Application mode in Dynamics 365 Retail Server

retail.cs

AuthenticationContext authenticationContext = new AuthenticationContext(azureActiveDirectory, false); 
AuthenticationResult authResult = null; 
authResult = await authenticationContext.AcquireTokenAsync(D365Url, new ClientCredential(clientId, clientSecret)); 
ClientCredentialsToken clientCredentialsToken = new ClientCredentialsToken(authResult.AccessToken); 
RetailServerContext retailServerContext = RetailServerContext.Create(retailServerUri, operatingUnitNumber, clientCredentialsToken); 
var factory = ManagerFactory.Create(retailServerContext);