As a non-profit allowing credit card transactions is a risky move because of the additional fees but it is inevitably what people prefer to use. Trying to make it easier for people to attend our events we have allowed for credit cards to be used to purchase tickets. When we managed event registration without constant contact we applied a different cost for those that wanted to convenience of paying with a credit card (slightly higher to cover the service fees). Using to constant contact event registration is great but there is no way to adjust the rate when people choose to pay with a credit card. You could put two separate rates on your event and hope people would do the honorable thing or pay attention to the different rates but there is a big risk there. This should be an improvement made to the registration service.
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