This post is from the Activity iPhone Duo UIKit Q&A.
"What are the financial transaction integrity risks on Apple Duo during fold transitions?
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Is there a risk of double-charging if fold occurs during payment processing?
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If a user confirms payment and immediately folds the device, how is the transaction status handled? Can we guarantee the payment was processed only once?
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Can a failed payment retry mechanism cause duplicate payment attempts if fold occurs during the retry logic?
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If a refund or payment reversal is initiated and fold occurs during the operation, could the transaction be interrupted or processed twice?"