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Rest Web Service, 0) Create Remote site settings, Context: Third party is…

- - - - Web Server Flow
        
        Third party will use client id, client secret to get authorization code
        
        Third party will pass that authorization code to authenticate user by asking user to enter username password in a different page. To get Access token.
        
        Third party will access resources after getting access token
        
        I will give demo
      - Usermame Password Flow
        
        Third party will use client id, client secret, username, password to get directly get a access token
        
        Once third party gets access token, we can pass that access token to access salesforce resource
- - - - 3) Make a callout
        HttpResponse response = http.send(request);
        
        4) We need to deserialize the output
        1) Map<String, Object>)JSON.deserializeUntyped(response.getBody());
        2) wrapperclass wc = (wrapperclass)JSON.deserialize(response.getBody(), new wrapperclass());
        Use it like: wc.acc.name;
        WrapperClasse{
        account acc;
        contact con:
        }