A web service is developed that allows secure access to customer order status on the...

The web server flow is an OAuth2.0 authorization code grant type, which follows this sequence of steps:

The client app requests an authorization code from Salesforce by redirecting the user to the authorization endpoint.

The user authenticates and authorizes access to the client app.

Salesforce grants an authorization code and redirects the user back to the client app.

The client app requests an access token from Salesforce by sending the authorization code to the token endpoint.

Salesforce grants an access token and a refresh token tothe client app.