How can I send Comments/Notes in an e-invoice

Sometimes, you may want to include an additional note or comment for the recipient of the invoice. PEPPOL and other networks support sharing comments at the invoice level. With the Billit API, you can achieve this by using the Invoice.Note property in custom fields.

Below Json Example with Note in the Custom Fields part:

{
 "OrderType": "Invoice",
 "OrderDirection": "Income",
 "OrderNumber": "QS-003",
 "OrderDate": "2025-05-05",
 "ExpiryDate": "2025-06-30",
  "CustomFields"  : {
     "Invoice.Note": "header note description: additional text information", 
    },
  
  "Customer": {
   "Name": "Billit",
   "VATNumber": "BE0563846944",
   "PartyType": "Customer",
   "Identifiers": [
        {
        "IdentifierType": "GLN",
        "Identifier": "5430003799999"
        }
    ],
   "Addresses": [
        {
        "AddressType": "InvoiceAddress",
        "Name": "Billit",
        "Street": "Oktrooiplein",
        "StreetNumber": "1",
        "City": "Ghent",
        "Box": "301",
        "CountryCode": "BE"
        },
        {
   ]
   },
 "OrderLines": [
  {
   "Quantity": 1,
   "UnitPriceExcl": 10.0,
   "Description": "Box of cookies",
   "VATPercentage": 6
   },
    {
   "Quantity": 2,
   "UnitPriceExcl": 3.75,
   "Description": "Sticks",
   "VATPercentage": 21
   }
 ]
}