<PackageReference Include="Microsoft.Identity.Client" Version="4.83.1" />

Microsoft.Identity.Client.Internal.ClientCredential.SecretStringClientCredential

class SecretStringClientCredential : IClientCredential
public AssertionType AssertionType { get; }

public SecretStringClientCredential(string secret)

public Task<ClientCredentialApplicationResult> AddConfidentialClientParametersAsync(OAuth2Client oAuth2Client, AuthenticationRequestParameters requestParameters, ICryptographyManager cryptographyManager, string tokenEndpoint, CancellationToken cancellationToken)