The Nexmo Messages API for Salesforce is a package that enables developers to send messages via SMS, MMS, WhatsApp Business, Facebook Messenger, and Viber Service Messages directly on the Salesforce Apex class, allowing for an omnichannel strategy. The package provides simplicity by accessing multiple channels through a single API, making it easy to integrate with various AI services such as IBM Watson or Google Dialogflow. With one-click installation, developers can easily embed the service into their application, whether server-side or client-side, within Salesforce or not. The package allows for creating multichannel messaging flows using Salesforce Process Builder, enabling triggers and actions based on specific conditions, making it easy to automate business logic.