Payment Policy

Last updated: October 29, 2026

Accepted payment methods

We accept Visa, Mastercard, American Express and Discover. Apple Pay and Google Pay are accepted where your device and browser support them. We do not accept PayPal, checks or bank transfers for website orders.

How payments are processed

Card payments are processed by Stripe. Your card details are entered on a secure form and are not stored on our servers. Your bank may ask you to complete a verification step before the payment is approved.

When you are charged

Your card is charged when the order is placed. If we cannot fulfil part of an order, we refund that part to the original payment method.

Currency and tax

All prices are in U.S. dollars. Sales tax, where applicable, is calculated at checkout based on the shipping address.

Declined payments

If a payment is declined, no order is created. Common causes are an address that does not match the card’s billing address, a card that does not allow online purchases, or a bank security block. Checking the billing address or contacting the card issuer usually resolves it.

Refunds

Refunds are issued to the original payment method. Once we process a refund, your bank usually shows it within 5 to 10 business days.

Purchase orders

U.S. schools, libraries and businesses can order by purchase order. Email [email protected] with the titles and quantities; we will reply with a quote, a W-9 and payment instructions.