Item-Level Fields Table 9 Item-Level Fields for FDMS Nashville CyberSource Field Name Description Used By: Required (R) or Optional (O) Data Type & Length item_#_invoiceNumber Field to support an invoice number for a transaction.You must specify the number of line items that will include an invoice number. By default, the first line item will include an invoice number field. The invoice number field can be included for up to 10 line items. See Numbered Elements. Level II ■ Visa (O) ■ Mastercard (O) String (23) item_#_unitPrice Per-item price of the product. This value cannot be negative. You can include a decimal point (.), but you cannot include any other special characters. CyberSource truncates the amount to the correct number of decimal places. See Numbered Elements. Level II ■ Visa (R) ■ Mastercard (R) String (15)