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This is a simple key menu response for WhatsApp, using Twilio programmable WhatsApp messenging communication gateway and the code resides in Twilio Function, a serverless function as a service. The function is triggered whenever a message is send to a Whatsapp number (routing to Twilio Whatsapp Gateway) and invokes or trigger the Twilio function. You can setup the function or code in other cloud platform. A serverless event triggered function is used for simplicity as it performs a simple task.

Twilio function has a maximum runtime of 5s, anything that exceed will be terminated. Nodejs is the only runtime environment currently supported.

To invokve the function, you can send a HTTPS message to the function URL, this is good for testing.