This Custom Activity is built using Twilio API for WhatsApp and has the following prerequisites 

registration for a free account in Twillio.com.

noting down the Account Sid, authorization token and the WhatsApp number for the Twilio WhatsApp sandbox.

add the WhatsApp number you want to the send to the whitelist for Twillio sandbox.

This Custom Activity consists of sending WhatsApp messages from UiPath 

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Where do we get AccountSid and AuthToken???? 

Although I have a Twilio account and I have put in the correct details, I am getting this error: "Could not load file or assembly 'Twilio, Version=5.40.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies."

The other official Twilio activity 'Send SMS' is working correctly, so not sure why this is failing. Pls help. 

Hi i have placed all the information correctly and the bot is not sending an error but the message from the messagesent output is "Message could not be sent"

Any configuration needs to be done from the API or sandbox?

This custom activity of sending Whatsapp message from Uipath is created as part of the Hackathon for Visual studio extension for creating Custom Activities in Uipath. 

WhatsApp Activity

WhatsApp Activity

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How To