To verify the output of a web service in salesforce we need to connect it with the postman. To connect salesforce with postman we need to follow these steps.
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Get access token:- To get access token.
- Click on the authorization tab in the request section.
- Select OAuth2.0 in type section
- Click on ‘Get New Access Token’.
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A window will popup.
- Write the information as mentioned above and click on the request token.
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On the next screen, you will get your token click on the Use token button.
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Select your request type
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Enter the URL – https:// — InstanceURL– /services/apexrest/
/ 
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In the body section put your request data.
