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E-commerce ⇄ ERP

Easypost to Extensiv (3PL Central) integration — real-time, two-way sync

Keep Easypost and Extensiv (3PL Central) in sync without custom scripts. Cut weeks of integration work, eliminate silent data drift, and give your team a single, reliable source of truth.

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

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Why teams connect Easypost and Extensiv (3PL Central)

Keep the storefront in step with the back office: Easypost and Extensiv (3PL Central) share products, inventory, and orders in real time, in both directions.

Easypost runs the storefront and takes the orders; Extensiv (3PL Central) owns the item master, the stock on hand, and the finance behind every transaction. The two overlap wherever the same products, customers, and sales matter to both — and when re-keying or an overnight batch is what connects them, the store oversells items it can't ship, quotes prices finance never set, or leaves buyers waiting on status that already changed.

Stacksync syncs Parcel, Rate, Tracker, Batch in Easypost with Warehouses, Inventory adjustments, Customers, Items in Extensiv (3PL Central) field by field, in real time, and in both directions. You decide which system owns which fields — stock and pricing from Extensiv (3PL Central), order and customer detail from Easypost — and Stacksync keeps every copy consistent and resolves conflicts by rules you set.

Common use cases

  • 01 Sync CarrierAccount configuration and negotiated rates so shipping options stay consistent across the storefront, ERP, and 3PL systems.
  • 02 Pull Shipment, Rate, and Refund records into a warehouse to report shipping cost per carrier and service and reclaim postage on labels that were never scanned.
  • 03 Push receiving confirmations back to purchasing systems when inbound stock arrives.
  • 04 Consolidate order and shipment data across 3PL clients into a reporting database for billing and SLA tracking.

Common sync patterns

One product catalog

Where both systems keep item records, SKUs, descriptions, and attributes stay aligned so the store and the back office describe the same product.

Fulfillment and shipment status close the loop

As orders are picked, shipped, or invoiced in Extensiv (3PL Central), tracking and status flow back to Easypost so buyers see accurate updates.

One customer master

Where both systems keep customer records, a correction in either propagates to the other, ending dual maintenance.

What you can sync between Easypost and Extensiv (3PL Central)

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.

Easypost objects Extensiv (3PL Central) objects How this pairing syncs
Shipment The central writable object: create with a to/from Address and Parcel, receive Rate options, then buy a label to get postage_label and tracking_code; retrieve and list with cursor pagination. Shipments Carrier and tracking details synced back once orders ship. Same entity on both sides — records pair one-to-one and field-level changes reconcile in both directions.
CarrierAccount Carrier credentials and settings that control which carriers and negotiated rates are available; create, update, and delete to manage enabled carriers across accounts. Inventory On-hand and available quantities by warehouse, mirrored out to drive channel availability. CarrierAccount is specific to Easypost and Inventory to Extensiv (3PL Central) — each maps to any object or custom field on the other side.
Webhook Event subscriptions delivering an Event via HTTP POST on object changes; full CRUD (create, retrieve, list, update, delete) and the mechanism for near-real-time change delivery to Stacksync. Orders Outbound fulfillment orders pushed in from commerce or ERP systems. Webhook is specific to Easypost and Orders to Extensiv (3PL Central) — each maps to any object or custom field on the other side.
Address Origin and destination locations; create, retrieve, and list, plus address verification (delivery and residential) to normalize and validate addresses before they are saved downstream. Receivers Inbound receiving records (receipts/ASNs) that confirm stock arrival back to purchasing systems. Address is specific to Easypost and Receivers to Extensiv (3PL Central) — each maps to any object or custom field on the other side.
Parcel Package dimensions and weight (or a predefined_package); created standalone or inline on a Shipment and reused across shipments and batches. Warehouses Facility records that partition inventory and order routing. Parcel is specific to Easypost and Warehouses to Extensiv (3PL Central) — each maps to any object or custom field on the other side.
Rate Carrier service and price options EasyPost generates on a Shipment; read-only - you select a rate id and buy it, you do not create or edit rates directly. Inventory adjustments Manual stock corrections that reconciliation syncs need to capture. Rate is specific to Easypost and Inventory adjustments to Extensiv (3PL Central) — each maps to any object or custom field on the other side.

How changes propagate between Easypost and Extensiv (3PL Central)

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.

Easypost Extensiv (3PL Central) Sub-second propagation

DetectionEasypost notifies Stacksync of record changes through webhook events. Webhooks deliver an Event via HTTP POST on object changes (e.g.

DeliveryEach detected change is written to Extensiv (3PL Central) through its API, with automatic retries and rate-limit backoff.

Extensiv (3PL Central) Easypost Sub-second propagation

DetectionExtensiv (3PL Central) notifies Stacksync of record changes through webhook events. Webhook events for order, receipt, item, and inventory changes, with polling on modified-date filters as a fallback.

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

Rate-limit considerations

  • Easypost: Fixed 5 requests/second on index (list) endpoints plus a dynamic load-based limiter protecting buy and rate operations; exceeding either returns HTTP 429 Too Many Requests.
  • Extensiv (3PL Central): Subject to the platform's API rate limits; batch endpoints reduce call volume for order and inventory syncs.
What ships with Easypost ⇄ Extensiv (3PL Central)

Connect Easypost and Extensiv (3PL Central) for flexible, real-time data sync.

Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Easypost–Extensiv (3PL Central) connection.

Real-time

Two-way sync

Changes in Easypost or Extensiv (3PL Central) instantly reflect in both systems. No stale data, no manual imports.

No-code + pro-code

Workflow automation

Trigger automated workflows whenever Easypost or Extensiv (3PL Central) 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 Easypost or Extensiv (3PL Central) record.

Observability

Monitoring

Track your Easypost ⇄ Extensiv (3PL Central) sync health, view errors, and replay failed events in one click.

Trading partners

EDI

Transform legacy EDI complexity into simple database interactions between Easypost and Extensiv (3PL Central).

How the Easypost and Extensiv (3PL Central) connectors work

Easypost

Integration surface
REST API (EasyPost API v2, https://api.easypost.com/v2)
Authentication
HTTP Basic auth with the API key as the username and an empty password (Bearer token also accepted); separate Test and Production keys
Change detection
Webhooks deliver an Event via HTTP POST on object changes (e.g. tracker.updated); historical pulls via list/index endpoints using before_id/after_id cursor pagination
Capabilities
read · write · webhooks
Rate limits
Fixed 5 requests/second on index (list) endpoints plus a dynamic load-based limiter protecting buy and rate operations; exceeding either returns HTTP 429 Too Many Requests
Easypost setup guide

Extensiv (3PL Central)

Integration surface
REST API
Authentication
Short-lived access tokens obtained from integration client credentials (client ID and secret)
Change detection
Webhook events for order, receipt, item, and inventory changes, with polling on modified-date filters as a fallback
Capabilities
read · write · webhooks
Rate limits
Subject to the platform's API rate limits; batch endpoints reduce call volume for order and inventory syncs
How it works

How to connect Easypost to Extensiv (3PL Central) — 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 Easypost and Extensiv (3PL Central) 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
    Easypost connected
    Extensiv (3PL Central) connected
    OAuth 2.0
    SSH tunnel
    SSL certificate
    VPC peering
  2. 02

    Choose tables

    Pick the Easypost and Extensiv (3PL Central) 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 · Easypost ⇄ Extensiv (3PL Central)
    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
    Easypost Extensiv (3PL Central)
    Company company_name text
    Email email text
    Amount amount numeric
    Created created_at timestamp
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FAQ

Easypost and Extensiv (3PL Central) 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 363 integrations available for Easypost and Extensiv (3PL Central).

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