After 7: 00 every activity day (because 12306 should not sell tickets before 7: 00), enter official website or the mobile APP to select the train ticket you want to buy, choose to pay with UnionPay when paying, then enter the card number at the beginning of your credit card 62, and enter relevant information according to the prompt to confirm the payment. If there are still places on that day, it will show that you have enjoyed the discount, and then you can fill in the mobile phone verification code and other related information.