How to verify your business?
Business verification allows you to increase your sending limits. Without verification, you can send messages to up to 50 unique numbers per day. After verification, the limit increases to 1,000 unique numbers per day.
To have access to higher account tiers in your WhatsApp Business API account, you must complete Business Verification in the Business Manager. That is, you will have to provide Facebook with some documents proving the existence and legitimacy of your business.
Even though Business Verification is required by Meta for a company to have access to higher account tiers of the WhatsApp Business API, this process has no relation to WhatsApp.
For support with issues related to the Business Manager, contact Meta support directly through the "?" (help) icon in the bottom left corner of the page.