No Apple Pay option in Apple Store App?

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I can't believe I don't have the option to use Apple Pay in the Apple Store app. I have two cards registered on my iPhone 6. What's the deal?

 

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Found the answer. From their support page:

https://support.apple.com/en-us/HT201469
"Discover support for Apple Pay payments within apps is coming soon."

Discover was the only card i had set up in Apple Pay. Once I added USBank, the option to use Apple Pay appeared.