According to an update from the Village of Mukwonago, they have been contacted by their credit card processor saying that some residents are using a Mastercard to pay their utility bill, and have received a “declined” message. This is due to a system upgrade for security that is requiring additional information, and the processor is working through this. If you are trying to pay your utility bill online and have this issue, call the utility billing department at (262) 363-6420 ext. 2118.
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