How to represent mandatory cash rounding

Since January 1, 2018, 1 and 2 cent coins are no longer produced.

Under Italian law (DL n. 50/2017), the total amount due, if paid entirely in cash, must be rounded to the nearest €0.05:

€0.01–€0.02 → rounded down to €0.00
€0.03–€0.04 → rounded up to €0.05
€0.06–€0.07 → rounded down to €0.05
€0.08–€0.09 → rounded up to €0.10

This rule applies only if the payment is made entirely in cash.

The “Documento Commerciale Online” web procedure on which SIGN IT lite is based technically tolerates a discrepancy of up to €0.02 between the document total and the payment total.

Rounding down The difference (€0.01 / €0.02) is recorded as a discount at payment level: payments[type=CASH].details.discount

Example: if total_vat.inclusive is €23.02, the cash amount due is €23

"payments": [
        {
          "type": "CASH",
          "details": {
            "amount": "23.00",
            "discount: "0.02"
          }
        }
      ]

**Rounding up ** The difference (€0.01 / €0.02) is added to the payment amount: payments[type=CASH].details.amount

Example: if total_vat.inclusive is €23.09, the cash amount due is €23.10

"payments": [
        {
          "type": "CASH",
          "details": {
            "amount": "23.10"
          }
        }
      ]

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