Shopify Shipping Integration Services

We build custom Shopify apps that connect your store to carriers, aggregators and back-office systems: carrier-calculated rates at checkout, fulfillment through the FulfillmentOrder APIs, labels and tracking sync, and connections to your WMS or ERP such as SYSPRO, Epicor Prophet 21 or NetSuite. We can also build the complete multi-carrier shipping platform behind it.

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CarrierService Rates
Fulfillment Orders
Labels
Tracking Sync
Delivery Customization
ERP + WMS Sync

What We Build

Carrier-Calculated Rates

A carrier service registered through the Admin API receives the cart origin, destination and items at checkout, and our endpoint returns live rates from your carriers, aggregator or own rate logic.

Fulfillment Orders

Work with Shopify fulfillment orders to pick up what needs shipping per location, create fulfillments with tracking details, and handle holds, splits and partial shipments correctly.

Label Creation

Create labels through carrier APIs or an aggregator such as EasyPost when an order is ready to ship, and print them at the packing station.

Tracking Sync

Write tracking numbers and carrier names back to the fulfillment so Shopify shipping notifications and the order status page show them, and keep statuses updated as the parcel moves.

Delivery Customization

Use Shopify Functions to hide, rename or reorder delivery options at checkout based on cart contents, customer or destination.

ERP and WMS Sync

Push Shopify orders to SYSPRO, Epicor Prophet 21, NetSuite or your WMS, and bring fulfillments, tracking and inventory back into Shopify.

How We Build Your Integration

Discovery

We review your Shopify plan and setup, locations, carriers and fulfilment workflow, and confirm the store can use carrier-calculated rates.

Architecture

We design the app on the GraphQL Admin API: carrier service, fulfillment order handling, webhooks and the connections to carriers and back-office systems.

Development

We build the app with OAuth installation, verified webhooks, a fast rate endpoint and the carrier or ERP connectors.

Testing

We test on a development store: checkout rates across addresses and carts, fallback behaviour, split and partial fulfilments, and tracking sync.

Launch and Support

We install on your store with monitoring on rate response times and errors, and keep the app current with Shopify API versions.

Supported Platforms

We integrate with the platforms your business already uses, ensuring a smooth workflow from checkout to delivery.

Use Cases

Live Carrier Rates at Checkout

Replace flat or weight-based shipping with live rates from UPS, FedEx, Canada Post, Purolator, DHL or an aggregator, calculated from your own carrier accounts.

Automated Fulfilment

When an order is ready, the app creates the label, fulfils the order in Shopify with tracking, and notifies the customer without manual steps.

Shopify Connected to an ERP

Orders flow into SYSPRO, Epicor Prophet 21 or NetSuite, the warehouse ships from there, and tracking and inventory come back to Shopify.

Multi-Location Shipping

Rate and ship from the correct location for each fulfillment order, including split shipments across warehouses.

Why Choose ZyroByte

Built to Shopify App Standards

GraphQL Admin API, OAuth installation, verified webhooks and current API versions.

Fast Rate Endpoints

Shopify gives carrier services a strict time limit with no retries, so we design rate endpoints with caching and fallbacks to answer well inside it.

Connected to Your Systems

Shopify wired into your carriers, WMS, OMS and ERP so order and shipping data flows without re-keying.

Ongoing Maintenance

We update the app for each Shopify API version and for carrier API changes.

Secure by Design

Minimal access scopes, HMAC-verified webhooks and carrier credentials stored encrypted server-side.

Built for Volume

Queued fulfilment processing and efficient API usage so flash sales and peak days do not back up.

Shopify Carrier-Calculated Shipping

Shopify lets an app register a carrier service that is called at checkout with the cart origin, destination and items. The app returns the rates customers see. The store must be on a plan that includes third-party calculated rates, or have the feature added. Shopify applies a read timeout of at most 10 seconds, shorter for high-traffic stores, and does not retry, falling back to backup rates on failure, so we build rate endpoints that answer quickly and degrade gracefully.

Shopify Fulfillment and Tracking Integration

Fulfillment in Shopify is organised around fulfillment orders assigned to locations. Our apps read the fulfillment orders that are ready, create labels through your carriers, and create fulfillments with tracking details so customers are notified and the order status page stays accurate.

Shopify to ERP and WMS Integration

For stores that run operations in an ERP or WMS, we connect Shopify to SYSPRO, Epicor Prophet 21, NetSuite or your warehouse system so orders flow out, and fulfillments, tracking and inventory flow back without manual work.

Shopify Inside a Multi-Carrier Platform

If Shopify is one of several sales channels, we can build a complete shipping platform that takes orders from Shopify, other storefronts and your ERP, rates and labels them across carriers, and writes tracking back to each channel.

Frequently Asked Questions

Shopify documents that carrier services are available on Advanced and higher plans, on Shopify plans with yearly billing, as a paid add-on on monthly plans, and on development stores. We confirm your eligibility during discovery.

Carrier service apps for checkout rates, fulfillment apps that create labels and fulfillments with tracking, Shopify Functions for delivery customization, and integration apps that connect Shopify to carriers, aggregators, ERPs and WMS platforms.

Shopify enforces a strict timeout on carrier service responses and does not retry, so we cache carrier responses, call carriers in parallel and return fallback rates if a carrier is slow.

Yes. We connect Shopify to SYSPRO, Epicor Prophet 21, NetSuite and custom systems for orders, fulfillments, tracking and inventory.

Any carrier or aggregator with an API, including UPS, FedEx, DHL Express, Canada Post, Purolator, EasyPost and Flagship.