curl -v --data '{ "operation": "GetUserId", "infoField1": "nobody@amazon.com", "infoField2": "nobody" }' -H "host:localhost" -H "content-type:application/json" -H "x-amz-date:20260809T111752Z" -H "authorization:DTA1-HMAC-SHA256 SignedHeaders=content-type;host;x-amz-date, Credential=367caa91-cde5-48f2-91fe-bb95f546e9f0/20260809, Signature=91dbfb738114dac9ecd4500564fc1df105c0577f27a277db498c0f01d26ee381" http://localhost:8000/service/linking