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Calculating the Grand Total for Line Items

Most Thunes payment methods require the grand total amount of a purchase to be in the request. Include the grand total in the
purchaseTotals_grandTotalAmount
 request field.
To calculate the grand total amount for multiple line items, use this formula:
Sum of (unit price x quantity) for all items + sum of (item-level tax amount) for all items
Here is the same formula with the respective API fields:
Sum of (
item_#_unitPrice
 x
item_#_quantity
) for all items + sum of (
item_#_ taxAmount
) for all items
Grand Total Amount
This example shows the proper syntax and calculation of a grand total amount within an API request.

Figure:

Including the Grand Total Amount in an API Request Message
<item id="0">    
    <unitPrice>100.00</unitPrice>  
    <quantity>1</quantity>     
    <productCode>123456</productCode>
    <productName>Shirt</productName>
    <productSKU>test1</productSKU>
    <taxAmount>15.00</taxAmount>
    <totalAmount>115.00</totalAmount>
    <productDescription>Red</productDescription> 
</item>
<item id="1">
    <unitPrice>75.00</unitPrice>  
    <quantity>2</quantity>     
    <productCode>654321</productCode>
    <productName>Pants</productName>
    <productSKU>test2</productSKU>
    <taxAmount>25.00</taxAmount>
    <totalAmount>175.00</totalAmount>
    <productDescription>Green</productDescription>
</item>
<purchaseTotals>
    <grandTotalAmount>290</grandTotalAmount>
</purchaseTotals>
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