Follow the below steps:
1. Login to the Woocommerce admin dashboard.
2. In the Menu on the left, click on Woocommerce and then settings
3. Click on Advanced Tab on the Settings page.
4. Click on "REST API" button and then click on 'Add key"
5. In key details give any 'Description' and set Permission-->>Read
6. Click on "Generate API Key"
7. Copy Consumer Key and Consumer Secret and paste it in the input box for connecting wordpress store in BigAtom.