Before you create an order, calculate the basket to update all prices and discounts according to the LS Central calculation engine.
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OneList Basket Calculation
<soapenv:Body>
<ser:OneListSave>
<ser:oneList>
<ns1:CardId>10023</ns1:CardId>
<ns1:Items>
<ns1:OneListItem>
<ns1:ItemDescription>Skirt Linda Professional Wear</ns1:ItemDescription>
<ns1:ItemId>40020</ns1:ItemId>
<ns1:Quantity>2</ns1:Quantity>
<ns1:VariantDescription>YELLOW/38</ns1:VariantDescription>
<ns1:VariantId>002</ns1:VariantId>
</ns1:OneListItem>
</ns1:Items>
<ns1:ListType>Basket</ns1:ListType>
<ns1:StoreId>S0001</ns1:StoreId>
</ser:oneList>
<ser:calculate>true</ser:calculate>
</ser:OneListSave>
</soapenv:Body>
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To add optional Coupon to the basket, add this to the request
<ns1:PublishedOffers>
<ns1:OneListPublishedOffer>
<ns:Id>XMAS2018</ns:Id>
<ns1:Type>Coupon</ns1:Type>
</ns1:OneListPublishedOffer>
</ns1:PublishedOffers>
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Modify Price of an Item
<ns1:OneListItem>
<ns1:ItemDescription>Shipping</ns1:ItemDescription>
<ns1:ItemId>66010</ns1:ItemId>
<ns1:Quantity>1</ns1:Quantity>
<ns1:Price>1.00</ns1:Price>
<ns1:PriceModified>true</ns1:PriceModified>
</ns1:OneListItem>OneListCalculate returns Order Object with order lines with prices and calculated amount and discount information, if any. You can then use this Order object to finalize the order. Add contact information, address for shipping, and payment information, and then the order is ready to be sent in “as is” with OrderCreate.