Here is my updated payload with a change in cart and order_id:
{
"billing_address": {
"city": "austin",
"country": "USA",
"email": "mrgattispizza@delivers.com",
"name": "joe schmo",
"phone": "4592222",
"state": "tx",
"street1": "123 foo-bar ln",
"zip": "78701"
},
"cart": <my-cart-id-integer-value>,
"cart_order_id": "thats-some-funky-1234",
"grand_total": 123.45,
"lines": [
{
"cart_orderitem_id": "abc.123",
"product": {
"amazon_extra_info": {
"asin": "55555",
"listing_id": "12356",
"pending_quantity": 4
},
"cost": 1.69,
"name": "special product name",
"price": 69.69,
"sku": "sku1",
"taxable": "false",
"weight": 1
},
"quantity": 2
},
{
"cart_orderitem_id": "abc.456",
"product": {
"cost": 3.45,
"name": "Plastic Toy",
"price": 1.23,
"sku": "sku2",
"taxable": "false",
"weight": 2
},
"quantity": 1
}
],
"order_date": "2015-12-09T12:01:00.855700",
"order_id": "<myorder-id>",
"product_amount": 100.1,
"shipping_address": {
"city": "austin",
"country": "USA",
"email": "jenny@igotyournumber.com",
"name": "joe schmo",
"phone": "8675309",
"state": "tx",
"street1": "123 foo-bar ln",
"zip": "78701"
},
"tags": [
{
"color": "#FFFFFF",
"text": "Unpaid"
},
{
"color": "#C0C0C0",
"text": "Alert"
}
],
"tax_amount": 1.23
}