New features
1. Input parameters "authorizationCode" and "referenceNumber" have been added to API call savePayment.
2. Input parameters "documentDateStart" and "documentDateEnd" have been added to API call getPurchaseReport.
3. Input parameter "documentIDs" has been added to API call deletePurchaseDocument.
4. Feature "Minimum Password Length" has been implemented.
Fixes
1. Promotions will no longer apply to non-discountable products.
2. Fixed: API call savePurchaseDocument did not allow to reset the field "paid" (to set it to 0).