FE with discounts

Discounts are applied per line, not as a total for the whole document. Each line declares the montoDescuento (in the document’s currency) and the naturalezaDescuento, which is the text Hacienda (Costa Rica’s tax authority) requires to justify it.


{
  "tipo": "FacturaElectronica",
  "idUsuario": 7,
  "cliente": { "idCliente": 42 },
  "condicionVenta": "01",
  "medioPago": "01",
  "moneda": "CRC",
  "lineas": [
    {
      "idProducto": 100,
      "cantidad": 10,
      "precioUnitario": 5000.00,
      "montoDescuento": 5000.00,
      "naturalezaDescuento": "Descuento por volumen 10%"
    },
    {
      "idProducto": 101,
      "cantidad": 1,
      "precioUnitario": 15000.00,
      "montoDescuento": 1500.00,
      "naturalezaDescuento": "Cliente frecuente"
    }
  ]
}

The montoDescuento is an absolute value, not a percentage. To apply a 10% discount on precioUnitario × cantidad, the calculation must be done on the integrator’s side and the result sent.