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Business productivity ⇄ ERP

Klaviyo to Plex ERP integration — real-time, two-way sync

Keep Klaviyo and Plex ERP 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 Klaviyo and Plex ERP

Bridge the tools people work in and the system the business runs on: real-time, two-way sync between Klaviyo and Plex ERP.

The ERP holds the records the business is run on, and it is rarely where day-to-day work happens. Klaviyo is closer to the work, and the two often need the same facts about the same people, organizations, and transactions. Bridging them by hand, or by nightly file transfer, leaves each side out of date for hours at a time.

Stacksync syncs Flows, Templates, Catalog Items, Tags in Klaviyo with Production jobs, Sales orders, Purchase orders, Customers in Plex ERP bi-directionally and in real time, with field-level mapping and rules for which system wins on conflict. Changes made where the work happens reach the system of record within seconds, and the reverse.

Common use cases

  • Keep suppression and consent status consistent between Klaviyo and other email or SMS tools
  • Sync catalog items from an ERP or PIM so product recommendations and back-in-stock flows use current data
  • Keep customers, parts, and pricing aligned between Plex and the CRM the sales team uses.
  • Push sales orders captured in e-commerce or EDI systems into Plex for scheduling and fulfillment.

Where Klaviyo collects payments: transactions post through

Payment events sync into Plex ERP as they occur, keeping the enterprise records current without manual entry.

Where Plex ERP is the HR or people system of record

Worker and organization data from Plex ERP stays current in Klaviyo, so the tools people use daily reflect the org as it actually is.

Master data corrections travel

A customer, supplier, or contact detail corrected in either system updates the other, ending duplicate maintenance.

What you can sync between Klaviyo and Plex ERP

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.

Klaviyo objects Plex ERP objects
Catalog Items Product catalog records synced from an ERP or PIM power product blocks and back-in-stock triggers. Inventory On-hand balances and locations replicated for visibility outside the plant system
Tags Organizational labels on campaigns, flows, and lists support reporting rollups. Production jobs Shop-floor work records combining ERP and MES data for output reporting
Profiles Person records with arbitrary custom properties are the target for CRM and warehouse-sourced attributes. Sales orders Demand records written in from e-commerce or EDI channels and read out for fulfillment status
Lists Static audience memberships sync in from CRMs and forms for targeting. Purchase orders Procurement records mirrored to accounting and planning systems
Segments Dynamic audiences are readable so other tools can mirror who qualifies. Customers Account records kept consistent with the sales team's CRM
Events Timestamped behavioral records tied to metrics; external order and product events are pushed in to trigger flows. Suppliers Vendor records aligned with procurement and AP tools
What ships with Klaviyo ⇄ Plex ERP

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

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

Real-time

Two-way sync

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

No-code + pro-code

Workflow automation

Trigger automated workflows whenever Klaviyo or Plex ERP 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 Klaviyo or Plex ERP record.

Observability

Monitoring

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

Trading partners

EDI

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

How the Klaviyo and Plex ERP connectors work

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

Plex ERP

Integration surface
REST APIs plus legacy SOAP web services
Authentication
API keys issued through the Plex Developer Portal
Change detection
polling; no general-purpose change webhooks
Capabilities
read · write
Rate limits
subject to the platform's API rate limits
How it works

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

    Choose tables

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

Klaviyo and Plex ERP 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 Klaviyo and Plex ERP.

Popular · 8 of 386
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