Salesforce - Postman connection (integration)

Salesforce - Postman

In order to connect Salesforce and Postman, all you need are three things :

1. Install Postman or sign-in to postman

2. Create an connected app in Salesforce

3. Apex class exposed to Postman for accessing data from Salesforce

Apex Class : (simple class to return a "String")

@RestResource(urlMapping='/getStrings/*')
global class postmanConnectorService {
    @HttpGet
    global static String stringFetch(){
            return 'I am a string and i am being fetched from Salesforce Organization';
    }

} 

Creating an connected app in Salesforce : (Steps to follow)

After installing or sign-in to Postman : (follow the below steps)

Prepare ur url in the below format, replace all the yellow with the required inputs

URL 1 : https://test.salesforce.com/services/oauth2/token?grant_type=password&client_id=ConsumerKey&client_secret=ConsumerSecret&username=UserName&password=Password&redirect_uri=https://login.salesforce.com/services/oauth2/success

URL 1, is used for fetching the access token, this is necessary to connect with Salesforce to prove that you are an authenticated external system trying to access . 

Use POST method to get the access token, use the same access token to GET the string from exposed apex class.

If at all you get 401 - invalid header, it means that you do not have access to Salesforce.

If at all you get 400 - invalid_grant, it means that you do not have provided proper Urls or credentials are wrong to Salesforce.