Create a conversational voicebot using WhatsApp and Watson services

Note: This code pattern uses the classic Watson Assistant experience. After October 8, 2021, all instances (except the standard plan) can switch between the classic and new Watson Assistant experiences by going to the upper-right corner of the Watson Assistant screen and clicking the Manage icon. In this code pattern, build a framework that lets users send voice queries using the WhatsApp application and get a response from IBM Watson Assistant. The query from the user is sent to the Watson Speech to Text Service through a custom application. The output from the Watson Speech to Text Service is then fed to Watson Assistant.