Getting Started with Number Verification API

The Vonage Number Verification API is a mobile authentication method that verifies the phone number linked to the SIM card in the device connected to the mobile data network, providing secure possession factor for end-user authentication without interrupting the user experience. It's one of Vonage's Network APIs, which expose the network capabilities of mobile carriers to developers. The API offers silent authentication, reducing exposure to toll fraud and improving service security by simplifying user authentication. However, it has limitations such as requiring a data connection and limited coverage. To use the API, developers need a Vonage account, business and application profiles approved by CSPs, Node.js, and npm installed on their machine. The API requires implementing OAuth2 authorization code flow on the backend side to generate an access token for authentication. Once the access token is obtained, it can be used to call the Number Verification API, which responds with a boolean value indicating whether the phone number verification was successful or not.