How to use the Passthrough API

Updated: October 21, 2026

November 25, 2024

This guide shows you how to make requests using Unified.to's Passthrough API with practical examples.

Before you begin

You should have:

At least one active connection for an integration
The connection ID for the integration you want to access

Making Passthrough requests

The following examples demonstrate calls to mock endpoints with the Passthrough API.

NOTE: There is only one reserved URL parameter, and that is __domain. Use it to override the default API URL for that integration.

Using the REST API directly

// GET request example
const response = await fetch('https://api.unified.to/passthrough/{connection_id}/v2/customers', {
  method: 'GET',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  }
});

// POST request example
const response = await fetch('https://api.unified.to/passthrough/{connection_id}/v2/customers', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    name: 'John Doe',
    email: 'john@example.com'
  })
});

Using the Unified.to SDK

// GET request
const response = await unified.passthrough.listPassthroughs({
  connectionId: 'YOUR_CONNECTION_ID',
  path: '/v2/customers'
});

// POST request
const response = await unified.passthrough.createPassthrough({
  connectionId: 'YOUR_CONNECTION_ID',
  path: '/v2/customers',
  data: {
    name: 'John Doe',
    email: 'john@example.com'
  }
});

// With custom headers
const response = await unified.passthrough.listPassthroughs(
  {
    connectionId: 'YOUR_CONNECTION_ID',
    path: '/v2/customers'
  },
  {
    fetchOptions: {
      headers: {
        'x-api-version': '2023-06-01'
      }
    }
  }
);

Real-world examples

Example 1: Fetching HubSpot properties

This example demonstrates how to fetch custom properties for HubSpot contacts.

const response = await unified.passthrough.listPassthroughs({
  connectionId: HUBSPOT_CONNECTION_ID,
  path: '/crm/v3/properties/{objectType}/batch/read'
});

// Response will contain raw HubSpot property definitions
console.log(response.data);

API reference: Hubspot CRM Properties

Example 2: Creating a Slack channel

This example demonstrates creating a channel in Slack.

// Create a private Slack channel
const response = await unified.passthrough.createPassthrough({
  connectionId: SLACK_CONNECTION_ID,
  path: '/conversations.create',
  data: {
    name: 'project-discussion',
    is_private: true
  }
});

// Check the response
if (response.data.ok) {
  console.log('Channel created:', response.data.channel.id);
}

API reference: conversations.create

Example 3: Creating a Salesforce record

This example demonstrates two ways of creating a new Account record in Salesforce using their sObject API.

// Using the SDK
const response = await unified.passthrough.createPassthrough({
  connectionId: SALESFORCE_CONNECTION_ID,
// Note: path starts with 'services/data/v62.0' as required by Salesforce
  path: 'services/data/v62.0/sobjects/Account/',
  data: {
    "Name": "Express Logistics and Transport"
  }
});


const response = await fetch('https://api.unified.to/passthrough/{connection_id}/services/data/v62.0/sobjects/Account/', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_UNIFIED_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    "Name": "Express Logistics and Transport"
  })
});

// The response will contain the new record ID if successful:
// {
//   "id": "001D000000IqhSLIAZ",
//   "errors": [],
//   "success": true
// }

API reference: Create a Record

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