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# Order.external_source property

This value identifies an external system that generated the order and submitted it to BigCommerce via the Orders API. When supplying the value, we recommend combining the type of system and vendor, e.g., ERP (Acumatica) or POS (Square). If you are migrating historical orders processed on another eCommerce platform to BigCommerce, supply the following code as the value: M-MIG. This code will exclude historical orders from the store’s GMV/order count, which factors into pricing. If you do not provide a value, then it will default to null.

Signature:

external_source: string | null;