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Telesign Full-service C# SDK

Telesign connects, protects, and defends the customer experience with intelligence from billions of digital interactions and mobile signals. Through developer-friendly APIs that deliver user verification, digital identity, and omnichannel communications, we help the world's largest brands secure onboarding, maintain account integrity, prevent fraud, and streamline omnichannel engagement.


  • .NET Framework v4.5.2+.
  • dotnet CLI (optional) - This tool isn't required to use this SDK, but it is required to use the installation instructions below.


These instructions are for MacOS. They will need to be adapted if you are installing on Windows.


Follow these steps to add this SDK as a dependency to your project.

  1. (Optional) Create a new directory for your C# project. Skip this step if you already have created a project. If you plan to create multiple C# projects that use Telesign, we recommend that you group them within a telesign_integrations directory.
    cd ~/code/local
    mkdir telesign_integrations
    cd telesign_integrations
    mkdir {your project name}
    cd {your project name}
  1. Create a new C# solution using the dotnet CLI in the top-level directory of your project.

    dotnet new console -o {name of the solution}

    For example:

    dotnet new console -o SendSMS

  2. Install the Telesign Full-service C# SDK using the dotnet CLI. This will also install the Telesign Self-service C# SDK since it is a dependency for the Full-service SDK.

    dotnet add package TelesignEnterprise --version 2.2.3

    Once the SDK is installed, you should see a message in the terminal notifying you that you have successfully installed the SDK.


There are alternate ways of installing this SDK. For examples, see this SDK's page in the NuGet gallery.


If you use a Telesign SDK to make your request, authentication is handled behind-the-scenes for you. All you need to provide is your Customer ID and API Key. The SDKs apply Digest authentication whenever they make a request to a Telesign service where it is supported. When Digest authentication is not supported, the SDKs apply Basic authentication.

What's next

  • Learn to send a request to Telesign with code with one of our tutorials.
  • Browse our Developer Portal for tutorials, how-to guides, reference content, and more.
  • Check out our sample code on GitHub.


The Telesign C# SDK lets you easily integrate with our REST API.







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