Amazon is investigating claims that its employees accepted bribes in exchange for leaking confidential sales data.
Independent sellers were also allowed to delete negative reviews and restore banned accounts for payments of between $80 (£61; €69) and $2,000, according to allegations in the Wall Street Journal.
The Journal said the practice was particularly “pronounced in China”.
Amazon said it had “zero tolerance” for abuse of its systems and that it was conducting a “through investigation”.
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