PayPal order creation divided every amount by 100 before sending it,
regardless of currency. JPY has no minor unit, so `convertToSmallestCurrencyUnit`
stores it unscaled and dividing corrupted it: a JPY 10000 event asked PayPal
to collect 100.
Use the same zero-decimal-aware conversion that the price input and
`formatPrice` already use, so the amount charged matches the amount stored
and displayed. Currencies with minor units are unaffected — among PayPal's
supported currencies only JPY is both zero-decimal and supported, and the
added tests pin USD, EUR, HUF and TWD to their existing behaviour.
shafi-VM
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