The MessageMedia PHP SDK by MessageMedia can access the API to integrate text messages into business applications. Installation is available via composer also accessible on GitHub.
Twilio has released a beta version of its Conversations API. The unified API allows developers to aggregate messages across channels (SMS, MMS, Chat, and WhatsApp) into a single conversation. Additionally, administrators can control the conversation and supplement with experiential features.
CloudRail has released a new Unified Messaging API for deploying chatbots and other conversational user interfaces (UI). The API provides a unified interface bundling Facebook Messenger, Line, Telegram, and Viber together so that developers can deploy chatbots across these platforms.