<PackageReference Include="System.ClientModel" Version="1.11.0" />

System.ClientModel.Primitives.CredentialKind

public enum CredentialKind
Specifies the kind of connection used by the client.
ApiKeyString = 1

Represents a connection using an API key as a string.

None = 0

Represents a connection using an out-of-band method.

TokenCredential = 2

Represents a connection using Token Credential.