What are the payment options for the online store? Victoria Phucas November 04, 2019 20:34 Updated Follow VISA, MasterCard, American Express, and Discover are accepted. Members, depending on their level, receive discounts and free access to products. Learn more here. Related articles Can I order with a purchase order through the online store? Can I make a payment online without a credit card? Why types of documents and products does CLSI offer? How can I obtain permission to share a CLSI document with my organization? How do I access invoices and purchased PDFs?