Detailed Step-by-Step Guide: Postman to Salesforce API Integration

1. Set Up a Connected App in Salesforce

Purpose: Create an OAuth 2.0 app to authenticate Postman with Salesforce.

Steps:

1. Navigate to Setup → App Manager → New Connected App.

2. Fill in details:

   • Connected App Name: BlogPostAPI

   • API Name: BlogPostAPI (auto-filled)

   • Contact Email: [email protected]

3. Enable OAuth Settings:

   • Callback URL: https://oauth.pstmn.io/v1/callback (Postman’s OAuth callback)

   • Selected OAuth Scopes:

     • Access and manage your data (api)

     • Perform requests at any time (refresh_token)

   • Flow Enablement: Enable Client Credentials Flow

4. Save → Note down:

   • Consumer Key (3MVG9...)

   • Consumer Secret (ABC123...)

2. Get Access Token via Postman

Purpose: Obtain an OAuth token to authenticate API calls.

Request Setup in Postman:

• Method: POST

• URL:

  • Production: https://login.salesforce.com/services/oauth2/token

  • Sandbox: https://test.salesforce.com/services/oauth2/token

  • Dev Org: Goto Setup -> My Domain -> Current My Domain URL

• Headers:

  • Content-Type: application/x-www-form-urlencoded

• Body (x-www-form-urlencoded):

Save access_token and instance_url for later steps

3. Insert Blog Post via Salesforce REST API

Purpose: Send blog data from Postman to Salesforce.

Request Setup in Postman:

• Method: POST

• URL:{{instance_url}}/services/data/v58.0/sobjects/Blog_Post__c/

  (Replace {{instance_url}} with the one from Step 2)

• Headers:

  • Authorization: Bearer {{access_token}}

  • Content-Type: application/json

4. Retrieve Blog Posts (GET Request)

Purpose: Verify the data was stored correctly.

Request Setup in Postman:

• Method: GET

• URL:{{instance_url}}/services/data/v58.0/query?q=SELECT+Id,Title__c,Subtitle__c+FROM+Blog_Post__c

• Headers:

  • Authorization: Bearer {{access_token}}

5. Automate with Postman Collections & Environments

To avoid manually entering tokens:

1. Create a Postman Environment (Salesforce_Dev):

   • Variables:

     • access_token (from OAuth response)

     • instance_url (from OAuth response)

2. Use variables in requests:

   • {{access_token}} in headers

   • {{instance_url}} in URLs

Troubleshooting Common Issues