diff --git a/apps/backend/src/lib/notifications.ts b/apps/backend/src/lib/notifications.ts
new file mode 100644
index 0000000..afdfb3d
--- /dev/null
+++ b/apps/backend/src/lib/notifications.ts
@@ -0,0 +1,573 @@
+import prisma from "./prisma";
+import { lineClient } from "./lineClient";
+
+export async function sendOrderCreatedNotification(orderId: number) {
+  try {
+    const order = await prisma.order.findUnique({
+      where: { id: orderId },
+      include: { items: true, customer: true }
+    });
+
+    if (!order || !order.customer?.lineUserId) {
+      console.log(`[Notification] Order #${orderId} has no associated lineUserId or does not exist.`);
+      return;
+    }
+
+    const settings = await prisma.storeSettings.findFirst();
+    const bankName = settings?.bankName || "KASIKORNBANK (KBANK)";
+    const bankAccountNumber = settings?.bankAccountNumber || "012-3-45678-9";
+    const bankAccountName = settings?.bankAccountName || "HomAroma Co., Ltd.";
+
+    const itemContents = order.items.map(item => ({
+      type: "box",
+      layout: "horizontal",
+      contents: [
+        {
+          type: "text",
+          text: `${item.productName}${item.variantSize ? ` (${item.variantSize})` : ""} x ${item.quantity}`,
+          size: "sm",
+          color: "#333333",
+          flex: 3,
+          wrap: true
+        },
+        {
+          type: "text",
+          text: `฿${item.priceAtPurchase * item.quantity}`,
+          size: "sm",
+          color: "#1C3F3A",
+          weight: "bold",
+          align: "end",
+          flex: 1
+        }
+      ]
+    }));
+
+    const flexMessage: any = {
+      type: "flex",
+      altText: `HomAroma: คำสั่งซื้อ #${order.id} ได้รับแล้ว กรุณาชำระเงิน`,
+      contents: {
+        type: "bubble",
+        header: {
+          type: "box",
+          layout: "vertical",
+          backgroundColor: "#1C3F3A",
+          contents: [
+            {
+              type: "text",
+              text: "HomAroma Official",
+              color: "#D4B16A",
+              weight: "bold",
+              size: "xs"
+            },
+            {
+              type: "text",
+              text: "ได้รับคำสั่งซื้อของคุณแล้ว",
+              color: "#FFFFFF",
+              weight: "bold",
+              size: "md",
+              margin: "sm"
+            }
+          ]
+        },
+        body: {
+          type: "box",
+          layout: "vertical",
+          contents: [
+            {
+              type: "text",
+              text: `หมายเลขออเดอร์: #HM-${order.id}`,
+              weight: "bold",
+              size: "sm",
+              color: "#333333"
+            },
+            {
+              type: "separator",
+              margin: "md"
+            },
+            {
+              type: "box",
+              layout: "vertical",
+              margin: "md",
+              spacing: "sm",
+              contents: [
+                {
+                  type: "box",
+                  layout: "horizontal",
+                  contents: [
+                    {
+                      type: "text",
+                      text: "รายการสินค้า",
+                      size: "xs",
+                      color: "#888888",
+                      flex: 3
+                    },
+                    {
+                      type: "text",
+                      text: "ยอดรวม",
+                      size: "xs",
+                      color: "#888888",
+                      align: "end",
+                      flex: 1
+                    }
+                  ]
+                },
+                ...itemContents
+              ]
+            },
+            {
+              type: "separator",
+              margin: "md"
+            },
+            {
+              type: "box",
+              layout: "horizontal",
+              margin: "md",
+              contents: [
+                {
+                  type: "text",
+                  text: "ยอดชำระสุทธิ (รวมค่าส่ง)",
+                  size: "sm",
+                  color: "#555555",
+                  weight: "bold",
+                  flex: 3
+                },
+                {
+                  type: "text",
+                  text: `฿${order.totalAmount}`,
+                  size: "sm",
+                  color: "#1C3F3A",
+                  weight: "bold",
+                  align: "end",
+                  flex: 1
+                }
+              ]
+            },
+            {
+              type: "separator",
+              margin: "md"
+            },
+            {
+              type: "box",
+              layout: "vertical",
+              margin: "md",
+              contents: [
+                {
+                  type: "text",
+                  text: "🏦 ช่องทางการชำระเงินโอนเงิน:",
+                  size: "xs",
+                  color: "#555555",
+                  weight: "bold"
+                },
+                {
+                  type: "text",
+                  text: `${bankName} (${bankAccountNumber})`,
+                  size: "xs",
+                  color: "#1C3F3A",
+                  margin: "xs",
+                  weight: "bold"
+                },
+                {
+                  type: "text",
+                  text: `ชื่อบัญชี: ${bankAccountName}`,
+                  size: "xs",
+                  color: "#555555"
+                }
+              ]
+            }
+          ]
+        },
+        footer: {
+          type: "box",
+          layout: "vertical",
+          spacing: "sm",
+          contents: [
+            {
+              type: "button",
+              style: "primary",
+              color: "#1C3F3A",
+              action: {
+                "type": "uri",
+                "label": "แนบสลิปชำระเงิน",
+                "uri": `https://spa.homaroma.shop/order-success?id=${order.id}`
+              }
+            },
+            {
+              type: "button",
+              style: "link",
+              height: "sm",
+              action: {
+                "type": "uri",
+                "label": "ติดตามสถานะออเดอร์",
+                "uri": "https://spa.homaroma.shop/track-order"
+              }
+            }
+          ]
+        }
+      }
+    };
+
+    await lineClient.pushMessage({
+      to: order.customer.lineUserId,
+      messages: [flexMessage]
+    });
+    console.log(`[Notification] OrderCreated notification sent for Order #${orderId}`);
+  } catch (err) {
+    console.error(`[Notification] Failed to send OrderCreated notification for Order #${orderId}:`, err);
+  }
+}
+
+export async function sendPaymentConfirmedNotification(orderId: number) {
+  try {
+    const order = await prisma.order.findUnique({
+      where: { id: orderId },
+      include: { customer: true }
+    });
+
+    if (!order || !order.customer?.lineUserId) {
+      console.log(`[Notification] Order #${orderId} has no associated lineUserId or does not exist.`);
+      return;
+    }
+
+    const flexMessage: any = {
+      type: "flex",
+      altText: "HomAroma: ได้รับการชำระเงินเรียบร้อยแล้ว",
+      contents: {
+        type: "bubble",
+        body: {
+          type: "box",
+          layout: "vertical",
+          contents: [
+            {
+              type: "box",
+              layout: "vertical",
+              alignItems: "center",
+              contents: [
+                {
+                  type: "text",
+                  text: "✨ ชำระเงินสำเร็จ ✨",
+                  weight: "bold",
+                  size: "xl",
+                  color: "#1C3F3A"
+                },
+                {
+                  type: "text",
+                  text: `ขอขอบคุณสำหรับคำสั่งซื้อออเดอร์ #HM-${order.id}`,
+                  size: "xs",
+                  color: "#888888",
+                  margin: "xs"
+                }
+              ]
+            },
+            {
+              type: "box",
+              layout: "vertical",
+              backgroundColor: "#F4F6F5",
+              margin: "lg",
+              paddingAll: "md",
+              cornerRadius: "md",
+              contents: [
+                {
+                  type: "box",
+                  layout: "horizontal",
+                  contents: [
+                    {
+                      type: "text",
+                      text: "ได้รับแต้มครั้งนี้",
+                      size: "sm",
+                      color: "#555555"
+                    },
+                    {
+                      type: "text",
+                      text: `+${order.pointsEarned} แต้ม`,
+                      weight: "bold",
+                      size: "sm",
+                      color: "#1C3F3A",
+                      align: "end"
+                    }
+                  ]
+                },
+                {
+                  type: "box",
+                  layout: "horizontal",
+                  margin: "xs",
+                  contents: [
+                    {
+                      type: "text",
+                      text: "แต้มสะสมรวมล่าสุด",
+                      size: "sm",
+                      color: "#555555"
+                    },
+                    {
+                      type: "text",
+                      text: `${order.customer.points} แต้ม`,
+                      weight: "bold",
+                      size: "sm",
+                      color: "#D4B16A",
+                      align: "end"
+                    }
+                  ]
+                }
+              ]
+            }
+          ]
+        },
+        footer: {
+          type: "box",
+          layout: "vertical",
+          contents: [
+            {
+              type: "button",
+              style: "primary",
+              color: "#1C3F3A",
+              action: {
+                "type": "uri",
+                "label": "แลกของรางวัล & คูปองสะสม",
+                "uri": "https://spa.homaroma.shop/profile"
+              }
+            }
+          ]
+        }
+      }
+    };
+
+    await lineClient.pushMessage({
+      to: order.customer.lineUserId,
+      messages: [flexMessage]
+    });
+    console.log(`[Notification] PaymentConfirmed notification sent for Order #${orderId}`);
+  } catch (err) {
+    console.error(`[Notification] Failed to send PaymentConfirmed notification for Order #${orderId}:`, err);
+  }
+}
+
+export async function sendOrderShippedNotification(orderId: number) {
+  try {
+    const order = await prisma.order.findUnique({
+      where: { id: orderId },
+      include: { customer: true }
+    });
+
+    if (!order || !order.customer?.lineUserId) {
+      console.log(`[Notification] Order #${orderId} has no associated lineUserId or does not exist.`);
+      return;
+    }
+
+    const flexMessage: any = {
+      type: "flex",
+      altText: "HomAroma: สินค้าของคุณอยู่ระหว่างจัดส่ง",
+      contents: {
+        type: "bubble",
+        header: {
+          type: "box",
+          layout: "vertical",
+          backgroundColor: "#1C3F3A",
+          contents: [
+            {
+              type: "text",
+              text: "ออเดอร์ของคุณกำลังเดินทาง 🚚",
+              color: "#FFFFFF",
+              weight: "bold",
+              size: "md"
+            }
+          ]
+        },
+        body: {
+          type: "box",
+          layout: "vertical",
+          spacing: "md",
+          contents: [
+            {
+              type: "box",
+              layout: "horizontal",
+              contents: [
+                {
+                  type: "text",
+                  text: "หมายเลขออเดอร์:",
+                  size: "sm",
+                  color: "#888888",
+                  flex: 2
+                },
+                {
+                  type: "text",
+                  text: `#HM-${order.id}`,
+                  size: "sm",
+                  color: "#333333",
+                  weight: "bold",
+                  flex: 3
+                }
+              ]
+            },
+            {
+              type: "box",
+              layout: "horizontal",
+              contents: [
+                {
+                  type: "text",
+                  text: "หมายเลขพัสดุ:",
+                  size: "sm",
+                  color: "#888888",
+                  flex: 2
+                },
+                {
+                  type: "text",
+                  text: order.trackingNo || "อยู่ระหว่างเข้ารับพัสดุ",
+                  size: "sm",
+                  color: "#1C3F3A",
+                  weight: "bold",
+                  flex: 3
+                }
+              ]
+            }
+          ]
+        },
+        footer: {
+          type: "box",
+          layout: "vertical",
+          contents: [
+            {
+              type: "button",
+              style: "primary",
+              color: "#1C3F3A",
+              action: {
+                "type": "uri",
+                "label": "เช็คสถานะการจัดส่ง",
+                "uri": "https://spa.homaroma.shop/track-order"
+              }
+            }
+          ]
+        }
+      }
+    };
+
+    await lineClient.pushMessage({
+      to: order.customer.lineUserId,
+      messages: [flexMessage]
+    });
+    console.log(`[Notification] OrderShipped notification sent for Order #${orderId}`);
+  } catch (err) {
+    console.error(`[Notification] Failed to send OrderShipped notification for Order #${orderId}:`, err);
+  }
+}
+
+export async function sendOrderCancelledNotification(orderId: number) {
+  try {
+    const order = await prisma.order.findUnique({
+      where: { id: orderId },
+      include: { customer: true }
+    });
+
+    if (!order || !order.customer?.lineUserId) {
+      console.log(`[Notification] Order #${orderId} has no associated lineUserId or does not exist.`);
+      return;
+    }
+
+    const flexMessage: any = {
+      type: "flex",
+      altText: "HomAroma: คำสั่งซื้อของคุณถูกยกเลิกแล้ว",
+      contents: {
+        type: "bubble",
+        header: {
+          type: "box",
+          layout: "vertical",
+          backgroundColor: "#8C2A2A",
+          contents: [
+            {
+              type: "text",
+              text: "คำสั่งซื้อถูกยกเลิก 🚫",
+              color: "#FFFFFF",
+              weight: "bold",
+              size: "md"
+            }
+          ]
+        },
+        body: {
+          type: "box",
+          layout: "vertical",
+          spacing: "md",
+          contents: [
+            {
+              type: "text",
+              text: `คำสั่งซื้อหมายเลข #HM-${order.id} ได้ถูกยกเลิกแล้ว เนื่องจากเกินกำหนดเวลาชำระเงิน หรือสิทธิประโยชน์บางประการ หรือตามความประสงค์ของคุณ`,
+              size: "sm",
+              color: "#333333",
+              wrap: true
+            },
+            ...(order.pointsUsed > 0 ? [
+              {
+                type: "text",
+                text: `* ระบบได้ทำการคืนคะแนนสะสมจำนวน ${order.pointsUsed} แต้มเข้าบัญชีของคุณเรียบร้อยแล้ว`,
+                size: "xs",
+                color: "#8C2A2A",
+                weight: "bold",
+                margin: "md"
+              }
+            ] : [])
+          ]
+        },
+        footer: {
+          type: "box",
+          layout: "vertical",
+          contents: [
+            {
+              type: "button",
+              style: "primary",
+              color: "#1C3F3A",
+              action: {
+                "type": "uri",
+                "label": "ช้อปต่ออีกครั้ง",
+                "uri": "https://spa.homaroma.shop/"
+              }
+            }
+          ]
+        }
+      }
+    };
+
+    await lineClient.pushMessage({
+      to: order.customer.lineUserId,
+      messages: [flexMessage]
+    });
+    console.log(`[Notification] OrderCancelled notification sent for Order #${orderId}`);
+  } catch (err) {
+    console.error(`[Notification] Failed to send OrderCancelled notification for Order #${orderId}:`, err);
+  }
+}
+
+export async function markOrderAsPaid(orderId: number) {
+  try {
+    const order = await prisma.order.findUnique({
+      where: { id: orderId }
+    });
+
+    if (!order) {
+      console.log(`[Payment] Order #${orderId} not found in markOrderAsPaid.`);
+      return;
+    }
+
+    if (order.status === "PAID") {
+      console.log(`[Payment] Order #${orderId} is already PAID.`);
+      return;
+    }
+
+    // 1. Update status to PAID
+    await prisma.order.update({
+      where: { id: orderId },
+      data: { status: "PAID" }
+    });
+
+    // 2. Grant points
+    if (order.customerId && order.pointsEarned > 0) {
+      await prisma.customer.update({
+        where: { id: order.customerId },
+        data: { points: { increment: order.pointsEarned } }
+      });
+      console.log(`[Payment] Granted ${order.pointsEarned} points to Customer #${order.customerId} for Order #${orderId}`);
+    }
+
+    // 3. Send payment notification
+    await sendPaymentConfirmedNotification(orderId);
+  } catch (err) {
+    console.error(`[Payment] Error in markOrderAsPaid for Order #${orderId}:`, err);
+  }
+}
+
diff --git a/apps/backend/src/routes/line.ts b/apps/backend/src/routes/line.ts
index 6454638..b5b4ec8 100644
--- a/apps/backend/src/routes/line.ts
+++ b/apps/backend/src/routes/line.ts
@@ -37,7 +37,7 @@ const webhookHandler = async ({ request, body, set }: { request: Request, body:
 
   try {
     const parsedBody = typeof body === 'string' ? JSON.parse(body) : body;
-    const events: line.WebhookEvent[] = parsedBody.events || [];
+    const events: line.webhook.Event[] = parsedBody.events || [];
 
     for (const event of events) {
       if (event.type === 'message' && event.message.type === 'text') {
@@ -48,7 +48,7 @@ const webhookHandler = async ({ request, body, set }: { request: Request, body:
 
         // Simple echo bot for now
         await lineClient.replyMessage({
-          replyToken: event.replyToken,
+          replyToken: event.replyToken!,
           messages: [{
             type: 'text',
             text: `คุณส่งข้อความว่า: ${event.message.text}`
diff --git a/apps/backend/src/routes/orders.ts b/apps/backend/src/routes/orders.ts
index 29c674e..f5dc57d 100644
--- a/apps/backend/src/routes/orders.ts
+++ b/apps/backend/src/routes/orders.ts
@@ -1,5 +1,12 @@
 import { Elysia, t } from "elysia";
 import prisma from "../lib/prisma";
+import {
+  sendOrderCreatedNotification,
+  sendPaymentConfirmedNotification,
+  sendOrderShippedNotification,
+  sendOrderCancelledNotification,
+  markOrderAsPaid
+} from "../lib/notifications";
 
 export const ordersRoute = new Elysia({ prefix: "/orders" })
   .get("/", async () => {
@@ -87,6 +94,11 @@ export const ordersRoute = new Elysia({ prefix: "/orders" })
         }
       }
       
+      // Trigger LINE notification asynchronously
+      sendOrderCreatedNotification(order.id).catch(e => {
+        console.error("Failed to trigger sendOrderCreatedNotification:", e);
+      });
+      
       return order;
     } catch (err) {
       console.error("[Orders] Error:", err);
@@ -127,29 +139,40 @@ export const ordersRoute = new Elysia({ prefix: "/orders" })
       const { status } = body as any;
       const order = await prisma.order.findUnique({ where: { id: Number(id) } });
       
-      const updatedOrder = await prisma.order.update({
-        where: { id: Number(id) },
-        data: { status },
-        include: { items: true }
+      if (!order) {
+        set.status = 404;
+        return { error: "Order not found" };
+      }
+
+      if (status === 'PAID') {
+        await markOrderAsPaid(order.id);
+      } else {
+        await prisma.order.update({
+          where: { id: order.id },
+          data: { status }
+        });
+
+        // If status becomes CANCELLED, refund the points used and notify
+        if (status === 'CANCELLED' && order.status !== 'CANCELLED') {
+          if (order.customerId && order.pointsUsed > 0) {
+            await prisma.customer.update({
+              where: { id: order.customerId },
+              data: { points: { increment: order.pointsUsed } }
+            });
+          }
+          sendOrderCancelledNotification(order.id).catch(e => console.error(e));
+        }
+
+        // If status becomes SHIPPED, notify
+        if (status === 'SHIPPED' && order.status !== 'SHIPPED') {
+          sendOrderShippedNotification(order.id).catch(e => console.error(e));
+        }
+      }
+
+      return await prisma.order.findUnique({
+        where: { id: order.id },
+        include: { items: true, customer: true }
       });
-
-      // Grant points if status becomes PAID and it wasn't PAID before
-      if (status === 'PAID' && order?.status !== 'PAID' && order?.customerId && order?.pointsEarned > 0) {
-        await prisma.customer.update({
-          where: { id: order.customerId },
-          data: { points: { increment: order.pointsEarned } }
-        });
-      }
-
-      // If status becomes CANCELLED, refund the points used
-      if (status === 'CANCELLED' && order?.status !== 'CANCELLED' && order?.customerId && order?.pointsUsed > 0) {
-        await prisma.customer.update({
-          where: { id: order.customerId },
-          data: { points: { increment: order.pointsUsed } }
-        });
-      }
-
-      return updatedOrder;
     } catch (err) {
       set.status = 500;
       return { error: "Failed to update order status" };
@@ -179,11 +202,16 @@ export const ordersRoute = new Elysia({ prefix: "/orders" })
   .patch("/:id/tracking", async ({ params: { id }, body, set }) => {
     try {
       const { trackingNo } = body as any;
-      return await prisma.order.update({
+      const order = await prisma.order.update({
         where: { id: Number(id) },
-        data: { trackingNo },
+        data: { trackingNo, status: "SHIPPED" },
         include: { items: true }
       });
+      // Trigger notification asynchronously
+      sendOrderShippedNotification(order.id).catch(e => {
+        console.error("Failed to trigger sendOrderShippedNotification:", e);
+      });
+      return order;
     } catch (err) {
       set.status = 500;
       return { error: "Failed to update tracking number" };
diff --git a/apps/backend/src/routes/payments.ts b/apps/backend/src/routes/payments.ts
index 281f717..6e2be0d 100644
--- a/apps/backend/src/routes/payments.ts
+++ b/apps/backend/src/routes/payments.ts
@@ -1,5 +1,6 @@
 import { Elysia, t } from "elysia";
 import prisma from "../lib/prisma";
+import { markOrderAsPaid } from "../lib/notifications";
 
 const OMISE_SECRET_KEY = process.env.OMISE_SECRET_KEY || "";
 
@@ -67,10 +68,7 @@ export const paymentsRoute = new Elysia({ prefix: "/payments" })
 
         // If card payment is immediately successful (some cards don't require 3DS)
         if (charge.status === "successful") {
-          await prisma.order.update({
-            where: { id: orderId },
-            data: { status: "PAID" }
-          });
+          await markOrderAsPaid(orderId);
         }
 
         return {
@@ -161,10 +159,7 @@ export const paymentsRoute = new Elysia({ prefix: "/payments" })
           const orderId = parseInt(orderIdStr, 10);
           console.log(`[Omise Webhook] Payment successful for Order #${orderId}`);
           
-          await prisma.order.update({
-            where: { id: orderId },
-            data: { status: "PAID" }
-          });
+          await markOrderAsPaid(orderId);
         }
       }