# Tax identification numbers
The Digital River Extension allows shoppers to enter their **Tax Identification Number** during order placement, have the ID validated, and, if appropriate, the order totals will be updated accordingly.
The shopper must:
1. Select the **This is a Business Purchase** check box on the **Shipping Address** screen, when purchasing physical goods, or on the **Payment Information** screen when purchasing digital or virtual goods.\
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2. Enter the **Tax ID** and click **Apply**.
## **Order summary before application of the Tax ID**
## **Order summary after application of the Tax ID**
