First working version

src/main/java/ru/bitheaven/donpayinteg/config/Action.java

@@ -0,0 +1,31 @@
+package ru.bitheaven.donpayinteg.config;
+
+public class Action {
+    private int sum = 1;
+    private String message = "{username} donated";
+    private String command = "give @a dirt";
+
+    public int getSum() {
+        return sum;
+    }
+
+    public void setSum(int sum) {
+        this.sum = sum;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+
+    public String getCommand() {
+        return command;
+    }
+
+    public void setCommand(String command) {
+        this.command = command;
+    }
+}

src/main/java/ru/bitheaven/donpayinteg/config/Config.java

@@ -0,0 +1,36 @@
+package ru.bitheaven.donpayinteg.config;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class Config {
+    private String donpayToken = "<YOUR_TOKEN>";
+    private int lastDonate = 0;
+    private List<Action> actions = List.of(new Action());
+
+
+    public String getDonpayToken() {
+        return donpayToken;
+    }
+
+    public void setDonpayToken(String donpayToken) {
+        this.donpayToken = donpayToken;
+    }
+
+    public int getLastDonate() {
+        return lastDonate;
+    }
+
+    public void setLastDonate(int lastDonate) {
+        this.lastDonate = lastDonate;
+    }
+
+    public List<Action> getActions() {
+        return actions;
+    }
+
+    public void setActions(List<Action> actions) {
+        this.actions = actions;
+    }
+}
+

src/main/java/ru/bitheaven/donpayinteg/config/ConfigHandler.java

@@ -0,0 +1,58 @@
+package ru.bitheaven.donpayinteg.config;
+
+import net.fabricmc.loader.api.FabricLoader;
+import org.yaml.snakeyaml.DumperOptions;
+import org.yaml.snakeyaml.LoaderOptions;
+import org.yaml.snakeyaml.Yaml;
+
+import org.yaml.snakeyaml.constructor.Constructor;
+import org.yaml.snakeyaml.inspector.TagInspector;
+import ru.bitheaven.donpayinteg.DonPayInteg;
+
+import java.io.*;
+
+import static ru.bitheaven.donpayinteg.DonPayInteg.LOGGER;
+
+
+public class ConfigHandler {
+
+    private static final String PATH = FabricLoader.getInstance().getConfigDir().resolve(DonPayInteg.MOD_ID + ".yaml").toString();
+
+    public static void register() {
+        if(!new File(PATH).exists())
+            std();
+    }
+
+    public static Config load() {
+        LoaderOptions loaderOptions = new LoaderOptions();
+        loaderOptions.setTagInspector(tag -> tag.getClassName().equals(Config.class.getName()));
+        Yaml yaml = new Yaml(new Constructor(Config.class, loaderOptions));
+        Config config;
+        try {
+            config = yaml.load(new FileInputStream(PATH));
+        } catch (FileNotFoundException e) {
+            throw new RuntimeException(e);
+        }
+
+        return config;
+    }
+
+    public static void save(Config config) {
+        DumperOptions options = new DumperOptions();
+        options.setIndent(2);
+        options.setPrettyFlow(true);
+        options.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK);
+        Yaml yaml = new Yaml(options);
+
+        try {
+            yaml.dump(config, new FileWriter(PATH));
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public static void std() {
+        save(new Config());
+        LOGGER.info("Created new config file");
+    }
+}