PHP 7.1 and above
Download FlagShip For Opencart. Extract flagship.ocmod.zip.
To install the extension, navigate to Admin > Extensions > Installer
Refresh modifictaions from the top right corner on Modifications page ( Admin > Extensions > Modifications )
Refresh cache from Dashboard > Settings (Gear icon in the top right corner)
Navigate to Admin > Extensions > Extensions > Shipping Install FlagShip Shipping
Enter your FlagShip token, flat handling fee, percentage markup to be added to shipments. Enable the extension and set a sort order. If you use certain shipping boxes, you can add their dimensions here.
Be sure to set details for your store.
Admin > System > Settings > Store > Store(tab) >
Your customers will now see FlagShip shipping rates when choosing a shipping method.
You can Ship all your orders with FlagShip