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Business productivity ⇄ CRM

Customer.io to Folk CRM integration — real-time, two-way sync

Keep Customer.io and Folk CRM in sync without custom scripts. Cut weeks of integration work, eliminate silent data drift, and give your team a single, reliable source of truth.

  • SOC 2 and 6 other compliance frameworks
  • POC with real engineers in minutes

Adopted by fast-scaling companies moving mission-critical data in real time

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Why teams connect Customer.io and Folk CRM

Sync what happens in Customer.io with the customer records in Folk CRM, in real time and in both directions.

The CRM is supposed to be the record of every customer relationship, but customer-relevant information also accumulates in the other tools a team runs. Whatever Customer.io holds or produces that touches a customer, whether conversations, payments, replies, enriched data, or notes, the CRM only benefits if it arrives without someone copying it over.

Stacksync connects Campaigns, Broadcasts, Deliveries / Messages, Newsletters in Customer.io to Notes, Reminders, People, Companies in Folk CRM with bi-directional, real-time sync. Activity and record changes in Customer.io update the matching contact or account in Folk CRM, and CRM data flows the other way wherever Customer.io can store and use it.

Common use cases

  • Keep unsubscribe and subscription-preference state consistent between Customer.io and the CRM to avoid compliance gaps.
  • Sync account-level objects and their person relationships for B2B messaging keyed to company attributes.
  • Push enriched contact data from a data warehouse into folk custom fields.
  • Mirror folk groups into a reporting database to track pipeline and outreach coverage.

Where Customer.io supplies contact or company data

Enriched fields land directly on records in Folk CRM, and refreshes keep them from going stale.

Where Customer.io processes payments

Charges, refunds, and subscription changes appear on the account in Folk CRM, so revenue context lives with the relationship.

Where Customer.io can store CRM context: fields kept current

Owner, lifecycle stage, or account details from Folk CRM sync into Customer.io, so people working there have the context without switching tools.

What you can sync between Customer.io and Folk CRM

Representative objects on each side — any object or custom field can map to any target. Schemas are auto-detected; types are converted between the two systems.

Customer.io objects Folk CRM objects
Broadcasts One-off sends to segments or audiences, triggerable via API. People Contact records; the primary entity synced with outreach and enrichment tools.
Deliveries / Messages Per-recipient message records whose lifecycle events flow out through reporting webhooks. Companies Organization records linked to people and kept aligned with billing or CS systems.
Newsletters Recurring email sends with performance metrics available for reporting syncs. Groups Shared workspaces that organize contacts; group membership is often the field integrations act on.
People Profiles with attributes, matched on identifiers like id or email; the main write target of data syncs. Custom fields Group-scoped attributes that receive enriched or computed values from external systems.
Objects Non-person entities such as accounts or companies, related to people for account-level messaging. Notes Free-text context attached to people and companies, readable for reporting.
Events Behavioral events sent via the Track API that trigger campaigns. Reminders Follow-up items that can be created from external triggers.
What ships with Customer.io ⇄ Folk CRM

Connect Customer.io and Folk CRM for flexible, real-time data sync.

Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Customer.io–Folk CRM connection.

Real-time

Two-way sync

Changes in Customer.io or Folk CRM instantly reflect in both systems. No stale data, no manual imports.

No-code + pro-code

Workflow automation

Trigger automated workflows whenever Customer.io or Folk CRM data changes, update records, fire webhooks, or kick off sequences without brittle API scripts.

At scale

Event queues

Handle millions of events per minute without losing a single Customer.io or Folk CRM record.

Observability

Monitoring

Track your Customer.io ⇄ Folk CRM sync health, view errors, and replay failed events in one click.

Trading partners

EDI

Transform legacy EDI complexity into simple database interactions between Customer.io and Folk CRM.

How the Customer.io and Folk CRM connectors work

Customer.io

Integration surface
REST APIs split by purpose: Track API for data ingestion, App API for campaigns, people lookups, and messages
Authentication
Basic auth with site ID and API key for the Track API; bearer token for the App API
Change detection
Reporting webhooks push message and delivery events; person attribute changes are not streamed and require source-side detection
Capabilities
read · write · webhooks
Rate limits
Subject to per-API rate limits documented by Customer.io

Folk CRM

Integration surface
REST API
Authentication
API key (Bearer token)
Change detection
Webhook subscriptions for record events, with polling of list endpoints as a fallback
Capabilities
read · write · webhooks
Rate limits
Subject to the platform's API rate limits
How it works

How to connect Customer.io to Folk CRM — three steps, no code

Configure and sync within minutes, no code. Whether you sync 50k or 100M+ records, Stacksync handles the queues, infra, and plumbing. Integrations are non-invasive and need zero setup on your systems.

  1. 01

    Connect your apps

    Authenticate Customer.io and Folk CRM with each platform's native method — OAuth, API keys, or service accounts — plus secure options like SSH tunneling, IP whitelisting, and VPC peering.

    • OAuth 2.0
    • SSH tunnel
    • VPC peering
    Customer.io connected
    Folk CRM connected
    OAuth 2.0
    SSH tunnel
    SSL certificate
    VPC peering
  2. 02

    Choose tables

    Pick the Customer.io and Folk CRM objects to sync — Stacksync auto-detects both schemas, including custom fields where the platform exposes them. Sync to existing tables, or let Stacksync create new ones with ideal data types.

    • Standard objects
    • Custom objects
    • Auto-schema
    objects · Customer.io ⇄ Folk CRM
    Customers 12,480
    Sales Orders 8,213
    Invoices 5,902
    Items 1,344
  3. 03

    Map fields

    Fields map automatically even when names and types differ. Stacksync handles transformation and type casting for you, zero configuration required.

    • Auto-map
    • Type casting
    • Transforms
    Customer.io Folk CRM
    Company company_name text
    Email email text
    Amount amount numeric
    Created created_at timestamp
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FAQ

Customer.io and Folk CRM integration FAQ

SECURITY

Security teams love Stacksync

As a data company, we understand the importance of keeping your data secure. Stacksync is built with security best practices to keep your data safe at every layer, and is DPF-certified for US, EU, UK and CH data transfers.

Learn more about security
SOC 2 type II
ISO 27001
HIPAA BAA
GDPR
CCPA
CSA STAR
DPF US-EU-UK-CH
→ SECURITY WITH BENEFITS

SSO & SCIM

Let your users access Stacksync from your centralized user management systems. Works with Okta, Azure, Google SSO and more.

Alerts

Immediately get alerted about record syncing issues over email, Slack, PagerDuty and WhatsApp. Resolve issues from a centralized dashboard with retry and revert options.

Secure connection options

Securely connects to your systems with:

OAuth 2 SSH Tunnelling SSL certificates IP Whitelisting VPN gateway VPC peering and more

Related integrations

Every pair below is a real-time, two-way sync. Search all 386 integrations available for Customer.io and Folk CRM.

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