diff --git a/pom.xml b/pom.xml
index 200d373..2e51354 100644
--- a/pom.xml
+++ b/pom.xml
@@ -20,6 +20,10 @@
             <id>spigot-repo</id>
             <url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
         </repository>
+        <repository>
+            <id>jitpack.io</id>
+            <url>https://jitpack.io</url>
+        </repository>
     </repositories>
 
     <dependencies>
diff --git a/src/main/java/dev/drawethree/ultrabackpacks/api/event/BackpackSellEvent.java b/src/main/java/dev/drawethree/ultrabackpacks/api/event/BackpackSellEvent.java
index 502b4e7..2c14977 100644
--- a/src/main/java/dev/drawethree/ultrabackpacks/api/event/BackpackSellEvent.java
+++ b/src/main/java/dev/drawethree/ultrabackpacks/api/event/BackpackSellEvent.java
@@ -37,4 +37,8 @@ public void setMoneyToDeposit(double moneyToDeposit) {
 	public Player getPlayer() {
 		return player;
 	}
+
+	public double getMoneyToDeposit() {
+		return moneyToDeposit;
+	}
 }
diff --git a/src/main/java/dev/drawethree/ultrabackpacks/api/model/backpack/IBackpackData.java b/src/main/java/dev/drawethree/ultrabackpacks/api/model/backpack/IBackpackData.java
index b7031de..a1a6a11 100644
--- a/src/main/java/dev/drawethree/ultrabackpacks/api/model/backpack/IBackpackData.java
+++ b/src/main/java/dev/drawethree/ultrabackpacks/api/model/backpack/IBackpackData.java
@@ -4,7 +4,18 @@
 
 public interface IBackpackData {
 
+	/**
+	 * Returns Map of enchants that player has in his backpack.
+	 * Key - Id of enchant
+	 * Value - Level of enchant
+	 * @return Map of enchants belonging to player
+	 */
 	Map<Integer, Long> getEnchants();
 
+	/**
+	 * Returns Map
+	 * Key - {@link CompMaterial}
+	 * @return Map of backpack contents
+	 */
 	Map<?, Long> getItems();
 }
diff --git a/src/main/java/dev/drawethree/ultrabackpacks/api/service/BackendAPI.java b/src/main/java/dev/drawethree/ultrabackpacks/api/service/BackendAPI.java
index 7d751f4..e2dcd08 100644
--- a/src/main/java/dev/drawethree/ultrabackpacks/api/service/BackendAPI.java
+++ b/src/main/java/dev/drawethree/ultrabackpacks/api/service/BackendAPI.java
@@ -10,6 +10,39 @@ public abstract class BackendAPI {
 
 	private static BackendAPI implementation;
 
+	/**
+	 * Returns true if player has backpack in his inventory
+	 *
+	 * @param player Player
+	 * @return true if player has backpack in his inventory
+	 */
+
+	public abstract boolean hasBackpack(Player player);
+
+	/**
+	 * Get player BackpackData
+	 *
+	 * @param player Player
+	 * @return BackpackData.class
+	 */
+	public abstract IBackpackData getBackpackData(Player player);
+
+	/**
+	 * Sells the contents of player backpack.
+	 *
+	 * @param player  Player
+	 * @param sellAll If true, sells whole backpack. If false, sells only x amount of items based on AutoSell backpack enchant.
+	 */
+	public abstract void sellBackpack(Player player, boolean sellAll);
+
+	/**
+	 * Handles the specified broken blocks and tries to add them into backpack
+	 *
+	 * @param player Player
+	 * @param blocks List of blocks that were broken and should be added to backpack
+	 */
+	public abstract void handleBlocksBroken(Player player, List<Block> blocks);
+
 	public static void setImplementation(BackendAPI implementation) {
 		BackendAPI.implementation = implementation;
 	}
@@ -21,12 +54,4 @@ public static BackendAPI getImplementation() {
 
 		return implementation;
 	}
-
-	public abstract boolean hasBackpack(Player player);
-
-	public abstract IBackpackData getBackpackData(Player player);
-
-	public abstract void sellBackpack(Player player, boolean sellAll);
-
-	public abstract void handleBlocksBroken(Player player, List<Block> blocks);
 }