Daily WhatsApp Menu Broadcast System

I need a reliable way to send one short, text-only WhatsApp broadcast every day that shows my existing customers which menu items are available. I already have a clean, opt-in list of their WhatsApp numbers, so list building is not required; the entire focus is on compliant delivery.

Key points you should know
• Content: simple text message (no images, videos, or customer-name personalisation).
• Frequency: once per day, scheduled in advance if possible.
• Compliance: messages must be sent through a method that stays within WhatsApp’s anti-spam policies. I want zero risk of the account being blocked.
• Scale: several hundred recipients today, but the solution should let me grow.
• Management: an easy interface or script where I paste the daily menu, hit “send” (or schedule), and the system handles the rest—reporting delivered/failed numbers would be a plus.

I’m open to WhatsApp Business API, approved third-party platforms, or a custom tool, as long as it keeps the sending account healthy. When you reply, please outline the approach you recommend, any API or software costs I should expect, and the timeframe to get everything running.