American Express will grow its lending business through a partnership with GreenSky, provider of a proprietary platform that delivers instant financing at the point of sale. Since 2012, GreenSky has opened $13 billion in installment credit loans to 1.8 million consumers at more than 13,000 U.S. home improvement merchants and elective healthcare practices. Those loans are originated and owned by eight regional banks in the U.S. At no point are loans on GreenSky’s balance sheet. Neither is GreenSky a loan broker. It receives a transaction fee from merchants, a loan servicing fee from the lende...