STEP 1 - Business & Facebook Account Details
In the first step, you need to share your details about your Facebook Business account and your website here. We will apply for Whatsapp API approval on your behalf.
Facebook will verify your website and approve or reject your application, depending on whether or not your business meets the WhatsApp Terms of Service.
WhatsApp only allows certain types of businesses to request API access. You can read their policy to see if you are eligible here.
You should also check if your display name and phone number adheres to Whatsapp's guidelines or not here and here.
STEP 2
We'll reach out to you in some time on your personal Whatsapp number provided by you in the form mentioned in STEP 1 to inform you about a request that you'll need to approve in your Facebook business manager account.
STEP 3
You will need to verify the ownership of the phone number using an OTP / verification code sent to your number via SMS. We will again reach out to you during this step.
The overall process should take anywhere from 2-5 business days.