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To connect BigCommerce in the Cart2Cart Migration Wizard, create a store-level API account and copy the API path, Client ID, and Access token.
1. Log in to your BigCommerce control panel.
2. Go to Settings → Store-level API accounts.
3. Click + Create API Account.
4. Choose token type V2/V3 API token.
5. Enter a name (for example Cart2Cart Migration).
6. Note the API path shown on the form (you will need it in the wizard).
7. Under OAuth scopes, set modify (or the highest write access available) for the resources Cart2Cart needs—typically products, customers, orders, and related entities. For a full migration, grant modify where listed.
8. Click Save.
9. In the confirmation dialog, copy the Client ID and Access token immediately (and keep the downloaded .txt file). BigCommerce will not show the token again.
10. Paste the API path, Client ID, and Access token into the corresponding Cart2Cart Migration Wizard fields.
Official reference: BigCommerce — Store API Accounts.
If admin login validation fails instead of API fields, see BigCommerce Admin Access Validation Error.
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