Key PointsNews of the Affirm network coming to Walmart self-checkout kiosks caused AFRM to gap up 15% on December 19.Signs of rising BNPL adoption is a bullish development for Affirm because the company has only scratched the surface in the U.S. retail market.Affirm's quarterly update in February could drastically sway the market's opinion one way or the other and set the tone for 2024.5 stocks we like better than AffirmBuy now, pay later (BNPL) leader Affirm Holdings Inc. NASDAQ: AFRM is having a 20% off s ...