According to the quick start provided by the official website, download the World-Check One API Documentation 1.5 and use the REST client - Postman. According to the example, we imported the collection and environment json file, built the WC1 request, and filled in the api-key and api-secret. We did not get the correct groupsReturnRequest, but the status code of 401.Try changing the connection and security authorization caption-postman Environment variable, but still get a 401 return.