With version 2.17.20 update, WhatsApp has finally build the interface to Siri. This enables you to read out the last received messages in WhatsApp, send out WhatsApp message or make calls via WhatsApp, all through issuing voice commands to Siri.
When you first ask Siri to read out your WhatsApp messages, Siri would prompt you to grant him/her permission to access WhatsApp data. You’re good to go once you answered “Yes”.
Simply issue the command “Read my WhatsApp messages” to Siri to listen to your recent WhatsApp messages.