For Walmart, buy now, pay later (BNPL) may offer the means by which the retail giant pushes even further into financial services and toward super app status.And the low-hanging fruit for BNPL may be found at checkout for groceries and healthcare.The move, we note, also sets the stage for competition — or perhaps what might be termed a complementation — with Affirm, already a payment option entrenched with Walmart.As had been widely reported Tuesday (April 23), initially by CNBC, One, the FinTech that is maj ...