
- **friendly_name** (string | null)
  The string that you assigned to describe the resource.
- **product_name** (string | null)
  A string that you assigned to describe the Product this Extension is used within.
- **unique_name** (string | null)
  An application-defined string that uniquely identifies the resource. It can be used in place of the resource's `sid` in the URL to address the resource.
- **uri** (string | null)
  The URI of the resource, relative to `https://api.twilio.com`.
- **enabled** (boolean | null)
  Whether the Extension will be invoked.


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