Shift4 shares surge 11% on earnings beat as fintech stocks climb on results and upgrades / Fintech stocks such as Affirm, PayPal plunge on concern Trump tariffs will hurt consumer spending / Meet the UK and Irelands fastest-growing fintechs by revenue / Fintech stocks plummet as Wall Street worries about consumer spending, credit / Morgan Stanley upgrades this fintech stock, sees almost 30% upside from here