I am just posting my boss' question (given below) to this listserv in order to gather more feedback. I will relay you responses to him.
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Quoted message below:
We are changing vendors for our online payment services through our catalog, and wondering if anyone has any experience with some of these. Our two main options are Comprise Smartpay and ProPay.
Thanks for any insight you can provide!
Digital Services Supervisor
Jackson County Library Services