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AvaTax APIs
AvaTax Calc includes a robust API designed to integrate with virtually any application.

Ecommerce Shopping Cart? Point of Sale? ERP Application?
Our REST API is simple, and powerful enough for most integrations. We also have a software development kit (SDK), available for AvaTax allows you to easily integrate our sales tax solutions with almost any financial, ecommerce, point-of-sale, custom-built or third-party application using our SOAP API.
Plug it in with our SDK.
PHP, .NET, Java, or a COM-compliant language, we've got you covered. With full testing and support as well as optional time-saving adapters, Avalara's Sales Tax SDK takes the AvaTax services API, surrounds it with documentation and sample code, and makes it available to developer partners. The SDK will make short, efficient work of your integration:
- Detailed, MSDN-style documentation.
- Complete, functioning sample code.
- An optional, time-saving adapter for developers working in a .NET, Java, or COM-compliant language.
Visit our Free Trial Registration to learn more and get started.