Hey there @Mariale_Padilla and welcome to the Community.
Are the WhatsApp channels integrated into a Conversations Inbox in HubSpot? If they are, then you should be able to create a Conversations-based workflow based on channel, which in theory is only started when a WhatsApp message comes in as new. That’s where I’d start if it were me.
- Set each WhatsApp number as its own conversations inbox
- Customer Service
- Techincal Support
- Build a Conversations-based workflow
- Base it on a new conversaiton in the specific inbox
- Each welcome message can be customized & assigned
Hopefully that helps!