Shipping API Integration
Choosing a carrier by habit instead of by cost leaves money on the table on every order. We build live rate-shopping directly into your order flow: calling FedEx, UPS and USPS per order, comparing every service tier, selecting the lowest cost automatically, and logging the full API response for traceability.
+ RULES
The scope, and what has to get right.
- Live rate-shopping per order. Calling FedEx, UPS and USPS APIs at the point of shipment, not once at setup, so the rate reflects current pricing and service availability.
- Every service tier compared. Ground, expedited and freight options compared automatically rather than defaulting to whichever carrier the warehouse is used to.
- Automatic carrier and service selection. The lowest-cost option that meets the delivery requirement is selected without a person choosing manually per order.
- ShipStation API integration. Where ShipStation is already the shipping tool, its API brings shipped orders and their shipping data into the business system, so cost and tracking land on the order record rather than staying in a separate portal instead of being exported and re-keyed.
- Label generation and tracking. Shipping labels generated directly from the selected rate and carrier, with tracking numbers flowing back into the order record.
Inside the system, not bolted on.
Full API response logged per carrier
Every rate call's raw response is stored, so a carrier choice can be audited after the fact rather than taken on faith.
Built into the order flow, not a separate tool
Rate shopping happens as part of the same system that manages the order, not a standalone shipping calculator staff have to switch to.
Cartonization feeding the rate calculation
Package dimensions computed from what is actually being shipped, so the rate quote reflects the real package rather than an estimate.
Multi-marketplace ERP, EDI and logistics automation for a US consumer electronics brand
- Off Sage, with the operating history intact: Customers, vendors, items and transaction history were migrated from Sage into a browser-based ERP covering order-to-cash and procure-to-pay, with a full general ledger, receivables and payables, so the business changed systems without losing its records.
- Native EDI inside the ERP: Every X12 document, including 850, 855, 856, 810, 846 and 997, is read and generated inside the ERP using the EdiFabric .NET library, with the mapping in its own code and no external translation service. Amazon Vendor Central (Wholesale and Direct Fulfillment) and Adorama connect directly over SFTP. Best Buy Optics, Costco Wholesale and Colony Brands run through SPS Commerce. Best Buy Purchasing, Bluestem Brands, QVC, Staples Advantage and Staples the Office Superstore run through CommerceHub (Rithum). BI Worldwide and Mason Companies run through Radial. The ERP uploads its own files to each network's FTP and reads the files the network delivers, and the network validates them and delivers them to the retailer. HSN, Harco Industries, Knocking and Verdi Commerce run on automated file exchange over FTP. Scheduled EDI jobs poll FTP on schedules as short as every ten minutes. Walmart runs through its API. The Walmart API integration imports WFS and seller-fulfilled orders, sends shipment confirmation and tracking back for seller-fulfilled orders, marks WFS orders shipped and invoices them automatically, turns returns into credit memos, and creates WFS inbound shipments. Every job is tracked on a monitoring dashboard.
- Every channel in one order queue: Amazon Vendor Central and Seller Central (SP-API), Walmart, HSN, QVC, Costco, several Shopify storefronts, eBay and direct wholesale accounts land in one system. Vendor Central purchase orders are accepted or rejected back to Amazon from the same screen that shows system, 3PL and allocated stock.
- Multi-warehouse and multi-3PL stock: Real-time inventory across an owned warehouse operated with a logistics partner, a second third-party warehouse and Amazon fulfillment locations, with warehouse transfer orders and an Amazon inbound shipment request action for FBA.
- FBA inbound shipment automation: End-to-end FBA inbound automation via SP-API: shipment creation, selection of the lowest-cost shipping plan, packing slip generation, label download and routing to the warehouse.
Also relevant: A profitability and re-marketing system for a US Amazon seller
Common questions.
Can you integrate ShipStation with our ERP?
Yes. ShipStation has an API, so shipped orders, shipping cost and tracking numbers can be imported into your ERP automatically and attached to the order they belong to, instead of being exported and re-keyed.
Which carriers do you integrate with?
FedEx, UPS and USPS are the most common combination we build, comparing all three per order, though the same approach extends to other carriers a business already uses.
Does this replace ShipStation or a similar tool?
It can, if the goal is rate-shopping and label generation built directly into your own ERP rather than a separate platform to keep in sync.
How does cartonization factor into the rate?
Package dimensions are computed from the actual items being shipped, so the rate call reflects the real package rather than a rough estimate, which matters for accurate cost comparison.
Can we audit which carrier was chosen for a past order?
Yes. The full API response per carrier and service tier is logged at the time of the call, so the decision can be reviewed later rather than trusted blindly.
Where this connects.
Is your warehouse choosing a carrier by habit or by cost?
Tell us which carriers you use today and we will tell you what live rate-shopping would likely save per order.