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

**GET /marketplace/AvailableAddOns/{AvailableAddOnSid}/Extensions/{Sid}**

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


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


## Authentication methods
- Account sid auth token


## Parameters

### Path parameters
- **AvailableAddOnSid** (string)
  The SID of the AvailableAddOn resource with the extension to fetch.
- **Sid** (string)
  The SID of the AvailableAddOn Extension 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 we created to identify the AvailableAddOnExtension resource.
- **available_add_on_sid** (string | null)
  The SID of the AvailableAddOn resource to which this extension applies.
- **friendly_name** (string | null)
  The string that you assigned to describe the resource.
- **product_name** (string | null)
  The name of the Product this Extension is used within.
- **unique_name** (string | null)
  An application-defined string that uniquely identifies the resource.
- **url** (string(uri) | null)
  The absolute URL of the resource.


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