Stay informed with free updatesSimply sign up to the Fintech myFT Digest -- delivered directly to your inbox.Shares in CAB Payments plunged as much as 74 per cent on Tuesday after the fintech warned on profits just months after a London listing that was hailed as a rare bright spot for the struggling UK market.The company, which says it specialises in helping businesses make payments to “hard-to-reach markets” and has more than 490 customers, slashed its forecast for revenues this year by almost a fifth.A steep drop in the Nigerian...