Integrating Two ServiceNow PDIs Using REST API: A Step-by-Step Guide

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Step 1: Prepare Your PDIs

• Ensure both PDIs are active and accessible.
• Note down:
  • Instance URLs
  • Admin credentials
  • Target table (e.g., incident)

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Step 2: Create an API User on Target PDI

• Navigate to User Administration > Users
• Create a user (e.g., api_user)
• Assign the web_service_admin or rest_service role

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Step 3: Configure Basic Authentication

• Go to System Web Services > Outbound > REST Message
• Create a Basic Auth Profile using the target PDI credentials

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Step 4: Create REST Message in Source PDI

• Navigate to System Web Services > Outbound > REST Message
• Create a new REST Message:
  • Endpoint URL: https://<target_instance>.service-now.com/api/now/table/incident
  • Add HTTP Method: POST or GET

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Step 5: Attach Authentication Profile

• Link the Basic Auth Profile to your REST Message
• Ensure headers like Content-Type: application/json are added

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Step 6: Test the Integration

• Use the Preview Script to send a sample request
• Verify the record creation or retrieval in the target PDI

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Step 7: Automate with Flow Designer (Optional)

• Use Flow Designer to trigger REST Message on events like:
  • New incident creation
  • Record updates