APIs Used for Coupon and Voucher Management System

8. Microservices Used for Coupon and Voucher Management System

10. Scalability for Coupon and Voucher Management System

RESTful APIs are commonly used for communication between different components of the system. APIs should be designed to be simple, intuitive, and consistent. Key API endpoints may include:

/coupons: Retrieves a list of available coupons.
/vouchers: Retrieves a list of vouchers for a specific user.
/redeem: Redeems a coupon or voucher for a user.
/admin/coupons: Creates a new coupon or updates an existing coupon.

Sure, let’s provide detailed explanations along with example code for all the APIs used in the Coupon and Voucher Management System

1. GET /coupons:

This API endpoint retrieves a list of available coupons.

The `/coupons` endpoint is defined using Flask’s `@app.route()` decorator, specifying the HTTP method `GET`.
When a client sends a GET request to this endpoint, the `get_coupons()` function is invoked.
Inside the `get_coupons()` function, a list of coupon objects is created, each containing details such as ID, code, discount, and min cart value.
The list of coupon objects is then converted into a JSON format using Flask’s `jsonify()` function.
Finally, the JSON response containing the list of coupons is returned to the client.

Example Code (Python Flask):

Java

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

@RestController
public class CouponController {

    // Sample coupon data
    private List<Map<String, Object>> coupons = Arrays.asList(
            Map.of("id", 1, "code", "SAVE10", "discount", 10, "min_cart_value", 50),
            Map.of("id", 2, "code", "WELCOME20", "discount", 20, "min_cart_value", 100)
    );

    @GetMapping("/coupons")
    public List<Map<String, Object>> getCoupons() {
        return coupons;
    }
}

Python

from flask import Flask, jsonify

 app = Flask(__name__)

  @app.route('/coupons', methods=['GET'])
   def get_coupons():
        coupons = [
            {"id": 1, "code": "SAVE10", "discount": 10, "min_cart_value": 50},
            {"id": 2, "code": "WELCOME20", "discount": 20, "min_cart_value": 100}
        ]
        return jsonify(coupons)

    if __name__ == '__main__':
        app.run(debug=True)

JavaScript

app.get('/coupons', (req, res) => {
    // Fetch coupons from database or external API
    Coupon.find({}, (err, coupons) => {
        if (err) {
            console.error(err);
            res.status(500).json({ error: 'Internal Server Error' });
        } else {
            res.json(coupons);
        }
    });
});

Output:

[

{

“id”: 1,

“code”: “SAVE10”,

“discount”: 10,

“min_cart_value”: 50

},

{

“id”: 2,

“code”: “WELCOME20”,

“discount”: 20,

“min_cart_value”: 100

}

]

2. GET /vouchers:

This API endpoint retrieves a list of vouchers for a specific user.

Similar to the `/coupons` endpoint, the `/vouchers` endpoint is defined with the `@app.route()` decorator, specifying the HTTP method `GET`.
When a client sends a GET request to this endpoint, the `get_vouchers()` function is called.
Inside the `get_vouchers()` function, the `user_id` parameter is extracted from the request URL using Flask’s `request.args.get()` method.
Based on the `user_id`, a list of voucher objects associated with the user is constructed.
The list of voucher objects is converted into JSON format using Flask’s `jsonify()` function.
Finally, the JSON response containing the list of vouchers is returned to the client.

Example Code (Python Flask):

Java

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

@RestController
public class VoucherController {

    // Sample voucher data
    private List<Map<String, Object>> vouchers = Arrays.asList(
            Map.of("id", 1, "code", "VOUCHER123", "status", "unused", "user_id", 1),
            Map.of("id", 2, "code", "VOUCHER456", "status", "redeemed", "user_id", 2)
    );

    @GetMapping("/vouchers")
    public List<Map<String, Object>> getVouchers(@RequestParam Long user_id) {
        List<Map<String, Object>> userVouchers = new ArrayList<>();
        for (Map<String, Object> voucher : vouchers) {
            if (voucher.get("user_id").equals(user_id)) {
                userVouchers.add(voucher);
            }
        }
        return userVouchers;
    }
}

Python

from flask import Flask, jsonify, request

 app = Flask(__name__)

  @app.route('/vouchers', methods=['GET'])
   def get_vouchers():
        user_id = request.args.get('user_id')
        # Example voucher data (replace with actual data retrieval logic)
        vouchers = [
            {"id": 1, "code": "VOUCHER123", "status": "unused"},
            {"id": 2, "code": "VOUCHER456", "status": "redeemed"}
        ]
        user_vouchers = [
            voucher for voucher in vouchers if voucher["user_id"] == int(user_id)]
        return jsonify(user_vouchers)

    if __name__ == '__main__':
        app.run(debug=True)

JavaScript

app.get('/vouchers', (req, res) => {
    const userId = req.query.user_id;
    // Authenticate user (e.g., using JWT)
    User.findById(userId, (err, user) => {
        if (err || !user) {
            res.status(401).json({ error: 'Unauthorized' });
        } else {
            // Fetch user's vouchers from database
            Voucher.find({ userId: userId }, (err, vouchers) => {
                if (err) {
                    console.error(err);
                    res.status(500).json({ error: 'Internal Server Error' });
                } else {
                    res.json(vouchers);
                }
            });
        }
    });
});

Output:

/vouchers?user_id=1	user_id=2
[ { “id”: 1, “code”: “VOUCHER123”, “status”: “unused”, “user_id”: 1 } ]	[ { “id”: 2, “code”: “VOUCHER456”, “status”: “redeemed”, “user_id”: 2 } ]

3. POST /redeem:

This API endpoint redeems a coupon or voucher for a user.

The `/redeem` endpoint is defined with the `@app.route()` decorator, specifying the HTTP method `POST`.
When a client sends a POST request to this endpoint, the `redeem_voucher()` function is called.
Inside the `redeem_voucher()` function, the voucher code to be redeemed is extracted from the request JSON body.
The voucher code is then processed (e.g., marked as redeemed) in the backend system.
Finally, a JSON response indicating the success or failure of the redemption process is returned to the client.

Example Code (Python Flask):

Java

import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;
import java.util.Map;

@RestController
public class RedeemController {

    @PostMapping("/redeem")
    public Map<String, String> redeemVoucher(@RequestBody Map<String, String> request) {
        String voucherCode = request.get("voucher_code");
        return Map.of("message", "Voucher " + voucherCode + " redeemed successfully");
    }
}

Python

from flask import Flask, jsonify, request

 app = Flask(__name__)

  @app.route('/redeem', methods=['POST'])
   def redeem_voucher():
        voucher_code = request.json['voucher_code']
        # Redeem voucher code (replace with actual redemption logic)
        # For example, update the voucher status to 'redeemed' in the database
        return jsonify({"message": f"Voucher {voucher_code} redeemed successfully"})

    if __name__ == '__main__':
        app.run(debug=True)

JavaScript

app.post('/redeem', (req, res) => {
    const voucherCode = req.body.voucher_code;
    // Verify voucher code (e.g., check against database)
    Voucher.findOne({ code: voucherCode }, (err, voucher) => {
        if (err || !voucher) {
            res.status(404).json({ error: 'Voucher not found' });
        } else if (voucher.status === 'redeemed') {
            res.status(400).json({ error: 'Voucher already redeemed' });
        } else {
            // Mark voucher as redeemed in database
            voucher.status = 'redeemed';
            voucher.save((err, redeemedVoucher) => {
                if (err) {
                    console.error(err);
                    res.status(500).json({ error: 'Internal Server Error' });
                } else {
                    res.json({ message: `Voucher ${redeemedVoucher.code} redeemed successfully` });
                }
            });
        }
    });
});

Output:

POST request to /redeem	response will be
{ “voucher_code”: “VOUCHER123” }	{ “message”: “Voucher VOUCHER123 redeemed successfully” }

4. POST/admin/coupons:

This API endpoint creates a new coupon.

Similar to the `/redeem` endpoint, the `/admin/coupons` endpoint is defined with the `@app.route()` decorator, specifying the HTTP method `POST`.
When a client sends a POST request to this endpoint, the `create_coupon()` function is called.
Inside the `create_coupon()` function, the details of the new coupon are extracted from the request JSON body.
The new coupon details are then processed (e.g., stored in the database) in the backend system.
Finally, a JSON response indicating the success or failure of the coupon creation process is returned to the client.

Example Code (Python Flask):

Java

import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;
import java.util.Map;

@RestController
public class AdminCouponController {

    @PostMapping("/admin/coupons")
    public Map<String, String> createCoupon(@RequestBody Map<String, Object> couponData) {
        // Logic to create coupon in the database
        return Map.of("message", "Coupon created successfully");
    }
}

Python

from flask import Flask, jsonify, request

 app = Flask(__name__)

  @app.route('/admin/coupons', methods=['POST'])
   def create_coupon():
        # Parse request data to extract coupon details
        coupon_data = request.json
        # Create a new coupon (replace with actual creation logic)
        # For example, insert the coupon details into the database
        return jsonify({"message": "Coupon created successfully"})

    if __name__ == '__main__':
        app.run(debug=True)

JavaScript

app.post('/admin/coupons', (req, res) => {
    // Authenticate admin (e.g., check admin credentials)
    if (!req.user || !req.user.isAdmin) {
        res.status(403).json({ error: 'Forbidden' });
    } else {
        const couponData = req.body;
        // Save new coupon to database
        const newCoupon = new Coupon(couponData);
        newCoupon.save((err, savedCoupon) => {
            if (err) {
                console.error(err);
                res.status(500).json({ error: 'Internal Server Error' });
            } else {
                res.json({ message: 'Coupon created successfully', coupon: savedCoupon });
            }
        });
    }
});

Output:

POST request to /admin/coupons	response will be
{ “id”: 3, “code”: “SUMMER25”, “discount”: 25, “min_cart_value”: 75 }	{ “message”: “Coupon created successfully” }

These examples demonstrate how to implement all the APIs used in the Coupon and Voucher Management System using Python Flask framework. They provide simple and lightweight solutions for handling HTTP requests and responses, allowing clients to interact with the server to retrieve, redeem, and create coupons and vouchers.

Authentication mechanisms such as OAuth2 or JWT should be implemented to secure API endpoints.

Design Coupon and Voucher Management System

In today’s dynamic business landscape, companies continuously seek innovative ways to engage customers and drive sales. Coupons and vouchers serve as powerful marketing tools, offering discounts and incentives to encourage purchases. However, managing these promotions efficiently requires a robust Coupon and Voucher Management System. This article provides a detailed guide to designing such a system, covering various aspects from requirement gathering to implementation.

Important Topics for Coupon and Voucher Management System

Requirement Gathering for Coupon and Voucher Management System
Capacity Estimation for Coupon and Voucher Management System
Use Case Diagram for Coupon and Voucher Management System
HLD (High-Level Design) for Coupon and Voucher Management System
LLD (Low-Level Design) for Coupon and Voucher Management System
System Architecture for Coupon and Voucher Management System
Database Design for Coupon and Voucher Management System
Microservices Used for Coupon and Voucher Management System
APIs Used for Coupon and Voucher Management System
Scalability for Coupon and Voucher Management System

APIs Used for Coupon and Voucher Management System

1. GET /coupons:

Example Code (Python Flask):

2. GET /vouchers:

Example Code (Python Flask):

3. POST /redeem:

Example Code (Python Flask):

4. POST/admin/coupons:

Example Code (Python Flask):

Design Coupon and Voucher Management System

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