discount processing; validation (of a parking ticket)
Used in commercial or service contexts for applying a discount or validating a parking ticket to reduce or waive the fee.
Validation of parking tickets is done at the store register.
If you show your membership card, the discount processing will be applied.
割引 is the general noun for 'discount'; 割引処理 specifically refers to the act or system of processing that discount.
処理 is a broad term for 'processing' or 'handling'; 割引処理 narrows it to discount-related processing.
Compound of 割引 (わりびき, 'discount') and 処理 (しょり, 'processing').