First of all, you need to keep in mind that the “green check” verification on WhatsApp is different from the WhatsApp API verification. Even if you are approved to use the WhatsApp API, you may not necessarily obtain the verification.
To submit the request, you first need to meet a series of requirements. Generally, these requirements are to limit verification ONLY to companies with a very well-known brand. This process depends exclusively on WhatsApp, not Hoola.
You can find more details at this link.
Account Verification Requirements:
Have your business account approved by the WhatsApp API
Enable two-step authentication for the number
Verify the Facebook Business Manager of your account
It is recommended to be in Tier 2 (>10k Messages / 24 hours) or higher
Have a good number of press articles appearing on Google
Guide to Verify Your Account:
Go to your Facebook Business Settings --> WhatsApp Accounts --> WhatsApp Manager
On the left sidebar -> Account Tools -> Phone Numbers
Click on “Settings”
In the Profile -> Click on “Submit Request” where it says “Official Business Account”
Fill in the requested details and select “Submit”