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orderInformation. amountDetails.taxAmount {#order-info-amount-details-tax-amount}
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Total tax amount for all items.  
This field is available only on the `American Express Direct` and `Barclays` processors.

Specifications {#order-info-amount-details-tax-amount_Specifications}
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* **Data Type:** String
* **Data Length**
  * Canadian dollars (CAD): 7
  * US dollars (USD): 9

Mapping Information {#order-info-amount-details-tax-amount_Mapping}
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* REST API Field: orderInformation.amountDetails.taxAmount
* SCMP API Field: total_tax_amount
* Simple Order API Field: purchaseTotals_taxAmount

Processor Field Names {#order-info-amount-details-tax-amount_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  
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