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Employee benefit expense - Monthly average number of people employed by the Group (Details) - employee
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Employee benefit expense      
Processing and service delivery 38,256 34,163 33,174
Sales and marketing 5,993 5,400 5,272
Administration and overheads 7,226 6,468 6,142
Monthly average number of people employed by the Group 51,475 46,031 44,588