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A store hash is a store identifier for BigCommerce.
To Obtain the Store Hash
Login to BigCommerce,
Select Advance Settings from the left menu,
Select API Accounts,
Select Create API Account,
The store hash value can be derived from the API Path, the store hash is the xxxxxxxxx value in the following url https ://api.bigcommerce.com/stores/xxxxxxxxx/v3/, record the store hash as it is not accessible after API account creation.