invoiceHeader_referenceDataNumber {#invoice-header-reference-data-num}
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Reference number associated with the invoiceHeader_referenceDataCode field.  
This field is available only on the `American Express Direct` and `Barclays` processors.  
The meaning of this reference number is defined by the invoiceHeader_referenceDataCode field.

> This field is a pass-through. The value in this field is not verified or modified in any way before it is sent to the processor.

Specifications {#invoice-header-reference-data-num_d1252e42}
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* **Data Type:** String
* **Data Length:** 30

Mapping Information {#invoice-header-reference-data-num_d1252e61}
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* REST API Field: orderInformation.invoiceDetails.referenceDataNumber
* SCMP API Field: reference_data_number
* Simple Order API Field: invoiceHeader_referenceDataNumber

Processor Field Names {#invoice-header-reference-data-num_d1252e85}
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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