invoiceHeader_referenceDataCode {#invoice-header-reference-data-code}
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Code that identifies the value of the invoiceHeader_referenceDataNumber field.  
This field is available only for the `American Express Direct` processor.  
This field is a pass-through, which means that this value is not verified or modified in any way before it is sent to the processor.

Specifications {#invoice-header-reference-data-code_d727e33}
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* **Data Type:** String
* **Data Length:** 3

Mapping Information {#invoice-header-reference-data-code_d727e52}
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* REST API Field: orderInformation.invoiceDetails.referenceDataCode
* SCMP API Field: reference_data_code
* Simple Order API Field: invoiceHeader_referenceDataCode

Processor Field Names {#invoice-header-reference-data-code_d727e76}
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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