I am an American customer and do not have to pay sales tax. How can I submit the custom exemption certificate? Follow Sandra Portmann July 09, 2019 06:21 Updated Please send the certificate directly to maxon precision motors in America. Orders from the online-shop are not delivered duty paid. Related articles Which payment methods are there in the online-shop? I would like to pay in the online-shop with my credit card. Unfortunately it does not work. Why? Comments 0 comments Please sign in to leave a comment.