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Segment information and revenue - Revenue by timing of transfer of services (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers ¥ 2,248,103 ¥ 3,521,591 ¥ 4,357,462
At a point in time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 519,378 806,029 1,400,988
Over time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 1,728,725 2,715,562 2,956,474
Implementation      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 664,127 834,620 861,820
Implementation | At a point in time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 28,450 37,804 36,266
Implementation | Over time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 635,677 796,816 825,554
Operation support services      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 549,273 861,056 1,140,727
Operation support services | At a point in time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 143,377 240,366 376,784
Operation support services | Over time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 405,896 620,690 763,943
Business origination services      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 30,078 132,112 383,723
Business origination services | At a point in time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 30,078 132,112 383,723
Risk management services      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 247,828 320,462 414,849
Risk management services | At a point in time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 247,828 320,462 414,849
Cloud services platform      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 618,088 1,245,952 1,315,819
Cloud services platform | Over time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 618,088 1,245,952 1,315,819
Post implementation support services      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 69,064 52,012 50,983
Post implementation support services | Over time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 69,064 52,012 50,983
Others      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 69,645 75,377 189,541
Others | At a point in time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers ¥ 69,645 75,285 189,366
Others | Over time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers   ¥ 92 ¥ 175