orderInformation. lineItems\[\].unitOfMeasure {#order-info-line-items-unit-of-measure}
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Code that specifies the unit of measure for the item.  
Do not use all zeros or spaces in this field.  
This field is available only on these processors: `American Express Direct`, `Barclays`, `Chase Paymentech Solutions`, `Elavon Americas`, `FDC Compass`, `FDC Nashville Global`, `GPN`, `OmniPay Direct`, `TSYS Acquiring Solutions`, `Visa Platform Connect`, `Worldpay VAP`.  
This processor has specific requirements:  
For `American Express Direct`, see the EDI codes for units of measurement at [el355.htm](https://ws2.segment.co.il/Public/EDI-Segment/x12-4040/EDI_4010/el355.htm "").

Specifications {#order-info-line-items-unit-of-measure_Specifications}
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* **Data Type:** String
* **Data Length**
  * `American Express Direct`: 2
  * `Barclays`: 80
  * `Chase Paymentech Solutions`: 3 (Mastercard), 12 (Visa)
  * `Elavon Americas`: 3 (Mastercard), 12 (Visa)
  * `FDC Compass`: 3 (Mastercard), 12 (Visa)
  * `FDC Nashville Global`: 12
  * `GPN`: 12
  * `OmniPay Direct`: 12
  * `TSYS Acquiring Solutions`: 12
  * `Visa Platform Connect`: 12
  * `Worldpay VAP`: 12
  * Other processors: 12

Mapping Information {#order-info-line-items-unit-of-measure_Mapping}
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* REST API Field: orderInformation.lineItems\[\].unitOfMeasure
* SCMP API Field: unit_of_measure
* Simple Order API Field: item_#_unitOfMeasure

Processor Field Names {#order-info-line-items-unit-of-measure_Processors}
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This list provides the Level II/Level III processor field name for each processor that supports Level II or Level III data:

* `American Express Direct`: Does not apply
* `Barclays`: Unit of Measure
* `Chase Paymentech Solutions`: Unit of Measure
* `Elavon Americas`: Unit of Measure
* `FDC Compass`: Unit of Measure
* `FDC Nashville Global`: Item Bulk / Unit of Measure
* `GPN`: Unit of Measure
* `OmniPay Direct`: Unit of Measure Code / Item Unit of Measure
* `TSYS Acquiring Solutions`:
  * Mastercard: Item Unit of Measure
  * Visa: Unit of Measure/Code
* `Visa Platform Connect`: unitOfMeasure
* `Worldpay VAP`: unitOfMeasure