# Avalara 1099 & W-9 — SDK | Avalara Developer

Source: https://developer.avalara.com/products/avalara-1099-and-w9/sdk/

## Start building

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.

## Unified SDK — Avalara 1099 & W-9

Open the A1099 v2 API section in the README for your language to install the package and call 1099 & W-9 endpoints:

[

C#

](https://github.com/avadev/Avalara-SDK-DotNet?tab=readme-ov-file#a1099-v2-api-documentation)[

Java

](https://github.com/avadev/Avalara-SDK-Java?tab=readme-ov-file#a1099-v2-api-documentation)[

TypeScript

](https://github.com/avadev/Avalara-SDK-Typescript?tab=readme-ov-file#a1099-v2-api-documentation)[

PHP

](https://github.com/avadev/Avalara-SDK-PHP?tab=readme-ov-file#a1099-v2-api-documentation)[

Ruby

](https://github.com/avadev/Avalara-SDK-Ruby?tab=readme-ov-file#a1099-v2-api-documentation)[

Python

](https://github.com/avadev/Avalara-SDK-Python?tab=readme-ov-file#a1099-v2-api-documentation)