Shipment confirmation polling.

1-request.json

{
    "message_id": "88af1dc5fe53543f1200f517",
    "message": "ctl:shipment:confirmation:poll",
    "payload": {
      "parameters": [
          {
              "name": "ctl.last_confirmation_shipment",
              "value": "H00000000001"
          },
          {
              "name": "ctl.customer_id",
              "value": "12345678"
          }
      ]
    }
}

200-response.json

{
    "message_id": "88af1dc5fe53543f1200f517",
    "messages": [
        {
            "message": "shipment:confirm",
            "inflate": true,
            "payload": {
                "shipment": {
                   "order_number": "R1234567"
                   "number": "H00000000002",
                   "tracking": "ABC123456"
                }
            }
        },
        {
            "message": "shipment:confirm",
            "inflate": true,
            "payload": {
                "shipment": {
                   "order_number": "R1234568"
                   "number": "H00000000004",
                   "tracking": "ABC455678"
                }
            }
        }
    ],
    "parameters": [
        {
            "name": "ctl.last_confirmation_shipment",
            "value": "H00000000003"
        }
    ]
}

500-failure.json

{
  "notifications": [
    { "level": "error", "subject": "Failed to find last shipment", "description": "Failed to find last shipment 'H00000000001'" }
  ] 
}