{"message":"WhatsApp SaaS Backend API","version":"2.2.0","endpoints":{"auth":"/api/auth","apps":"/api/apps","messages":"/api","campaigns":"/api/campaigns","subscriptions":"/api/subscriptions","developerTokens":"/api/developer-tokens","payment":"/api/payment","health":"/health"},"features":["JWT Authentication","Developer Tokens","WhatsApp Multi-tenant","SingPay Integration","Real-time Socket.io"]}