Hello, I could not contact phone or chat support (closed on Sunday), thus my post here. A client complained about not being able to purchase my book on my ConstantContact eStore. I tried myself, and was also unable. Example of product: https://machinelearningrecipes.com/store/product/p_2849392 When you click on "check out" (see screenshot), it goes to a blank page, and it is not possible to proceed. I had to tell the customer to use my other e-Store, hosted on WordPress (not connected to Constant Contact), which is working. Thank you for looking into this. Vincent
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