> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vindicia.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Vindicia Retain™ V1.5 API Guide Introduction

Vindicia Retain is an on-demand billing solution, available through an object-oriented application programming interface (API), based on the Simple Object Application Protocol (SOAP). The Vindicia Retain solution is accessed through a public API to the Vindicia Subscribe application, which is hosted and maintained on the Vindicia network.

**Note:** The Vindicia Retain API solution maintains the product's previous name **Select**.

The Vindicia Retain API leverages a Service Oriented Architecture (SOA), meaning that users are not required to install application software on their network. Instead, they use SOAP to communicate with the application, either through a thin client provided by Vindicia, or through a WSDL published by the Vindicia SOAP servers (See [WSDL methods](https://secure.vindicia.com/docs/soap/index.html?ver=1.5) ).

This guide lists and describes the objects available in the Vindicia Retain (Previously known as Select) solution, and provides code examples. It is written for technical readers, implementing the API.

* **[Vindicia Retain API Overview](../topics/Vindicia_Retain_API_Overview)**


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