Start with permission
WhatsApp’s business rules require that people agree to receive messages from your business on WhatsApp before you message them first. Agreement can be collected on a form, at checkout, at the counter or when someone messages you, but you should be able to show when and how.
A list bought from a third party, or numbers copied from a directory, is not permission. Those are the campaigns that produce blocks and reports.
Use the official platform and approved templates
Business-started messages sent through the WhatsApp Business Platform use templates that Meta has reviewed. Tools that automate a normal WhatsApp account work against WhatsApp’s terms, and accounts used that way are routinely banned.
Choose the template category honestly: marketing for promotions, utility for things the customer expects such as order updates, authentication for codes.
Protect your quality rating
Meta watches how recipients react. When many people block or report your number, its quality rating falls and so can the number of customers you are allowed to message each day. New numbers start with a low daily limit that rises while quality stays good.
Send relevant messages, not frequent ones. Start with a small batch, read the results and then widen the audience.
Make opting out easy
End marketing messages with a clear way to stop, such as “Reply STOP”, and honour it at once. ClickCard keeps an opt-out list and skips those numbers in later campaigns.
It is better for someone to opt out than to block you, because blocks are what damage the rating.
Clean the list and check before sending
Remove duplicates and invalid numbers, test the template on your own phone and be ready to answer replies. The free checklist and number cleaner on this site cover these steps.