I'm afraid that currently the webstore won't allow you to use PayPal if your redeem a discount. PayPal gets a little tricky about this.
Email sales@stardock.com regarding your credit card order error message and we'll be happy to assist.
Just to clarify, the 20% discount on Master Skins is only available to current WinCustomize Subscribers. Object Desktop subscribers don't receive this discount.
However, Object Desktop subscribers are eligible for discounts on most of the Stardock Premium Suites (available from https://www.stardock.com/products/odnt/od-discount.asp).
There are many great features available to you once you register, including:
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