How to apply the BigCommerce API:
Go to BigCommerce Store control panel, click Account Setting in the menu.
Click API Accounts
Click Create API Account
Customize your API Name, save API Path link (needed later).
Choose Modify for all-access, click Save
A successful save will display the pop-up shown below. It will contain the API credentials that your app will need for OAuth access. Also, a .txt file containing the same credentials will (on most browsers) download to your computer.
How to Integrate Bigcommerce Store with EIZ
Log in your EIZ Account > Click the Marketplace/Store Icon on the upper left-top of the page, click Bigcommerce and subscribe it.
The page will be automatically redirected to BigCommerce setting, click “Connect to New Store”
Copy and Paste all the information needed (Access Token, Client ID, API Path).
Click “Validate and Save”
You have now completed the Bigcommerce integration, switch on order sync, and start to process your Bigcommerce orders in EIZ!