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Management of financial risk - Movements in the impairment loss allowance of contract assets of implementation service (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Movements in the impairment loss allowance of contract assets of implementation service      
Beginning of the year ¥ (82,340)    
End of the year (59,852) ¥ (82,340)  
Credit risk | Trade receivable and contract asset      
Movements in the impairment loss allowance of contract assets of implementation service      
Beginning of the year (125,318) (97,243)  
Additions of impairment loss (18,715) (71,061) ¥ (118,943)
Recovery of amounts written off previously (9,980)    
Write-off 37,156 42,986 67,644
Exchange difference (42)    
End of the year ¥ (116,899) ¥ (125,318) ¥ (97,243)