The SquareMCP number (+19547385805) is registered under Twilio's BSP,
so direct Meta API sends were blocked with #200 permission errors.
Default account now routes through Twilio's REST API; customer-owned
accounts still use Meta's Cloud API directly.
- twilioSend(): POST to api.twilio.com with Basic auth
- resolveTemplateText(): fetches template body from Meta, substitutes
{{1}}/{{}} parameters, so templates render correctly via Twilio
- Bumped WHATSAPP_API_VERSION to v21.0
- Added TWILIO_ACCOUNT_SID, TWILIO_AUTH_TOKEN, TWILIO_WHATSAPP_NUMBER,
WHATSAPP_DEFAULT_BUSINESS_ACCOUNT_ID to K8s deployment
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
b67146dfc8