Discount Eligibility Issue and Problem

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The current beta feature for Discount Eligibility is not functioning correctly.

At present, we can mark an item as not eligible for discounts, and that status displays properly in both the cart and invoice. When a discount is applied to the transaction, only the eligible items are shown as discounted, which appears to work as intended.

However, the issue occurs during payment processing. When the customer attempts to pay for the transaction, the system will not accept payment. We initially believed the problem was related to a declined card because we tried multiple payment methods, all resulting in failure. The only error displayed on both customer-facing and staff displays is "Card Error."

After troubleshooting, I went into the dashboard and changed the item to be discount-eligible. I then manually adjusted the discount on each individual item instead of applying a discount to the entire transaction. Once I did that, the payment processed successfully.

This suggests there is a problem in the transaction finalization or payment processing logic when discount-ineligible items are included in a sale that also contains discounted items. The purpose of the Discount Eligibility feature is to allow us to exclude specific items from discounts while still applying discounts efficiently to the remaining eligible items. Without this functionality, we are forced to manually adjust each item individually, which becomes extremely time-consuming when there are large transactions with dozens of items. For example, if 80 items are eligible for a discount and only one item is not, manually adjusting each line item is not a practical solution.

Please investigate the interaction between the Discount Eligibility feature and payment processing, as it appears to be preventing transactions from being completed successfully.