Hi, @Abdou!
Yes, it is possible.
Fist you need to create you WhatsApp automation with the Template Message you wish to send:

Ignore the trigger for now… 😉
In your IG automation, after collecting the phone number, you can:
- Set an action to add a Tag
- Then you set it as trigger in your WhatsApp Automation
- Use the Start Automation node
- And select your WhatsApp Automation
Choose one optionBoth ways will work.
But remember to collect the phone number in internation formar and save it as WhatsApp ID:

Hope this helps!