# Set Preferred Region for VPP App

API to set the preferred App Store region for a VPP app. This region is cached and used when fetching app info from iTunes.

Endpoint: PUT /v2/itunesapps/{appleAppId}/preferred-region
Version: 1.0.0
Security: apiKey

## Path parameters:

  - `appleAppId` (string, required)
    The Apple App Store ID of the VPP app (e.g., "361309726")

## Request fields (application/json):

  - `preferred_region` (string, required)
    ISO 3166-1 alpha-2 country code for the preferred App Store region (e.g., 'US', 'JP')
    Example: "US"

## Response 200 fields (application/json):

  - `content` (object)

  - `content.message` (string)
    Example: "Preferred region updated successfully"

## Response 400 fields (application/json):

  - `code` (integer, required)

  - `message` (string, required)

  - `content` (object)

## Response 401 fields (application/json):

  - `code` (integer, required)

  - `message` (string, required)

  - `content` (object)

## Response 404 fields (application/json):

  - `code` (integer, required)

  - `message` (string, required)

  - `content` (object)

## Response 500 fields (application/json):

  - `code` (integer, required)

  - `message` (string, required)

  - `content` (object)