Ecommerce technology partners and API developers can optionally forgo the AvaTax Developer Guide and instead use the Ecommerce Integration Guide. This self-serve guide provides the steps for you to follow in order to integrate Avalara AvaTax into your ecommerce system along with the order in which each milestone should be completed. Milestones are currently available to help technology partners achieve Sales Tax, Refunds, and Address Validation badges. And API developers can also follow these milestones to integrate these features into their platform.