A Partial Authorization occurs when an authorization is attempted for the full amount of the transaction and there are not enough funds available to cover the full amount, so an authorization for the amount available in the account is returned. This allows the cardholder to use the card presented for the amount available and for the merchant to obtain an additional form of payment for the difference. For Prepaid Gift Cards, the issuers will also return a card balance which will be printed on the receipt.
This feature is controlled by the HOST. Card Brands such as Mastercard, Visa, etc. require this feature to be enabled for ALL cards. This is not a feature we can disable. If there are applications without this feature or that allow you to disable this feature it means they have not yet updated to the latest requirements set by the card brands