Why am I not seeing the ApplePay button when I checkout?

To see the ApplePay button, you must use Safari on iOS 10 or MacOS Sierra on one of the following devices:

• iPhone (SE, 6, 6 Plus, or newer)
• iPad (Pro, Air 2, mini 3, or newer)
• Apple Watch
• MacBook (Late 2009 or newer)
• MacBook Pro (Mid 2010 or newer)
• MacBook Air (Late 2010 or newer)
• Mac mini (Midi 2010 or newer)
• iMac (Late 2009 or newer)
• Mac Pro (Mid 2010 or newer)