Broadcast campaign for customer Engagement via WhatsApp API

I'm in need of an expert in WhatsApp API management to help me in managing my WhatsApp broadcast campaign. The goal of this project is to boost customer engagement, primarily with promotional offers, targeted towards my existing customer base.

Key Requirements:
- Implementing a successful WhatsApp API broadcast campaign
- Crafting engaging promotional content
- Focusing on existing customers
- Monitoring campaign performance and making necessary tweaks

Ideal Skills and Experience:
- Proven track record in WhatsApp API usage and management
- Experience in customer engagement via promotional content
- Understanding of the gambling industry is a plus
- Ability to analyze campaign data and optimize