Z-API Omni is a hosted messaging API for developers, software companies, integrators and automation teams building customer communications into applications and workflows. A unified REST API connects WhatsApp, Messenger, Instagram and Telegram, with webhooks for incoming messages and delivery events. WhatsApp channels can use the official Meta API or a web-connected QR-code session. The service sends text, media, buttons, lists and message templates. SDKs are available for JavaScript, Python, PHP, Go and .NET, with Swagger documentation and a Postman collection. Teams can use the API for customer support, order and delivery updates, notifications, appointment reminders, marketing, payments and authentication. A free isolated sandbox supports testing before production; paid subscriptions are priced per channel, with a separate partner plan for higher channel volumes.