Intercom Migration Deep Dive

Overview

Comprehensive guide for migrating to Intercom from other platforms (Zendesk, Freshdesk, HelpScout) or bulk-importing data. Covers contact import, company import, tags, Help Center articles, orchestration, and post-migration validation. The full runnable TypeScript for every phase lives in references/implementation.md; this file carries the workflow and the first-phase skeleton so you can follow it end to end, then drill into the reference for depth.

Prerequisites

• Intercom workspace with an access token exported as INTERCOM_ACCESS_TOKEN
• Source system data exported (CSV or API access)
• The intercom-client SDK installed (npm install intercom-client)
• Feature flag infrastructure for gradual cutover
• Rollback strategy tested

Authentication

All scripts read the workspace access token from the environment — never hard-code it. Create the token in the Intercom Developer Hub (Settings → Developers → your app → Authentication), then:

export INTERCOM_ACCESS_TOKEN="your-workspace-access-token"

import { IntercomClient, IntercomError } from "intercom-client";
const client = new IntercomClient({ token: process.env.INTERCOM_ACCESS_TOKEN! });

Migration Types

Type	Complexity	Duration	Risk
Contact import	Low	Hours	Low
Zendesk/Freshdesk migration	Medium	1-2 weeks	Medium
Full re-platform (with history)	High	2-4 weeks	High
Help Center migration	Medium	Days	Low

Instructions

Run the phases in dependency order. Each phase is a standalone function in references/implementation.md; the orchestrator in Step 5 chains them.

1. Contacts (Step 1) — idempotent: search by external_id/email, then update or create. Stamp migrated_from + migration_date custom attributes so rollback can find migrated records. Skeleton below.
2. Companies (Step 2) — import before attaching contacts; contacts reference companies.
3. Tags (Step 3) — create each tag, apply to its contacts, skip missing (404) contacts instead of aborting.
4. Articles (Step 4) — group into Help Center collections by category, creating each collection once.
5. Orchestrate (Step 5) — executeMigration(plan) runs companies → contacts → tags → articles with per-phase progress logging.
6. Validate (Step 6) — validateMigration(expectedCounts) compares live counts against source counts (95% threshold for contacts/articles).

Contact-import skeleton (full body in the reference):

async function importContacts(contacts: SourceContact[]) {
  const stats = { created: 0, updated: 0, failed: 0, errors: [] as any[] };
  for (const contact of contacts) {
    const existing = await client.contacts.search({
      query: { operator: "OR", value: [
        { field: "external_id", operator: "=", value: contact.id },
        { field: "email", operator: "=", value: contact.email },
      ] },
    });
    if (existing.data.length > 0) {
      await client.contacts.update({ contactId: existing.data[0].id, /* ...attrs */ });
      stats.updated++;
    } else {
      await client.contacts.create({ role: "user", externalId: contact.id, /* ...attrs */ });
      stats.created++;
    }
  }
  return stats;
}

See references/implementation.md for the complete error handling, rate limiting, company/tag/article functions, orchestrator, and validation code.

Output

• Contact import returns { created, updated, failed, errors[] } — a reconciliation record where errors[] carries per-contact { contact_id, email, error } for every failure.
• Orchestrator (executeMigration) prints a per-phase progress log and a final Migration complete in N minutes line plus the first 10 failed contacts.
• Validation (validateMigration) returns { passed, checks[] } where each check is { name, expected, actual, passed }, and prints a PASSED/FAILED summary with an OK/FAIL line per resource.

Error Handling

Issue	Cause	Solution
409 Conflict	Duplicate external_id/email	Search before create
429 Rate Limited	Too fast	Add delays between batches
422 Validation	Bad email/data format	Validate data before import
Partial migration	Script crashed	Use idempotent operations, re-run
Missing conversations	API doesn't support bulk import	Contact Intercom support for import

Rollback: keep the source system active during migration; only decommission after validation plus a 2-week parallel run. To reverse, search by custom_attributes.migration_date and delete migrated contacts in batches — see the Rollback Procedure in references/implementation.md.

Examples

• Bulk contact import from Zendesk — export contacts to SourceContact[], run importContacts() (Step 1), then reconcile against the returned errors[]. Full function: references/implementation.md.
• Full re-platform with history — build a MigrationPlan (contacts, companies, tags, articles) and run executeMigration(plan) (Step 5), then validateMigration(expectedCounts) (Step 6). Full orchestrator + validation: references/implementation.md.
• Help Center article migration — map categories to collections and run migrateArticles(articles, authorId) (Step 4): references/implementation.md.

Resources

• Full implementation walkthrough — all six phases, rollback, and validation in runnable TypeScript
• Contacts API
• Companies API
• Articles API
• Import Contacts Guide
• Tags API