# Update Callbacks

Update the configured callback URLs for the specified application.

Endpoint: POST /v1/configuration/callbacks/applications/{applicationkey}
Version: 1.0.1
Security: Basic, Signed

## Path parameters:

  - `applicationkey` (string, required)
    The unique identifying key of the application.
    Example: "94983f76-1161-6655-9515-4785c7b67dd8"

## Request fields (application/json):

  - `url` (object)
    Contains primary and or fallback callback URLs

  - `url.primary` (string)
    Your primary callback URL
    Example: "http://primary.yourcallback.com/"

  - `url.fallback` (string)
    Your fallback callback URL (returned if configured). It is used only if Sinch platform gets a timeout or error from your primary callback URL.
    Example: "http://fallback.yourcallback.com/"


## Response 204 fields