For anyone who’s looking to do this with current versions of GB Studio, I just posted a demo on my Itch along with a writeup of exactly where to find the variables.
Viewing post in Proof of Concept: Call APIs from GB comments
Thank you for taking time to help community with API Calls via GB Studio on web. I have been googling this, i'm thinking to save game state on server for players that play on the web. Also I have seen your Depths of Europa (love the name, by the way!) and also saw your Kickstarter. I think you should try again, it is destined to be a success. There is also a way to create your own crowdfunding page where the 30 day countdown does not creep on you. You already have a following and people writing to you that they would be willing to back your project again so that might be also a possibility. Good luck on your journey and feel free to respond if you have any questions or just want to say hi ᵔ ᵕ ᵔ