# E-commerce

Source: https://developer.avalara.com/merchandise-calculation-pt/projetando_transacoes/e-commerce/

Este é o processo de chamada de API no momento em que você entra na plataforma e a chamada de API durante o Checkout.

![A workflow diagram that shows the process customers, marketplaces, and AvaTax Brazil follow for calculating tax during an ecommerce sale](https://avalara-devdocs-prod.mcoutput.com/merchandise-calculation-pt/Resources/Images/DevDot/br-E-commerce_900x569.png)