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First you need to get bearer token:

IConfidentialClientApplication app = ConfidentialClientApplicationBuilder.Create({ClientId}).WithTenantId({TenantId}).WithClientSecret({ClientSecret}).Build();
var token = await app.AcquireTokenForClient(new string[] {“ClientId/.default"}).ExecuteAsync();

Where ClientId is ClientId of application which is trying to access DS API and ClientSecret you can get in application Azure registration.

Or you can use DS ClientId and ClientSecret instead, which we can provide for you.

Then we need to add this token to HttpClient header:

HttpClient _client;
_client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);

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