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CRM ⇄ Business productivity

Affinity to Klaviyo integration — real-time, two-way sync

Keep Affinity and Klaviyo 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 Affinity and Klaviyo

Sync what happens in Klaviyo with the customer records in Affinity, 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 Klaviyo 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, Flows, Templates, Catalog Items in Klaviyo to Lists, List Entries, Persons, Organizations in Affinity with bi-directional, real-time sync. Activity and record changes in Klaviyo update the matching contact or account in Affinity, and CRM data flows the other way wherever Klaviyo can store and use it.

Common use cases

  • 01 Mirror campaign and flow engagement events into a warehouse for revenue attribution alongside order data
  • 02 Keep suppression and consent status consistent between Klaviyo and other email or SMS tools
  • 03 Keep introductions and relationship data from Affinity aligned with outreach tools used by the team.
  • 04 Sync notes and reminders into project or task systems used outside the deal team.

Common sync patterns

Where Klaviyo processes payments

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

Where Klaviyo can store CRM context: fields kept current

Owner, lifecycle stage, or account details from Affinity sync into Klaviyo, so people working there have the context without switching tools.

Where Klaviyo runs outreach

Prospects, sends, and replies sync into Affinity, keeping lead status current without manual imports.

What you can sync between Affinity and Klaviyo

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.

Affinity objects Klaviyo objects How this pairing syncs
Lists Pipelines (deal flow, fundraising, portfolio) that structure most Affinity data; syncs usually target a specific list. Lists Static audience memberships sync in from CRMs and forms for targeting. Same entity on both sides — records pair one-to-one and field-level changes reconcile in both directions.
Persons Contact records enriched with relationship intelligence, synced with CRMs and outreach tools. Flows Automation definitions and their engagement data sync outward for attribution. Persons is specific to Affinity and Flows to Klaviyo — each maps to any object or custom field on the other side.
Organizations Company records matched to accounts in other systems by domain. Templates Message templates are accessible via API for content management workflows. Organizations is specific to Affinity and Templates to Klaviyo — each maps to any object or custom field on the other side.
Opportunities Deal records tracked on lists and synced with pipeline reporting. Catalog Items Product catalog records synced from an ERP or PIM power product blocks and back-in-stock triggers. Opportunities is specific to Affinity and Catalog Items to Klaviyo — each maps to any object or custom field on the other side.
Field Values Custom field data, either global or scoped to a list, mapped field-by-field in syncs. Tags Organizational labels on campaigns, flows, and lists support reporting rollups. Field Values is specific to Affinity and Tags to Klaviyo — each maps to any object or custom field on the other side.
Notes Meeting and call notes synced for record-keeping in other systems. Profiles Person records with arbitrary custom properties are the target for CRM and warehouse-sourced attributes. Notes is specific to Affinity and Profiles to Klaviyo — each maps to any object or custom field on the other side.

How changes propagate between Affinity and Klaviyo

Each direction of the sync is driven by what the source system can signal and what the destination accepts — detection, delivery, and expected latency below.

Affinity Klaviyo Sub-second propagation

DetectionAffinity notifies Stacksync of record changes through webhook events. Webhook subscriptions for record events, supplemented by polling.

DeliveryEach detected change is written to Klaviyo through its API, with automatic retries and rate-limit backoff.

Klaviyo Affinity Sub-second propagation

DetectionKlaviyo notifies Stacksync of record changes through webhook events. Polling on updated timestamps.

DeliveryEach detected change is written to Affinity through its API, with automatic retries and rate-limit backoff.

Rate-limit considerations

  • Affinity: Subject to the platform's published API rate limits.
  • Klaviyo: Per-endpoint burst and steady rate limits apply.
What ships with Affinity ⇄ Klaviyo

Connect Affinity and Klaviyo for flexible, real-time data sync.

Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Affinity–Klaviyo connection.

Real-time

Two-way sync

Changes in Affinity or Klaviyo instantly reflect in both systems. No stale data, no manual imports.

No-code + pro-code

Workflow automation

Trigger automated workflows whenever Affinity or Klaviyo 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 Affinity or Klaviyo record.

Observability

Monitoring

Track your Affinity ⇄ Klaviyo sync health, view errors, and replay failed events in one click.

Trading partners

EDI

Transform legacy EDI complexity into simple database interactions between Affinity and Klaviyo.

How the Affinity and Klaviyo connectors work

Affinity

Integration surface
REST API
Authentication
API key
Change detection
Webhook subscriptions for record events, supplemented by polling
Capabilities
read · write · webhooks
Rate limits
Subject to the platform's published API rate limits

Klaviyo

Integration surface
REST API compliant with the JSON:API specification
Authentication
OAuth 2.0 for apps or private API keys
Change detection
Polling on updated timestamps; outbound webhooks exist for event topics (availability depends on plan or app-partner status) and as flow webhook actions
Capabilities
read · write · webhooks
Rate limits
Per-endpoint burst and steady rate limits apply
How it works

How to connect Affinity to Klaviyo — 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 Affinity and Klaviyo 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
    Affinity connected
    Klaviyo connected
    OAuth 2.0
    SSH tunnel
    SSL certificate
    VPC peering
  2. 02

    Choose tables

    Pick the Affinity and Klaviyo 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 · Affinity ⇄ Klaviyo
    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
    Affinity Klaviyo
    Company company_name text
    Email email text
    Amount amount numeric
    Created created_at timestamp
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FAQ

Affinity and Klaviyo integration FAQ

SECURITY

Security teams trust 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
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 507 integrations available for Affinity and Klaviyo.

Popular · 8 of 507
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