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Other payables and accruals (Tables)
 12 Months Ended
Dec. 31, 2022
Accrued Expenses And Other Liabilities [Abstract]  
Summary of detailed information about other payables and accruals
 
  
As of December 31,
 
 
  
2021
 
  
2022
 
 
  
HK$
 
  
HK$
 
Accruals and other payables
      91,594,587        114,718,709  
Contract liabilities (note)
      630,962        17,077,186  
    
 
 
     
 
 
  
       92,225,549        131,795,895