LONDON--(BUSINESS WIRE)--Viber, one of the world’s leading messaging apps with more than 606 million users, is now open for business offering a number of opportunities to partners worldwide, including service messages and promotional sticker packs. The introduction of a new A2P (app to person) technology allows businesses to send informative and personal messages to their customers on Viber. This innovative API enables telecommunication companies who deliver service messages on behalf of busine