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Accrued expenses (Details) - USD ($)
Mar. 31, 2023
Mar. 31, 2022
Accrued expenses    
Accrued payroll $ 844,331 $ 480,404
Accrued rental fee 2,265 77,777
Accrued promotion fee 9,368 51,252
Audit fee payable   20,000
Accrued Interest 202,405 219,097
Other 334 13,020
Total $ 1,058,703 $ 861,550