type AzureKMSOptions = AzureKMSCredentials | AzureAccessToken;

interface AzureKMSCredentials {
   tenantId: string;
   clientId: string;
   clientSecret: string;
   identityPlatformEndpoint?: string; // Defaults to login.microsoftonline.com
};

interface AzureAccessToken {
   accessToken: string;
};

type GCPKMSOptions = GCPKMSCredentials | GCPKMSAccessToken

interface GCPKMSCredentials {
   email: string;
   privateKey: byte[] | string; // May be passed as a base64 encoded string.
   endpoint?: string; // Defaults to oauth2.googleapis.com
};

interface GCPKMSAccessToken {
   accessToken: string;
}