Support Center Billing & Payments Billing & Payments Page: Why am I being charged sales tax? Page: What currencies do you accept? Page: How do I obtain a sales tax refund if I'm tax-exempt? Page: What payment methods do you accept? Page: Is there any money-back guarantee? Page: Do you charge VAT and how do I get a VAT refund? Page: Can I pay by Purchase Order? Page: Is sales tax included in the prices listed on your website? Page: Can I pay using PayPal?