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ACCOUNTS RECEIVABLE, NET (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounts Receivable [Abstract] |  |  |
Accounts receivable | $ 3,523,543 | $ 1,584,448 |
Less: provision for doubtful accounts | (1,475,983) | (1,121,115) |
Accounts receivable, net | 2,047,560 | 463,333 |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at the beginning of the year | 1,121,115 | 874,355 | $ 0
Additions | 391,189 | 92,009 | 946,590
Write-off | (86,170) | 0 | (51,418)
Foreign exchange | 49,849 | 154,751 | (20,817)
Balance at the end of the year | $ 1,475,983 | $ 1,121,115 | $ 874,355

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