# GitHub Copilot Instructions for WhatsApp Gateway
When implementing WhatsApp notifications, OTP, or messaging:
- Use VexaHost WA Gateway REST API: POST https://wa.vexahostcloud.my.id/api/v1/messages/text
- Always read API key from environment variable `WA_GATEWAY_KEY` (Header: `X-Api-Key`)
- Validate phone numbers to support standard Indonesian formats (08... and 62...)
- Avoid throwing fatal exceptions on notification delivery failure.