https://help.tallysolutions.com/docs/td9rel54/auth_lib/introduction.htm

Tally Authentication Library

Tally Authentication Library enables partners to create applications that can run on mobiles and tablets, so that customers can connect to Tally.ERP 9 on the move. This library provides user authentication with the help of Tally.NET Server, the gateway to interact with Tally.ERP 9 application remotely. Apart from the host of services such as data synchronisation, remote data access, and SMS services that TSS (Tally Software Services) offers, partners can create mobile applications to interact with Tally.ERP 9 securely.

Tally Authentication Library support is available for the following platforms:

iOS (iPhones and iPads)

Android (Mobiles and tablets)

Windows 8.1 (Tablets and desktop Metro apps)

Windows Phone 8.1

BlackBerry 7

BlackBerry 10

Prerequisites

To develop mobile applications using Tally Authentication Library, the prerequisites are:

Valid TSS.

Server hosted by partner with whitelisted IP address and source name.

Note: To get the server whitelisted, partner needs to contact Tally Solutions Pvt. Ltd.