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Segment information and revenue - Revenue by timing of transfer of services (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers ¥ 4,357,462 ¥ 4,098,037 ¥ 3,309,113
At a point in time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 1,400,988 1,565,195 1,478,488
Over time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 2,956,474 2,532,842 1,830,625
Implementation      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 861,820 733,648 851,856
Implementation | At a point in time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 36,266    
Implementation | Over time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 825,554 733,648 851,856
Operation support services      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 1,140,727 1,097,719 1,061,445
Operation support services | At a point in time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 376,784 399,523 453,720
Operation support services | Over time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 763,943 698,196 607,725
Business origination services      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 383,723 450,597 605,733
Business origination services | At a point in time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 383,723 450,597 605,733
Risk management services      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 414,849 534,071 362,530
Risk management services | At a point in time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 414,849 534,071 362,530
Cloud services platform      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 1,315,819 1,050,179 314,338
Cloud services platform | Over time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 1,315,819 1,050,179 314,338
Post implementation support services      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 50,983 49,447 55,678
Post implementation support services | Over time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 50,983 49,447 55,678
Others      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 189,541 182,376 57,533
Others | At a point in time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers 189,366 181,004 56,505
Others | Over time      
Disaggregation of revenue from contracts with customers      
Revenue from contracts with customers ¥ 175 ¥ 1,372 ¥ 1,028