Sitecore Experience Commerce - Postman could not get any response

When testing out the Postman examples for the Sitecore Experience Commerce APIs, none of them would successfully run and I was getting the following error:

Could not get any response

Postman could not get a response

Opening up the Postman Console (View > Show Postman Console) revealed the following:

Error: SSL Error: UNABLE_TO_VERIFY_LEAF_SIGNATURE

Postman unable to verify leaf signature

To fix this error and allow Postman calls to the Sitecore Experience Commerce APIs to work as expected is as simple as turning off SSL certificate verification (because on a local environment these certificates are self signed).

Postman SSL certificate verification setting