In order for WhatsApp campaigns to be sent, you will need to set up a cron job to run on some intervals, to send thous campaigns to WhatsApp.
It needs to be done via cron job because not all messages from the campaign are sent instantly.
<https://YOURWEBSITE.COM/webhook/wpbox/sendschuduledmessages>
https://console.cron-job.org/ is a website for running cron jobs for free.
You can create a cron job easily, and monitor it.
To set up a cron job in cPanel, you can follow these steps:
Common Settings: You can choose from common time intervals. We suggest to run the cron job every 3-5 minutes.
Command: In this field, you specify the command or script you want to run as a cron job. In your case it is
<https://YOURWEBSITE.COM/webhook/wpbox/sendschuduledmessages>
Email: You can enter an email address if you want to receive notifications about the cron job's execution. Leave it blank if you don't want to receive emails.
Make sure you replace YOURWEBSITE.COM with your actual website.