C# XML to REST file conversion

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gesser  |  Canada  

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Total Purchased $1,217

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Member Since: July 2008
Location: Canada

I have a new fulfillment house that needs to receive the orders via REST.
I need a C# Visual Studio 10 Framework 4.0 program to upload the orders in an XML, convert them to REST, and then post them to the fulfilment house.
I envision an Import button that take the XML file from a given location and uploads the pertinent data into a listview where the information could be viewed and maybe edited slightly
Then another button that would go through one order at a time and upload it to the fulfilment house.
Their specification is http://calm.sixworks.co.uk/uploads/docs/Six-OrdersAPIv1.4Specification.pdf.
Their JSON example for me is
{
"api_key":"d6b84a9fc3ef2ec03c04c5b69c927128",
"allow_preorder":true,
"update_stock":true,
"order":
{
"client_ref":"test-api",
"date_placed":"Thu,
29 Dec 2011 16:12:13 +0000",
"postage_speed":1,
"postage_cost":0.01,
"ShippingContact":
{
"name":"Test Person",
"company":"Test Company",
"email":"  [obscured]  ",
"phone":"0800TEST",
"address":"Test House",
"address_contd":"1 Test Street",
"city":"Test City",
"county":"Test County",
"country":"United Kingdom",
"postcode":"TE1 2ST"
},
"BillingContact":
{
"name":"Test Person",
"company":"Test Company",
"email":"  [obscured]  ",
"phone":"0800TEST",
"address":"Test House",
"address_contd":"1 Test Street",
"city":"Test City",
"county":"Test County",
"country":"United Kingdom",
"postcode":"TE1 2ST"
},
"items":
[

{
"client_ref":"5060194210000",
"quantity":1,
"price":0.99
},

{
"client_ref":"5060194210017",
"quantity":2,
"price":1.99
}
]
}
}