PayPalAmount.php

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<?php
 
class PayPalAmount extends Amount implements StagingHelper {
 
    public function stage( GatewayType $adapter, $normalized, &$stagedData ) {
        $stagedData[ 'amount' ] = static::round( $normalized[ 'amount' ], $normalized[ 'currency' ] );
    }
 
    public static function is_fractional_currency( $currency_code ) {
        // cause this function only used for paypal, no need to check more than paypal supported currencies
        // https://developer.paypal.com/braintree/docs/reference/general/currencies
        $non_fractional_currencies = [ 'JPY', 'HUF', 'TWD' ];
 
        if ( in_array( strtoupper( $currency_code ), $non_fractional_currencies ) ) {
            return false;
        }
        return true;
    }
}