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n8n is a workflow automation platform that connects applications and automates business processes. This guide shows how to integrate DNCScrub APIs into n8n workflows for automated compliance checking.

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Prerequisites

  • n8n instance (cloud or self-hosted)
  • DNCScrub account with API access
  • Your DNCScrub API key (loginId)

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Setting Up Authentication

DNCScrub APIs authenticate via the loginId header.

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Create a Credential

  1. In n8n, go to Credentials → Add Credential
  2. Select Header Auth
  3. Configure:
    • Name: DNCScrub API
    • Header Name: loginId
    • Header Value: Your DNCScrub API key
n8n Header Auth credential setup

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Common Workflow Patterns

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Pre-Dial Compliance Check

Scrub phone numbers before dialing to ensure compliance using Salesforce trigger. n8x can work with multiple tools but this example uses Salesforce.
1

Add Trigger

Use a Salesforce Trigger for new leads, a Webhook for real-time requests, or a Schedule Trigger for batch processing.
2

Add HTTP Request Node

Configure the DNCScrub Scrub API call:
  • Method: GET
  • URL: https://www.dncscrub.com/app/main/rpc/scrub
  • Authentication: Select your DNCScrub API credential
  • Query Parameters:
    • phoneList: {{ $json.phone }}
    • projId: YOUR_PROJECT_ID (optional)
3

Add IF Node

Check the scrub result:
  • Condition: {{ $json.results[0].Status }} equals Ok
  • True branch: Proceed to dial
  • False branch: Skip or update CRM
4

Update CRM

Use the Salesforce Node to update the lead status based on scrub results.

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Add Contact to Internal DNC

Add to Internal DNC list. when requested by the contact. 
HTTP Request Configuration:
━━━━━━━━━━━━━━━━━━━━━━━━━━
Method: GET
URL: https://www.dncscrub.com/app/main/rpc/pdnc

Query Parameters:
  phoneList: {{ $json.phone }}
  action: add
  projId: YOUR_PROJECT_ID

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Workflow JSON

You can import this workflow directly into n8n: 
{
  "nodes": [
    {
      "name": "Salesforce Trigger",
      "type": "n8n-nodes-base.salesforceTrigger",
      "position": [250, 300]
    },
    {
      "name": "DNCScrub",
      "type": "n8n-nodes-base.httpRequest",
      "position": [450, 300],
      "parameters": {
        "method": "GET",
        "url": "https://www.dncscrub.com/app/main/rpc/scrub",
        "authentication": "genericCredentialType",
        "genericAuthType": "httpHeaderAuth",
        "queryParameters": {
          "parameters": [
            {
              "name": "phoneList",
              "value": "={{ $json.Phone }}"
            },
            {
              "name": "projId",
              "value": "YOUR_PROJECT_ID"
            }
          ]
        }
      }
    },
    {
      "name": "Check Result",
      "type": "n8n-nodes-base.if",
      "position": [650, 300],
      "parameters": {
        "conditions": {
          "string": [
            {
              "value1": "={{ $json.results[0].Status }}",
              "value2": "Ok"
            }
          ]
        }
      }
    }
  ]
}

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Error Handling

Add error handling to your workflows:
  1. Set “Continue On Fail” on HTTP Request nodes to handle API errors gracefully
  2. Add an IF node after each API call to check for success
  3. Log failures to a Google Sheet, database, or notification system

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Batch Processing Tips

When processing large lists:
  1. Use the Loop Over Items node to process records individually
  2. Add a Wait node (100-200ms) between requests to avoid rate limits
  3. Use POST endpoints for batches over 10 numbers

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