JR東日本が新たなコード決済サービス「teppay（テッペイ）」を10月20日に開始する。PayPayなどが市場を席巻する中、なぜ今、JR東日本は新規参入に踏み切ったのか。「最後発」でのサービス開始となった裏事情や、急ピッチでの開発に成功した要因、競合サービスと比べた課題を徹底解説する。

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