Some merchants prefer their customers have earned a specific amount of loyalty before they are able to redeem it. These merchants can apply a loyalty redemption threshold to their program which reflects the amount a customer needs to earn before they can redeem.
For example; A customer has come in and wishes to spend $45 from the loyalty they've earned. You have confirmed that there is $75 in earned loyalty but when you swipe the card to redeem the funds, you get a message advising that the amount doesn't meet the requirements because there is a redemption threshold of $50 applied.
In this case, you'll need to advise the customer of the threshold and give them the option to top-up their purchase. Alternatively you can speak to your program administrator about turning this function off.