I need a custom-built script or lightweight tool that can scan large batches of phone numbers and tell me, with high accuracy, which ones are no longer reachable on WhatsApp—either because the user has deleted the account, been blocked by WhatsApp, or is otherwise inactive. Here is what I’m after: • Input: a CSV or TXT file with thousands of numbers in mixed international formats. • Process: your own logic (no external paid API) that pings or otherwise tests each number behind the scenes without triggering spam flags, then classifies the result as active or inactive/blocked. • Output: a clear report—CSV or JSON is fine—showing the original number, its status, and a short reason code. Accuracy and speed matter more than fancy UI, but the solution should run on a standard Linux server or as a portable Python/Node script. Basic setup instructions must be included so I can replicate the results on fresh datasets. When you respond, please attach or link to past work that proves you’ve done large-scale WhatsApp or similar messaging validations before. If you already have a demo, let me know and I’ll provide a small sample list for testing.