What are the constrains of third-party app development for the app ?

So I am looking for a document, tutorial, guide that shows constrains for developing a software for the game. Any advices will be welcome.

Anything that performs more than one action per click / press is not allowed.

Some documentation:
https://www.pathofexile.com/developer/docs/index#policy

Browse for ideas/inspiration:
https://github.com/topics/path-of-exile

On the top of my head i'd say most addons utilize third party scripting laguages/tools likee AHK (autohotkey), autoit etc, atleast if there's any UI component.

Haven't tried or really researched modding POE myself since my first impression was that it's a somewhat narrow scope in regards to what you can do while not breaking TOS.
Not very accessible for developing simple/smaller mods for personal or niche use comparing to WoW for example.

I've mainly got experience from M&B2: Bannerlord - C# code and xml/xslt-editing. Also some basic WoW-stuff - Lua and scripting under other addons/mods.

The difference for those games is the inherent mod-support with some official but alot of unofficial documentation as well as a wealth of mods to learn from.

Maybe I'm wrong about POE-modding, but that's my impression.

Look for documentation or tutorials outlining constraints specific to your game's software development. I've faced similar challenges in the past, and finding resources tailored to your needs can make a world of difference.

Consider exploring Xano Backend for rapid app development. I encountered hurdles at a startup once, and leveraging xano api significantly streamlined our development process. It's worth checking out for your project's needs.