API - Application Programming Interface is a set of protocols and tools for building a software applications.
Unifonic REST, SMPP and Email to SMS APIs allow you to connect your apps directly to networks, where you can integrate your apps to send text messages, and make voice calls around the world. You can also inquire meta-data about your account, text messages, and usage.
Select your application type, and fill in the required data.
After creating your app, you will get your app identifier as below