超音波式指紋認証のスマホならハンドペイシステムをアプリ開発すれば対応可能かも知れません。

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https://www.google.com/search?q=iPhone+Android+%E8%B6%85%E9%9F%B3%E6%B3%A2+%E8%AA%8D%E8%A8%BC&sca_esv=570249222&source=hp&ei=lp4bZYWhEtO12roPgaWqiAY&oq=iPhone+Android+%E8%B6%85%E9%9F%B3%E6%B3%A2+%E8%AA%8D%E8%A8%BC&gs_lp=EhFtb2JpbGUtZ3dzLXdpei1ocCIfaVBob25lIEFuZHJvaWQg6LaF6Z-z5rOiIOiqjeiovDIFEAAYogQyBRAAGKIEMgUQABiiBDIFEAAYogRI2O4CUKEiWNXoAnAJeACQAQCYAf0DoAHrJ6oBDTI3LjE2LjAuMS4wLjG4AQPIAQD4AQGoAg_CAgoQABgDGI8BGOoCwgINEAAYBBiABBixAxiDAcICBxAAGAQYgATCAggQABiABBixA8ICCxAAGIAEGLEDGIMBwgIFEAAYgATCAgsQABiKBRixAxiDAcICChAAGAQYgAQYsQPCAgYQABgEGB7CAggQABgFGAQYHsICCBAAGIkFGKIEwgIIEAAYCBgEGB7CAgUQIRigAQ&sclient=mobile-gws-wiz-hp#ip=1