https://www.reuters.com/article/us-paytm-ipo/indias-paytm-files-draft-papers-for-2-2-billion-ipo-idUSKBN2EM0G0 >BENGALURU (Reuters) -SoftBank-backed Indian digital payments startup Paytm has filed for an initial public offering (IPO) of up to 166 billion rupees ($2.23 billion), draft papers submitted to the country's market regulator showed on Friday.