To verify we should create cart and check if tax value is present in cart. Additionally, we should check lambda logs via CloudWatch service to be sure that it’s the lambda was invoked and set taxRate
Choose Carts in Endpoint field, Create in Command field and put provided payload to Payload multiline field and click “GO!!!”
Key - unique value CustomerId - id of your user in commercetools
{
"key": "123",
"currency": "USD",
"customerId": "487cb8f0-0343-4195-b08d-d6cfe482577c",
"customerEmail": "karotkiv@gmail.com",
"lineItems": [
{
"sku": "Smartphone-1"
}
],
"taxMode":"External"
}



If you don’t remove extension at this step it will lead to wrong behavior during next steps