- Date format: ISO8601 - Details here : https://en.wikipedia.org/wiki/ISO_8601
- Phone format: E164 (ex: +33612345678 - must include + as a prefix and the country calling code) - details here: https://en.wikipedia.org/wiki/E.164
- All rounding calculation (e.g. Tax) are done on SumUp POS side using the banking rule of rounding half to even - cf here: https://en.wikipedia.org/wiki/Rounding#Round_half_to_even
- All discounts at the order level and item level are cumulative. The total discount is thus the sum of the order level and item level
- Amounts are reflected by shifted integer (x100). Example: 1.5€ become 150 cents