Set up once. Invoices upload to Drive automatically and a link is sent on WhatsApp.
1
Open script.google.com → New Project
2
Tap 📋 Copy Script below → delete all code in editor → paste → Save (💾)
3
Deploy → New deployment → Web app
4
Execute as: Me | Who has access: Anyone → Deploy → Authorize → copy URL
5
Paste the deployment URL below (starts with https://script.google.com/macros/s/) → tap Save
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If already set up: tap Copy Script again, paste new code in script editor, do New deployment (not edit existing), paste new URL
