WhatsApp Customer Support Script

I need a script to send messages on customers WhatsApp. The messages should be triggered based on specific conditions. No third party APi only whatsapp API or facebook is accepted . Please as demo before start discussion

Requirements:
- Ability to send personalized messages
- Trigger messages based on predefined conditions

Ideal Skills and Experience:
- Experience with WhatsApp API
- Proficiency in scripting and automation
- Familiarity with setting up conditional triggers