Max Levchin, co-founder of PayPal and chief executive officer of financial technology company Affirm, arrives at the Sun Valley Resort for the annual Allen & Company Sun Valley Conference, in Sun Valley, Idaho.Affirm shares plunged on Friday after the fintech company issued a weak forecast, and investors questioned CEO Max Levchin's plan to go big in 0% loans.The buy now, pay later lender said revenue this quarter will be between $815 million and$845 million. The midpoint of the range was short of the $841 ...