> ## Documentation Index
> Fetch the complete documentation index at: https://docs.slm.m1amdocs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Subscribe API Guide Preface

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

The Subscribe API leverages a Service Oriented Architecture (SOA), meaning that Subscribe users are not required to install application software on their network. Instead, use SOAP to communicate with the Subscribe application, either through a thin client provided by Vindicia, or through a WSDL published by the Vindicia SOAP servers (e.g. [http://soap.vindicia.com/1.0/Transaction.wsdl\\](http://soap.vindicia.com/1.0/Transaction.wsdl\\)). These SOAP servers comprise the first tier of Vindicia's network, and it is the only tier that is publicly accessible.

This manual, the **Subscribe API Guide**, lists and describes the Objects available in the Subscribe solution, and provides pseudo-code examples.

* **[Subscribe API Overview](../topics/Subscribe_API_Overview_1)**


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