SMS Panel with API Integration

I’m building a platform focused on personalized marketing campaigns and need a complete SMS sender panel that also exposes a well-documented REST API. The core goal is to let me craft, schedule and track one-to-one promotional messages while keeping control of my own contact database... (Budget: $30 - $250 USD, Jobs: API Development, Bootstrap, JavaScript, MySQL, Node.js, PHP, RESTful, Web Development)