Use case:

1. Order premium domain registration
2. Select PayPal as the payment method
3. Complete the order (PayPal account is charged, the invoice is credited)
4. Receive a proposition for the premium domain with a price
5. Reject the proposition
6. Request a refund

Suggestions:

• On https://www.transip.eu/order-domain/check/ page, in search results make it clear which TLDs are premium.
• Inform customers about high premium domain registration fees.
• Inform customers about the ordering process: payment via PayPal -> proposition -> refund if rejected.
• Offer to use credit card instead of PayPal for premium domains, maybe.
• Don't charge until the proposal is accepted.