WhatsApp and Email API Setup

I need a freelancer to set up WhatsApp and email APIs based on notes and data collected from an AI engine like chat cpt or Gemini. The work includes configuring the APIs, ensuring they can process incoming messages and send responses, and connecting them to the data source for accurate message handling. Experience with API integration and automation is important. Please share relevant examples of similar projects and your approach to testing and troubleshooting the setup.