How can I remove sandbox restrictions and move my application to production?

To take your application to production (and remove sandbox restrictions) you will have to get your business use case approved by WhatsApp and create a verified business profile for each of the phone numbers you intend to use for reaching users over WhatsApp. We are official WhatsApp partners and will carry out all these activities for you. Please write to us at sales@karix.io when you want a dedicated number for production use.