Oh maybe you are using aCis which is one way directed. Internal or External.
Which means that either you run the server on 127.0.0.1 (localhost) or you run it by your external IP with portforwarding to your dhcp assigned 192.168...etc.
But I've figured it out on how to trick the system of course in a limited way up to 4 external PCs (free plan) using Hamachi. This can help you build the server testing with your friends before you host it on production!
If you need more information on how to do that don't hesitate to hit me up on PM.
bro don't get me wrong , i don't want to flame you but the title says [Share] Free DenArt... this is more of a freemium i guess anyway i wish you good luck ... stupid is not the one who ask is the one who give .
2 clicks away before start building something, ofc it will take some weeks for the final web app to be initialized .For more experienced users even less .There are hundreds of guides and documentation showing how to build trust and secure web payment apis. And don't forget in 2022 you have plenty of tools to help you build faster and more secure such as frameworks, libraries.