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So I defined a property in `gradle.properties` file and got a reference in the `build.gradle.kts` file by declaring a global property:
`val api_key: String by project`. I want to use `api_key` in my `Main.kt`, but I can't seem to figure out how to gain access. Searched on StackOverflow and all the results were android related. Can anyone help?

Your main program is unrelated to Gradle. What about if you build for production? Gradle won't be anywhere in sight when your program is run then. You should probably put config files for your application somewhere else.

In the application source code / resources folder

<https://grokonez.com/kotlin/kotlin-properties-read-write-properties-file-properties-xml-file>