Comma-separated list of custom Android modules (which must have been built in the Android export templates) using their Java package path, e.g. [code]org/godotengine/org/GodotPaymentV3,org/godotengine/godot/MyCustomSingleton"[/code].
ERR_FAIL_COND_V_MSG(sdk_path=="",ERR_UNCONFIGURED,"Android SDK path must be configured in Editor Settings at 'export/android/custom_build_sdk_path'.");
_update_custom_build_project();
OS::get_singleton()->set_environment("ANDROID_HOME",sdk_path);//set and overwrite if required