diff --git a/backend/controllers/shop/sub-controllers/adminController.js b/backend/controllers/shop/sub-controllers/adminController.js
new file mode 100644
index 00000000..61f9054d
--- /dev/null
+++ b/backend/controllers/shop/sub-controllers/adminController.js
@@ -0,0 +1,44 @@
+const Payment = require("../models/payment");
+const Invoice = require("../models/invoice");
+
+// Admin view all payments
+const adminViewPayments = async (req, res) => {
+  try {
+    const payments = await Payment.find()
+      .populate("orderId")
+      .populate("userId");
+    res.status(200).json(payments);
+  } catch (error) {
+    res.status(500).json({ message: error.message });
+  }
+};
+
+// Admin view all invoices
+const adminViewInvoices = async (req, res) => {
+  try {
+    const invoices = await Invoice.find()
+      .populate("orderId")
+      .populate("userId");
+    res.status(200).json(invoices);
+  } catch (error) {
+    res.status(500).json({ message: error.message });
+  }
+};
+
+// Admin filter/sort payments
+const adminFilterPayments = async (req, res) => {
+  const { status, startDate, endDate } = req.query;
+  const filters = {};
+  if (status) filters.paymentStatus = status;
+  if (startDate && endDate)
+    filters.paymentDate = { $gte: startDate, $lte: endDate };
+
+  try {
+    const payments = await Payment.find(filters);
+    res.status(200).json(payments);
+  } catch (error) {
+    res.status(500).json({ message: error.message });
+  }
+};
+
+module.exports = { adminViewPayments, adminViewInvoices, adminFilterPayments };
diff --git a/backend/controllers/shop/sub-controllers/paymentController.js b/backend/controllers/shop/sub-controllers/paymentController.js
new file mode 100644
index 00000000..0bc6569d
--- /dev/null
+++ b/backend/controllers/shop/sub-controllers/paymentController.js
@@ -0,0 +1,161 @@
+const Payment = require("../models/payment");
+
+// Retrieve all payments
+const getAllPayments = async (req, res) => {
+  try {
+    const payments = await Payment.find();
+    res.status(200).json(payments);
+  } catch (error) {
+    res.status(500).json({ message: error.message });
+  }
+};
+
+// Retrieve payment by ID
+const getPaymentById = async (req, res) => {
+  try {
+    const payment = await Payment.findById(req.params.id);
+    if (!payment) return res.status(404).json({ message: "Payment not found" });
+    res.status(200).json(payment);
+  } catch (error) {
+    res.status(500).json({ message: error.message });
+  }
+};
+
+// Create a new payment
+const createPayment = async (req, res) => {
+  const { orderId, userId, amount, paymentMethod, transactionId } = req.body;
+
+  const newPayment = new Payment({
+    paymentId: `PAY${Date.now()}`,
+    orderId,
+    userId,
+    amount,
+    paymentMethod,
+    transactionId,
+  });
+
+  try {
+    const payment = await newPayment.save();
+    res.status(201).json(payment);
+  } catch (error) {
+    res.status(400).json({ message: error.message });
+  }
+};
+
+// Update payment status
+const updatePaymentStatus = async (req, res) => {
+  const { paymentStatus } = req.body;
+  try {
+    const payment = await Payment.findByIdAndUpdate(
+      req.params.id,
+      { paymentStatus },
+      { new: true }
+    );
+    if (!payment) return res.status(404).json({ message: "Payment not found" });
+    res.status(200).json(payment);
+  } catch (error) {
+    res.status(500).json({ message: error.message });
+  }
+};
+const Payment = require("../models/payment");
+
+// Update Payment Method
+const updatePaymentMethod = async (req, res) => {
+  const { paymentMethod } = req.body;
+  try {
+    if (!["Credit Card", "PayPal", "Bank Transfer"].includes(paymentMethod)) {
+      return res.status(400).json({ message: "Invalid payment method" });
+    }
+    const payment = await Payment.findByIdAndUpdate(
+      req.params.id,
+      { paymentMethod },
+      { new: true }
+    );
+    if (!payment) return res.status(404).json({ message: "Payment not found" });
+    res.status(200).json(payment);
+  } catch (error) {
+    res.status(500).json({ message: error.message });
+  }
+};
+
+// Retrieve Payments by Date Range
+const getPaymentsByDateRange = async (req, res) => {
+  const { startDate, endDate } = req.query;
+  try {
+    const payments = await Payment.find({
+      paymentDate: {
+        $gte: new Date(startDate),
+        $lte: new Date(endDate),
+      },
+    });
+    if (!payments.length)
+      return res
+        .status(404)
+        .json({ message: "No payments found in this date range" });
+    res.status(200).json(payments);
+  } catch (error) {
+    res.status(500).json({ message: error.message });
+  }
+};
+
+// Retrieve Payments by Amount Range
+const getPaymentsByAmountRange = async (req, res) => {
+  const { minAmount, maxAmount } = req.query;
+  try {
+    const payments = await Payment.find({
+      amount: { $gte: minAmount, $lte: maxAmount },
+    });
+    if (!payments.length)
+      return res
+        .status(404)
+        .json({ message: "No payments found in this amount range" });
+    res.status(200).json(payments);
+  } catch (error) {
+    res.status(500).json({ message: error.message });
+  }
+};
+
+// Retrieve Payment by Transaction ID
+const getPaymentByTransactionId = async (req, res) => {
+  try {
+    const payment = await Payment.findOne({
+      transactionId: req.params.transactionId,
+    });
+    if (!payment)
+      return res
+        .status(404)
+        .json({ message: "Payment not found with this transaction ID" });
+    res.status(200).json(payment);
+  } catch (error) {
+    res.status(500).json({ message: error.message });
+  }
+};
+
+// Count Payments by Status
+const countPaymentsByStatus = async (req, res) => {
+  try {
+    const counts = await Payment.aggregate([
+      {
+        $group: {
+          _id: "$paymentStatus",
+          count: { $sum: 1 },
+        },
+      },
+    ]);
+    res.status(200).json(counts);
+  } catch (error) {
+    res.status(500).json({ message: error.message });
+  }
+};
+
+module.exports = {
+  getAllPayments,
+  getPaymentById,
+  createPayment,
+  updatePaymentStatus,
+  updatePaymentMethod,
+  getPaymentsByDateRange,
+  getPaymentsByAmountRange,
+  getPaymentByTransactionId,
+  countPaymentsByStatus,
+};
diff --git a/backend/middleware/sub-ware/validatePaymentInvoice.js b/backend/middleware/sub-ware/validatePaymentInvoice.js
new file mode 100644
index 00000000..e208773e
--- /dev/null
+++ b/backend/middleware/sub-ware/validatePaymentInvoice.js
@@ -0,0 +1,25 @@
+const validatePaymentData = (req, res, next) => {
+  const { orderId, userId, amount, paymentMethod, transactionId } = req.body;
+
+  if (!orderId || !userId || !amount || !paymentMethod || !transactionId) {
+    return res
+      .status(400)
+      .json({ message: "All fields are required for payment" });
+  }
+
+  next();
+};
+
+const validateInvoiceData = (req, res, next) => {
+  const { orderId, userId, amount, dueDate, paymentId } = req.body;
+
+  if (!orderId || !userId || !amount || !dueDate || !paymentId) {
+    return res
+      .status(400)
+      .json({ message: "All fields are required for invoice" });
+  }
+
+  next();
+};
+
+module.exports = { validatePaymentData, validateInvoiceData };
diff --git a/backend/model/shop/sub-model/payment.js b/backend/model/shop/sub-model/payment.js
new file mode 100644
index 00000000..44182dd7
--- /dev/null
+++ b/backend/model/shop/sub-model/payment.js
@@ -0,0 +1,34 @@
+const mongoose = require("mongoose");
+
+const paymentSchema = new mongoose.Schema(
+  {
+    paymentId: { type: String, required: true, unique: true },
+    orderId: {
+      type: mongoose.Schema.Types.ObjectId,
+      ref: "Order",
+      required: true,
+    },
+    userId: {
+      type: mongoose.Schema.Types.ObjectId,
+      ref: "User",
+      required: true,
+    },
+    amount: { type: Number, required: true },
+    paymentMethod: {
+      type: String,
+      enum: ["Credit Card", "PayPal", "Bank Transfer"],
+      required: true,
+    },
+    paymentStatus: {
+      type: String,
+      default: "Pending",
+      enum: ["Pending", "Completed", "Failed"],
+    },
+    paymentDate: { type: Date, default: Date.now },
+    transactionId: { type: String, required: true },
+  },
+  { timestamps: true }
+);
+
+const Payment = mongoose.model("Payment", paymentSchema);
+module.exports = Payment;
diff --git a/backend/routes/sub-routes/paymentRoutes.js b/backend/routes/sub-routes/paymentRoutes.js
new file mode 100644
index 00000000..47c456df
--- /dev/null
+++ b/backend/routes/sub-routes/paymentRoutes.js
@@ -0,0 +1,34 @@
+const express = require("express");
+const router = express.Router();
+const {
+  getAllPayments,
+  getPaymentById,
+  getPaymentsByUserId,
+  getPaymentsByStatus,
+  createPayment,
+  updatePaymentStatus,
+  deletePayment,
+  updatePaymentMethod,
+  getPaymentsByDateRange,
+  getPaymentsByAmountRange,
+  getPaymentByTransactionId,
+  countPaymentsByStatus,
+} = require("../controllers/paymentController");
+
+// Payment routes
+router.get("/", getAllPayments); // Retrieve all payments
+router.get("/:id", getPaymentById); // Retrieve payment by ID
+router.get("/user/:userId", getPaymentsByUserId); // Retrieve payments by User ID
+router.get("/status/:status", getPaymentsByStatus); // Retrieve payments by Status
+router.post("/", createPayment); // Create a new payment
+router.patch("/:id/status", updatePaymentStatus); // Update payment status
+router.patch("/:id/method", updatePaymentMethod); // Update payment method
+router.delete("/:id", deletePayment); // Delete payment
+
+// Additional routes for edge cases
+router.get("/date-range", getPaymentsByDateRange); // Retrieve payments by date range
+router.get("/amount-range", getPaymentsByAmountRange); // Retrieve payments by amount range
+router.get("/transaction/:transactionId", getPaymentByTransactionId); // Retrieve payment by transaction ID
+router.get("/count/status", countPaymentsByStatus); // Count payments by status
+
+module.exports = router;