List a specific invoice of project Level

Example response

{
  "result": {
    "comments": "sample comments",
    "currency": "sample currency",
    "custom_fields": [
      {
        "param_name": "sample param_name",
        "string_value": "sample string_value"
      }
    ],
    "invoice_number": "sample invoice_number",
    "invoice_to": "sample invoice_to",
    "items": [
      {
        "custom_fields": [
          {
            "param_name": "sample param_name",
            "string_value": "sample string_value"
          }
        ],
        "spec_name": "sample spec_name"
      }
    ],
    "order_reference": "sample order_reference",
    "order_title": "sample order_title",
    "payment_method": "sample payment_method",
    "prepared_by": "sample prepared_by",
    "reference_number": "sample reference_number",
    "status": "sample status",
    "transactional_currency": "sample transactional_currency"
  },
  "status_reason": "sample status_reason"
}