Got the answer from the person who make modification on that private forum.
The price is $100.
His system is like this:
KMRS server -> "Our API server" -> whatsapp API Server, then whatsapp server send the notification
"Our API server": we have to have a physical windows computer at home (must ON all the time) or renting a VPS server with windows 10 installed.
This is a crappy system, I don't like it at all.
1. If you use your own PC at home that means you waste electricity. What if the electricity fails, we must buy UPS. What if UPS battery dies before electricity comes back ON, we must buy a generator.
2. If you rent VPS with windows operating system, VPS is not cheap with big storage (windows OS minimum needs 20GB), big RAM, big CPU power, plus you have to buy windows 10 License. The monthly VPS fee will be the same as the Wassenger service.
3. You have to pay $100 for his modification.
The good news is, I found where to inject the command to send whatsapp notification using traditional whatsapp API.
If this is successful, then the whatsapp sending will be free, don't have to pay wassenger service. No need to ask restaurant owner and drivers to register their phone with callmebot.
This will be the progress for today. Just the finding, not actually working on the coding yet.
-Arrocy-