Get list of Export Postings

1. A new object property has been added to Get list of Export Postings called paymentCondition. This provides information about the cash discount attached to the invoice.
2. Invoice dueDate has move out of splitPostings and into the successfulPostings

{
  "successfulPostings": [
    {
      "dueDate": "2024-01-01T00:00:00Z",
      "paymentCondition": {
        "name": "Credit Card Discount",
        "discountPercentage": 10,
        "discountPaymentDate": "2024-01-01T00:00:00Z"
      }
    }
  ]
}