Create README.md

Author: brenduh

Integration/RESTMessageV2/UPS Tracking/README.md

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+This script calls the UPS tracking API.
+
+UPS Developer Account:
+Sign up at https://developer.ups.com
+Create an App to get credentials
+1. Client ID
+2. Client Secret
+
+How to use:
+Replace YOUR_CLIENT_ID and YOUR_CLIENT_SECRET with your UPS credentials.
+Use the sandbox URL (wwwcie.ups.com) for testing and production URL (onlinetools.ups.com) for live data.
+You can move this logic into a Script Include and call it from a Flow, Business Rule, or Catalog Client Script.
+For security, store credentials in a Connection & Credential Alias and reference them in the script instead of hardcoding.