Step 2. Calculate shipping rates externally

This is an external step – the logic here can vary from app to app and Ecwid doesn't have any way to interfere with this part.

Therefore, your application must do the following actions independently of Ecwid API:

• Collect the required data from the shipping request.

• Request shipping rates from the shipping provider's API.

• Receive and parse the response.

The app must return shipping rates to Ecwid within the 10-second window from receiving the initial POST request from the store. However, we recommend to complete this step in under 2 seconds.