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

TeleSign is a communications platform as a service (CPaaS) company, founded on security. Since 2005, TeleSign has been a trusted partner to the world’s leading websites and mobile applications, helping secure billions of end-user accounts. Today, TeleSign’s data-driven, cloud communications platform is changing the way businesses engage with customers and prevent fraud.

For more information about TeleSign, visit our website.


Code documentation is included in the SDK. Complete documentation, quick start guides and reference material for the TeleSign API is available within the TeleSign Enterprise Documentation.


To add the TeleSign Enterprise C# SDK to your project, build and install the TelesignEnterprise package:

$ nuget pack .\Path\To\csharp_telesign_enterprise\TelesignEnterprise\TelesignEnterprise.csproj
$ Install-Package .\Path\To\TelesignEnterprise-(insert latest version).nupkg

.NET framework v4.5.2+ is required for the TeleSign Enterprise C# SDK.


You will need a Customer ID and API Key in order to use TeleSign’s REST API. If you are already a customer and need an API Key, you can retrieve it from TelePortal.


We make use of popular, feature-rich and well-tested open-source libraries to perform the underlying functionality of the SDK. These dependencies are managed by the community accepted package manager. If you are unable to add these additional third party dependencies to your project we have ensured that the SDK code is easy to read and can serve as sample code. We have also made sure that more complicated functions such as GenerateTelesignHeaders can be easily extracted from the SDK and used 'as is' in your project.

C# Code Example: Verify SMS

Here is a basic code example with JSON response.

string customerId = "FFFFFFFF-EEEE-DDDD-1234-AB1234567890";
string apiKey = "EXAMPLETE8sTgg45yusumoN6BYsBVkh+yRJ5czgsnCehZaOYldPJdmFh6NeX8kunZ2zU1YWaUw/0wV6xfw==";

string phoneNumber = "phone_number";

VerifyClient verifyClient = new VerifyClient(customerId, apiKey);
RestClient.TelesignResponse telesignResponse = verifyClient.sms(phoneNumber);
{'errors': [],
 'reference_id': '25685A40218006049044A58789044948',
 'resource_uri': '/v1/verify/25685A40218006049044A58789044948',
 'status': {'code': 290,
    'description': 'Message in progress',
    'updated_on': '2017-02-07T03:13:42.610863Z'},
 'sub_resource': 'sms',
 'verify': {'code_entered': '',
    'code_state': 'UNKNOWN'}}

For more examples, see the examples project or visit the TeleSign Enterprise Documentation.