Add Payments & WhatsApp Bot

I already have an event-ticketing template built in FlutterFlow. I’d like a developer who can extend it in two key ways:

1. Integrate EcoCash as the in-app payment gateway so guests can complete checkout without leaving the app. The solution must follow EcoCash’s official API flow and handle success, failure, and callback events inside FlutterFlow.

2. Connect the app to a WhatsApp Business bot. Through WhatsApp, users should be able to:
• search events by location or unique code
• buy tickets directly in chat (including EcoCash payment hand-off)
• receive automated event reminders
• get real-time event updates
• ask general support questions and receive scripted or AI-assisted answers

I will provide the current FlutterFlow project, existing Firebase backend, and event data structure. You’ll supply:

• working EcoCash payment module plugged into the current checkout flow
• WhatsApp bot scripts, webhook or cloud function logic, and any middleware required
• clear instructions to deploy keys, environment variables, and run manual tests
• brief documentation so I can maintain or extend the flows later

If you’ve handled EcoCash, FlutterFlow custom actions, or WhatsApp Business Cloud API before, you’ll feel right at home.