The Avalara Unified SDK provides generated clients for multiple Avalara REST APIs in a single package. Use it to integrate Avalara 1099 & W-9 (A1099 v2) alongside other supported services in your preferred language.
These libraries are open source. Report issues or ask questions using the GitHub repository for your language.
Open the A1099 v2 API section in the README for your language to install the package and call 1099 & W-9 endpoints: