The primary difference between a WhatsApp Verified Business and a WhatsApp Official Verified Business is that, when sending a message from a WhatsApp Official Verified Business, the outbound message is labelled as being sent from the name of that business (rather than a provisioned/registered phone number).
Users will see a green check mark next to the name of the business when they receive such messages, informing them that the business is an official verified business on WhatsApp.
A business account on WhatsApp can either be listed as an Official business account or a regular Business account. A business can't request or pay to turn a business account into an official business account. At this time, only certain business accounts are listed as official business accounts. Listing a business as an official business account is based on a variety of factors, such as whether the brand is notable.
Following a series of client rejections, Sinch has requested further official guidance from WhatsApp regarding business verification. WhatsApp have committed to refine and publish their approval criteria and we will provide a link to this here as soon as we receive it.
The business can submit a request to Sinch to have Meta review/approve the “Official Verified Business Account” after their phone number has been provisioned.