By Elizabeth Culliford and Katie Paul (Reuters) -WhatsApp is introducing free cloud-based API services in a push to get more businesses using the app, Meta Platforms CEO Mark Zuckerberg announced at the company’s messaging event on Thursday. The messaging service, which has increasingly courted business users, is one of several platforms where Facebook-owner Meta has launched more shopping and business-focused features. Zuckerberg, speaking at Meta’s “Conversations” event, said the offering would mean “any business or developer can easily access our service, build directly on top of WhatsApp t…