Group 1 - The article provides a detailed guide on how to issue electronic invoices for train tickets purchased through the railway 12306 platform, including steps for both passengers and purchasers [3][4]. - It outlines the process of obtaining a "QR Code Invoice" by first applying for it at the ticket window or automatic ticket machine using valid identification [3]. - The article emphasizes the need for identity verification through the railway 12306 App to complete the invoice issuance process [3][4]. Group 2 - The article mentions that if the ticket purchaser is different from the passenger, the purchaser must provide the passenger's identification or order number for verification [3]. - It details the steps for completing the necessary information and verifying identity to successfully issue the electronic invoice [4]. - The article also includes a reminder for users to contact railway 12306 customer service in case of any issues during the invoice issuance process [4]. Group 3 - The article includes a section on housing loan early repayment, stating that individuals cannot continue to enjoy the housing loan interest special deduction after early repayment [10]. - It explains the calculation period for the deduction, which lasts from the month the loan repayment starts until the loan is fully repaid, with a maximum duration of 240 months [10]. - The article provides instructions on how to modify the actual loan term in the personal income tax APP to reflect the early repayment [10].