1. Log into your ShipTime account.
2. On the left-hand side, select Sales Channels.
3. Click on the option for, Connect New Store.
4. Place the mouse cursor over the OpenCart logo, and then click on the Plus sign.
5. Next, in a new tab, login to your OpenCart admin page.
6. On the left-hand side of the screen, select System.
7. Now select Users.
8. Click on the option for API.
9. In the upper-right hand side of the screen, click on the blue “Plus” sign.
10. First, type in an API Username.
11. Then, click on the button that says Generate under the API Key field.
12. Copy the API Key that is automatically generated.
13. Next, select the Status dropdown and select Enabled.
14. Now select the tab for IP Addresses.
15. Enter in as many IP Addresses needed for this key.
16. Finally, in the upper-right hand corner, click on the blue “Save” icon.
17. Return to your ShipTime account.
18. Paste the API key where it shows, Store Key.