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APIs work by sending requests for information from a web application or web server and receiving a response.
Using the Zip2Tax Sales Tax API, you can create a request and receive a real-time data response about sales and/or use tax for your e-commerce site and/or other information systems.
The Sales Tax API provides for XML or JSON responses with intuitive understandable structure.
It also provides for three levels of granularity: the 5-digit ZIP code level, the ZIP+4 level, or complete street address geolocating.