SaaS Pro - SOAP API Last updated Save as PDF Welcome to the AvaTax for Communications Pro - SOAP API FAQ. Find answers to the questions other people are asking. Type something into the search bar if you can't find what you're looking for.How do I map my items to the service and billing codes (T/S pairs)?How do I test a SOAP transaction?Where can I find information about the SOAP API requirements?Most popularHow do I test a SOAP transaction?Where can I find information about the SOAP API requirements?How do I map my items to the service and billing codes (T/S pairs)?Shortcuts News Flash Release Notes - All Products