详细解答来了！

Group 1 - The Haikou City prize invoice activity has officially launched and will run until July 31, 2026 [1] - Consumers can participate by obtaining valid digital invoices from compliant tax merchants in eight designated industries [1][3] - The activity aims to maintain fairness and order in the prize invoice system and regulate invoice issuance behavior [1] Group 2 - The prize invoice activity features a dual mode of "instant win + large prize draw," with a maximum single invoice prize of 800 yuan [2] - Instant win prizes are set at seven levels: 5 yuan, 10 yuan, 20 yuan, 30 yuan, 50 yuan, 80 yuan, and 100 yuan, while large prizes are 200 yuan, 500 yuan, and 800 yuan [2] - Winnings will be distributed as electronic red envelopes to users' Cloud Flash Pay accounts, which can be used for purchases at participating merchants [2] Group 3 - To participate, consumers must complete four steps: spend at designated merchants, request a digital invoice in their real name, upload the invoice image via the Cloud Flash Pay app, and submit for an instant draw [3] - Each user can upload a maximum of 5 invoices per day, with a total limit of 120 invoices throughout the activity [3] - Certain types of tickets, such as air, train, and bus tickets, are excluded from this activity [3] Group 4 - Merchants have the right to refuse unreasonable invoice requests, such as requesting invoices without actual consumption or mismatched amounts [4] - For issues related to invoice uploading or verification, consumers can contact the tax service hotline [4] - Users of the HarmonyOS system may need to check their red envelope status through a specific path in the Cloud Flash Pay app if they cannot view subsidies [4]