Are you allowed to build with any type of programming language such as GML, and etc?

As far as I know, yes, you can use any language or engine

You can use any language, as long as the final game is playable in a browser (desktop or mobile).

hello, are you using gml? If the answer is yes, I also use gml ... I wanted to know if you know how to use the coil page in gml, or how you can use the wed monetization from gml, I would appreciate your answer

I think you need to either create an Extension (I think that is what they are called in Game Maker) or have a snippet of JavaScript code call into GML when the Web Monetization state changes (https://help.yoyogames.com/hc/en-us/articles/360006636152-Execute-A-GML-Script-F...)