Integrate MessageBird SMS API

I need to integrate the MessageBird SMS API with my WordPress website for user notifications, specifically promotional messages. These messages will be sent out monthly.

Requirements:
- Set up MessageBird SMS API
- Integrate with WordPress for user notifications
- Configure system for monthly promotional messages

Ideal Skills:
- Experience with WordPress development
- Familiarity with MessageBird API
- Strong background in API integration
- Knowledge of SMS notification systems

Please provide a brief portfolio and estimated completion time.