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Accrued expenses and other current liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Accrued expenses and other current liabilities      
Accrued payroll ¥ 7,290,249 $ 998,760 ¥ 1,077,834
Tax payables 3,758,066 514,853 4,553,304
Payable to suppliers 115,793,122 15,863,592 109,331,440
Payable to external service providers 19,447,813 2,664,339 26,282,851
Payable to funding partner 50,365,126 6,899,995 79,295,374
Business deposits 5,593,315 766,281 6,282,315
Others 59,830,173 8,196,700 73,012,827
Total accrued expenses and other current liabilities ¥ 262,077,864 $ 35,904,520 ¥ 299,835,945