Opencart Shipstation Shipping is one of the best solutions which provides satisfactory shipping services to the customers by allowing various shipping carriers such as USPS, UPS, FedEx, DHL, et
1) The admin can retrieve the API key and the API secret by creating the Shipstation account.
2) A title of the Shipstation Shipping is set by the admin.
3) The shipping carriers such as USPS, DHL, FedEx, UPS can be set by the admin.
4) The admin can add the weight and the length class for the package.
5) A handling fee may be added by the admin which adds up with the shipping fee in the frontend.
6) The admin can even add the geo zones and postal code.
7) The admin can manage the tax class for the shipstation.
8) The shipstation rate will be display with applicable tax.
9) Once the customer places the order, the admin can export the order to shipstation. Also, the admin can generate a shipping label for the order.
10) The admin can generate the packing slip and the dispatch note for the order.
11) In the frontend, the customer can view the available shipping methods with real-time freight rates.
12) The customer can view the tracking number for the order.
13) The admin can calculate shipping cost on the basis of dimensions(Length, width, height & weight).

Installation
First, extract the downloaded zip file. After that, open the correct Opencart Version Folder. According to Opencart Version installed in your system.
Then, upload admin, catalog and Packer.php to the Opencart root directory.


Refresh Modifications
The user can navigate through Extensions > Modifications. Now click the Refresh button as visible in below screenshot


Edit User Groups
After that, go to System > Users > Usergroups. And then edit ‘Administrator’. Click Select All for both Access Permission and Modify Permission and Save it.
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Installation Process
Now navigate to Extensions > Extensions > Shipping. Find OpenCart Shipstation shipping from the list. Click the Install button as visible in the screenshot below.