https://www.reuters.com/article/us-india-budget-tax-ecommerce/amazon-flipkart-challenge-new-indian-tax-on-online-sellers-idUSKBN2082BZ >Amazon and Walmart's Flipkart are among online retailers demanding that India scale back a proposed tax on third-party sellers on their platforms, saying the burden of compliance will hurt the fledgling industry, according to a document seen by Reuters.