Note that this special relationship only likely applies to transactions that use the Amazon MasterCard on Amazon.com, and MasterCards issued by other companies still impose full rates.
Costco ran into this with American Express, though in retrospect the move to Visa seems like a worse move (more non-Costco Visa cards in circulation).
Costco ran into this with American Express, though in retrospect the move to Visa seems like a worse move (more non-Costco Visa cards in circulation).