This parameter helps to retrieve the coupon code in the desired letter cases. By default, the system automatically converts the coupon code to upper case. The query itself is not case sensitive. Supported Values: LOWER: Converts the coupon code to lower case. UPPER: Converts the coupon codes to upper case. AS_IT_IS: It ensure that the coupon code is retrieved exactly as it was created or provided, without altering the letter case. For instance, if the code is "abAB123," it should be retrieved and displayed as "abAB123," maintaining its original formatting.