Amex reward points

Good morning. My name is Hayley Trinkoff and I am the Director of the Hun Fund here at The Hun School of Princeton. We are looking to pilot JustGiving so we can offer the payment method of Amex Reward points to our donors. We know this is a narrow scope of the platform, but want to make it as easy as possible for our donors to make a gift. Has anyone had success with Amex Rewards that would be able to weigh in?