Before you continue please note only store owners can create API Accounts.
Log in to BigCommerce and navigate to Advanced Settings > API Accounts
Now click on Create API Account
Now choose Create V2/V3 API Token
You can enter any name (for example: FeedArmy)
Copy the API Path to a text file (for future reference)
Enable the following resources and set to read-only
Click on Save, and make sure you don’t skip the next step as this info can not be viewed again once closed.
Copy and paste the Client ID, Client Secret and Access Token to the text file. Make sure to label each token.
Log in to FeedArmy and go Import Tools > Platform Settings, now select BigCommerce form the menu. Under the credentials tab enter in your BigCommerce details.
From the API Path copy and paste the id between https://api.bigcommerce.com/stores/ and /v3/
Taking the example in the above image that would be hohmvoawvj
add this value to the store hash field
Now copy and paste the client id, client secret and access token
Choose which target country you want to advertise for
Click on load categories, you can now map each BigCommerce category