Try to give name card

src/main/java/emu/grasscutter/data/common/RewardItemData.java

+package emu.grasscutter.data.common;
+
+public class RewardItemData {
+    private int ItemId;
+    private int ItemCount;
+
+    public int getItemId() {
+        return ItemId;
+    }
+
+    public void setItemId(int itemId) {
+        ItemId = itemId;
+    }
+
+    public int getItemCount() {
+        return ItemCount;
+    }
+
+    public void setItemCount(int itemCount) {
+        ItemCount = itemCount;
+    }
+}

src/main/java/emu/grasscutter/data/def/RewardData.java

+package emu.grasscutter.data.def;
+
+import java.util.List;
+
+import emu.grasscutter.data.GenshinResource;
+import emu.grasscutter.data.ResourceType;
+import emu.grasscutter.data.common.RewardItemData;
+
+@ResourceType(name = "RewardExcelConfigData.json")
+public class RewardData extends GenshinResource {
+    public int RewardId;
+    public List<RewardItemData> RewardItemList;
+
+    @Override
+	public int getId() {
+		return RewardId;
+	}
+
+    public List<RewardItemData> getRewardItemList() {
+        return RewardItemList;
+    }
+
+    @Override
+    public void onLoad() {
+
+    }
+}

src/main/java/emu/grasscutter/game/avatar/GenshinAvatar.java

@@ -433,6 +433,7 @@ public class GenshinAvatar {
 
 		// Fetters
 		this.setFetterList(data.getFetters());
+		this.setNameCardRewardId(data.getNameCardRewardId());
 		
 		// Get hp percent, set to 100% if none
 		float hpPercent = this.getFightProperty(FightProperty.FIGHT_PROP_MAX_HP) <= 0 ? 1f : this.getFightProperty(FightProperty.FIGHT_PROP_CUR_HP) / this.getFightProperty(FightProperty.FIGHT_PROP_MAX_HP);

src/main/java/emu/grasscutter/server/packet/recv/HandlerAvatarFetterLevelRewardReq.java

 package emu.grasscutter.server.packet.recv;
 
+import emu.grasscutter.Grasscutter;
+import emu.grasscutter.data.GenshinData;
+import emu.grasscutter.data.def.RewardData;
+import emu.grasscutter.game.inventory.GenshinItem;
+import emu.grasscutter.game.props.ActionReason;
 import emu.grasscutter.net.packet.Opcodes;
 import emu.grasscutter.net.packet.PacketOpcodes;
 import emu.grasscutter.net.proto.AvatarFetterLevelRewardReqOuterClass.AvatarFetterLevelRewardReq;
 import emu.grasscutter.server.game.GameSession;
 import emu.grasscutter.server.packet.send.PacketAvatarFetterLevelRewardRsp;
+import emu.grasscutter.server.packet.send.PacketItemAddHintNotify;
+import emu.grasscutter.server.packet.send.PacketUnlockNameCardNotify;
 import emu.grasscutter.net.packet.PacketHandler;
 
 @Opcodes(PacketOpcodes.AvatarFetterLevelRewardReq)
@@ -24,8 +31,18 @@ public class HandlerAvatarFetterLevelRewardReq extends PacketHandler {
                 .getAvatarByGuid(avatarGuid)
                 .getNameCardRewardId();
 
-            // Here need to send the packets, I am not at all clear ah!
+            RewardData card = GenshinData.getRewardDataMap().get(rewardId);
+            int cardId = card.getRewardItemList().get(0).getItemId();
 
+            if (session.getPlayer().getNameCardList().contains(cardId)) {
+                // Already got divorce certificate.
+                session.send(new PacketAvatarFetterLevelRewardRsp(req.getAvatarGuid(), req.getFetterLevel()));
+                return;
+            }
+
+            GenshinItem item = new GenshinItem(cardId);
+            session.getPlayer().sendPacket(new PacketItemAddHintNotify(item, ActionReason.FetterLevelReward));
+            session.send(new PacketUnlockNameCardNotify(cardId));
             session.send(new PacketAvatarFetterLevelRewardRsp(avatarGuid, req.getFetterLevel(), rewardId));
         }
 	}