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OpenCart + atoship
Free OpenCart extension. Auto-sync orders, access discounted multi-carrier shipping rates, print labels in bulk, and write tracking back to your store.
How it works
Up and running in under 5 minutes
Download the extension
Grab the free atoship extension ZIP file. No marketplace account or license key needed.
Install in OpenCart admin
Go to Extensions > Installer in your OpenCart 4.x admin panel and upload the ZIP. Then enable the module under Extensions > Modules.
Connect to atoship
Enter your atoship API key in the extension settings. Your store is now linked and ready to sync.
Start shipping
Orders flow into atoship automatically. Compare carrier rates, buy labels, and tracking numbers sync back to OpenCart.
Everything you need to ship from OpenCart
A complete shipping solution built specifically for OpenCart store owners
100% Free Extension
No subscription fees, no per-label surcharges. The OpenCart extension is completely free to install and use.
Auto Order Sync
Orders sync via webhooks in real time and a background cron job every 30 minutes as a safety net. Never miss an order.
Multi-Carrier Rates
Compare live rates from USPS, UPS, FedEx, DHL, and more in a single view. Pick the cheapest or fastest option.
Bulk Label Printing
Select multiple orders and print shipping labels in one batch. Supports PDF, ZPL, and EPL2 formats.
Tracking Writeback
When a label is created, the tracking number and carrier are automatically written back to your OpenCart order.
OpenCart 4.x Support
Built for OpenCart 4.x with the modern extension architecture. Secure Bearer token authentication.
Step-by-step setup guide
Detailed instructions to get the extension running on your store
Download and install the extension
- Download the atoship-for-opencart.zip file from the button above
- Log into your OpenCart admin panel
- Navigate to Extensions > Installer
- Click Upload and select the ZIP file
- Wait for the installation to complete
Enable the module
- Go to Extensions > Extensions and filter by Modules
- Find "AtoShip Shipping" in the list
- Click the green Install (+) button
- Click Edit to open the module settings
Connect your atoship account
- Sign up for a free atoship account if you haven't already
- Copy your API key from the atoship dashboard under Settings > API Keys
- Paste the API key into the extension settings in OpenCart
- Click Save — the extension will verify the connection automatically
Configure and start shipping
- Your existing OpenCart orders will begin syncing within minutes
- New orders sync instantly via webhooks
- Go to your atoship dashboard to view orders, compare rates, and print labels
- Tracking numbers are written back to OpenCart automatically when labels are purchased
Frequently asked questions
Is the OpenCart extension really free?
Yes. The extension itself is completely free with no license fees. You only pay for shipping labels at the discounted carrier rates available through atoship.
Which version of OpenCart is supported?
The extension is built for OpenCart 4.x and uses the modern extension architecture introduced in that version. OpenCart 3.x is not supported at this time.
How does order syncing work?
Orders sync in two ways: real-time webhooks trigger whenever a new order is placed, and a background cron job runs every 30 minutes to catch anything that may have been missed.
Does tracking update automatically in OpenCart?
Yes. When you purchase a shipping label in atoship, the tracking number, carrier name, and a tracking URL are automatically written back to the corresponding OpenCart order.
Which carriers can I use?
atoship supports USPS, UPS, FedEx, DHL, and many more. You can use our pre-negotiated discounted rates or connect your own carrier accounts.
Do I need to modify any OpenCart core files?
No. The extension installs cleanly through the standard OpenCart Installer without modifying any core files. It can be uninstalled at any time.
Ready to ship smarter from OpenCart?
Download the free extension and start saving on every shipment today.