C# code post create-a-case returns 401 unauthorized

The request using the code is in the question.

Here is the request using Postman

Request Headers

Date: Mon, 12 Jul 2021 13:11:34 GMTContent-Type: application/jsonAuthorization: Signature keyId="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",algorithm="hmac-sha256",headers="(request-target) host date content-type content-length",signature="8WaJl5RGH88c7zJJ7Ls5/1mexev6K35MurIZnI0sEKo="Content-Length: 171User-Agent: PostmanRuntime/7.28.1Accept: */*Cache-Control: no-cachePostman-Token: 92636f9a-73f8-4d51-b8c0-a0fee5ea9d53Host: api-worldcheck.refinitiv.comAccept-Encoding: gzip, deflate, brConnection: keep-alive

Request Body

{ "entityType": "ORGANISATION", "groupId": "xxxxxxxxxxxxxxxxxxxxxxxxx", "providerTypes": [ "WATCHLIST" ], "name": "Lajnat ul Masa Eidatul Afghaniab" }

No, the format is not changed. They are both from WorldCheck sample code. The have changedthe name and added this code "ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;" from answer in other question to solve the problem with the error "Could not create secured channel". I have tried with different names.

I noticed there is a space between post and gatewayurl that I removed somehow( must be when I tried different things to solve this problem) in the dataToSign variable. I added back in. This is now the same as the sample code (below)

UTF8Encoding encoding = new UTF8Encoding();

byte[] byte1 = encoding.GetBytes(postData);

string msg = postData;

string dataToSign = "(request-target): post " + gatewayurl + "cases\n" +

"host: " + gatewayhost + "\n" + // no https only the host name

"date: " + date + "\n" + // GMT date as a string

"content-type: " + "application/json" + "\n" +

"content-length: " + byte1.Length + "\n" +

msg;

I now get a different error. With the space back in I now get error 500 Internal Server Error.

This is the dataToSign value: "(request-target): post /v2/cases\nhost: api-worldcheck.refinitiv.com\ndate: Tue, 13 Jul 2021 20:54:17 GMT\ncontent-type: application/json\ncontent-length: 138\n{\"entityType\":\"ORGANISATION\",\"groupId\":\"xxxxxxxxxxxxxxxxxxxxxxx\",\"provideTypes\":[\"WATCHLIST\"],\"name\":\"Lajnat ul Masa Eidatul Afghaniab\"}"

I see the postman body has new line and indented so I removed them all. The content length from postman is now show 139, it is 1 longer than the content length from C# code. I can't find where that 1 different in length is. Is it really the cause of the issue?

Request HeadersDate: Tue, 13 Jul 2021 20:51:43 GMTContent-Type: application/jsonAuthorization: Signature keyId="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",algorithm="hmac-sha256",headers="(request-target) host date content-type content-length",signature="e/Sxhitb/KbbSdt3Qqml0KsPbIGMLR0XwzWT6eCm5Cs="Content-Length: 139User-Agent: PostmanRuntime/7.28.1Accept: */*Cache-Control: no-cachePostman-Token: 4a30df6a-6450-400c-afa7-65210b4a92eaHost: api-worldcheck.refinitiv.comAccept-Encoding: gzip, deflate, brConnection: keep-alive