Overview: Coupon Code System Module

The Coupon Code System module provides a robust solution for creating, managing, and tracking discount codes with flexible parameters such as expiration dates, usage limits, and redemption caps. This module empowers businesses to offer targeted promotions while ensuring that discounts are applied fairly and securely.

Purpose

The primary purpose of this module is to streamline the creation and management of coupon codes, enabling businesses to provide incentives to customers while maintaining control over their distribution and usage. It allows for the generation of unique or bulk discount codes with customizable rules, making it an essential tool for managing promotional campaigns effectively.

Benefits

• Efficient Discount Management: Automates the process of creating and assigning coupon codes with specific conditions such as expiration dates, usage limits, and redemption caps.
• Prevent Abuse: Mitigate fraud and unauthorized use by setting restrictions on how many times a coupon can be used or shared.
• Track Redemption: Monitor coupon usage in real-time to ensure compliance with business rules and identify potential issues quickly.
• Versatile Application: Suitable for various industries, including retail, e-commerce, subscription services, and more, allowing businesses to tailor promotions to their specific needs.

Usage Scenarios

The Coupon Code System module can be utilized in a wide range of scenarios:

1. Retail Promotions: Run limited-time offers or seasonal discounts during sales events.
2. E-Commerce Campaigns: Distribute coupons through email marketing, social media, or in-store promotions to attract new customers or reward existing ones.
3. Subscription Services: Offer trial periods, discounted renewals, or referral incentives using coupon codes with specific usage rules.
4. Customized Offers: Create unique discount codes for exclusive partnerships, loyalty programs, or special events.
5. Bulk Discounts: Generate multiple coupons for bulk sales or promotional giveaways.

By leveraging the Coupon Code System module, businesses can enhance customer engagement, drive sales, and manage their promotional activities with greater efficiency and control.

Features of Coupon Code System Module

1. Coupon Creation

• Description: Enables the creation of new coupon codes with specific attributes such as discount type (fixed amount or percentage), applicable products/services, and restrictions.

2. Expiration Dates

• Description: Allows setting start and end dates for coupons to ensure they expire automatically after a specified period.

3. Usage Limits

• Description: Sets the maximum number of times a coupon can be used in total or by individual users, enforcing these limits during redemption attempts.

4. Redemption Process Integration

• Description: Facilitates the application of coupons during transactions, ensuring validation before discount application and updating usage counters.

5. Validation Checks

• Description: Performs checks on coupon validity, including expiration status, remaining uses, eligibility criteria, and fraud detection mechanisms like IP tracking or rate limiting.

6. Multi-Channel Support

• Description: Supports redemption across various platforms (web, mobile, POS) and integrates with other modules for a unified user experience.

7. Secure Storage and Encryption

• Description: Ensures coupon codes are stored securely, with encryption and access controls to prevent unauthorized use or tampering.

8. Reporting and Analytics

• Description: Provides tools to track coupon performance, usage trends, and identify fraudulent activities through detailed reporting.

9. Administration Tools

• Description: Offers an interface for managing coupons, including viewing details, updating codes, deleting expired ones, and monitoring usage statistics.

This module is designed to be flexible and robust, catering to the needs of developers by providing comprehensive control over discount code management while ensuring security and efficiency in transactions.

Technical Documentation for Coupon Code System

1. API Endpoint (FastAPI)

This FastAPI endpoint validates coupon codes and applies discounts based on predefined rules.

# coupon_api.py
from fastapi import APIRouter, Depends, HTTPException
from typing import Annotated
from pydantic import BaseModel, EmailStr
from datetime import datetime
import os
from dotenv import load_dotenv

load_dotenv()

router = APIRouter()
coupon_db = "postgresql://user:password@localhost/coupon_db"
Session = sessionmaker(bind=create_engine(coupon_db))
session = Session()

class Coupon(BaseModel):
    code: str
    discount_type: str  # PERCENT or FIXED
    discount_value: float
    expires_at: datetime
    max_uses: int
    uses_per_user: int

@router.post("/api/coupon/validate", response_model=Coupon)
async def validate_coupon(coupon_code: CouponCodeRequest):
    db = session()
    try:
        coupon = db.query(Coupon).filter(Coupon.code == coupon_code.code).first()
        
        if not coupon:
            raise HTTPException(status_code=404, detail="Coupon code not found")
        
        # Check expiration
        if datetime.now() > coupon.expires_at:
            raise HTTPException(status_code=401, detail="Coupon expired")
        
        # Check max uses
        if coupon.max_uses <= 0:
            raise HTTPException(status_code=402, detail="Coupon out of uses")
        
        # Check user usage limit
        user_usage = db.query(func.count(UserCoupon.code)).filter(
            UserCoupon.code == coupon.code,
            UserCoupon.user_id == user_id
        ).scalar()
        
        if user_usage >= coupon.uses_per_user:
            raise HTTPException(status_code=403, detail="User usage limit exceeded")
        
        # Apply discount logic
        discount = calculate_discount(coupon.discount_type, coupon.discount_value)
        
        return {"message": "Coupon applied successfully", "discount": discount}
    
    except Exception as e:
        db.rollback()
        raise HTTPException(status_code=500, detail=str(e))
    finally:
        db.close()

2. React UI Snippet

A simple React component for coupon code input and validation.

// CouponInput.js
import React, { useState } from 'react';

const CouponInput = ({ onSuccess }) => {
  const [code, setCode] = useState('');
  const [isLoading, setIsLoading] = useState(false);
  const [error, setError] = useState('');

  const handleSubmit = async (e) => {
    e.preventDefault();
    setIsLoading(true);
    setError('');
    
    try {
      const response = await fetch('/api/coupon/validate', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({ code }),
      });
      
      if (!response.ok) {
        throw new Error('Invalid coupon code');
      }
      
      const data = await response.json();
      onSuccess(data.discount);
    } catch (err) {
      setError(err.message || 'Failed to validate coupon');
    } finally {
      setIsLoading(false);
    }
  };

  return (
    <div>
      <form onSubmit={handleSubmit}>
        <input
          type="text"
          value={code}
          onChange={(e) => setCode(e.target.value)}
          placeholder="Enter coupon code"
        />
        <button type="submit" disabled={isLoading}>
          {isLoading ? 'Validating...' : 'Apply'}
        </button>
      </form>
      
      {error && <p style={{ color: 'red' }}>{error}</p>}
    </div>
  );
};

export default CouponInput;

3. Data Schema (Pydantic)

Defining the structure of a coupon code with validation constraints.

# models.py
from pydantic import BaseModel, validator
from datetime import datetime
import re

class CouponCode(BaseModel):
    id: int
    code: str
    discount_type: str  # PERCENT or FIXED
    discount_value: float
    expires_at: datetime
    max_uses: int
    uses_per_user: int
    
    @validator('code')
    def valid_code(cls, value):
        if not re.match(r'^[A-Z][0-9]{5}$', value):
            raise ValueError("Invalid coupon code format")
        return value
    
    @validator('discount_value')
    def check_discount(cls, value, field_info):
        if value <= 0 or (field_info.metadata.get('discount_type') == 'PERCENT' and value > 100):
            raise ValueError("Discount value must be greater than 0 and less than or equal to 100%")
        return value
    
    @validator('max_uses')
    def check_max_uses(cls, value):
        if value < 1:
            raise ValueError("Max uses must be at least 1")
        return value

Summary

• API Endpoint: The FastAPI endpoint provides a robust way to validate and apply coupons with proper error handling.
• React UI: A user-friendly component that integrates with the API, handling states for loading and errors.
• Data Schema: Pydantic ensures data integrity and validation at the model level.

This setup allows developers to seamlessly integrate coupon functionality into their applications.

Technical Documentation for Coupon Code System Module

Overview

The Coupon Code System module allows businesses to generate, manage, and track discount codes with flexible configurations such as expiration dates, usage limits, and discount caps. This module is designed to integrate seamlessly into payment systems, e-commerce platforms, or any application requiring coupon management.

Related Modules

Here are 3–5 related modules that work well with the Coupon Code System:

1. Payment Gateway Integration

   • Facilitates seamless payment processing when coupons are applied.
   • Example: Stripe, PayPal, or Braintree integration.

2. User Authentication

   • Restricts coupon usage to authenticated users only (e.g., registered customers).

3. Email Service Provider

   • Used to send coupon codes to users via email as part of marketing campaigns.

4. Order Management System

   • Tracks how coupons are applied to orders and calculates discounts during checkout.

5. Reports & Analytics

   • Provides insights into coupon usage trends, redemption rates, and revenue impact.

Use Cases

1. Creating a Coupon Code

• A business admin creates a coupon code with:
  • Discount type (e.g., fixed amount or percentage).
  • Expiration date.
  • Usage limits (e.g., single use per user or unlimited).
  • Applicable products/categories.

2. Applying a Coupon During Checkout

• A customer enters a coupon code at checkout, and the system validates:
  • If the coupon is expired.
  • If the coupon has remaining uses.
  • If the coupon applies to the selected product(s).

3. Checking Coupon Validity

• The system verifies the coupon’s validity before applying the discount to ensure it meets all predefined rules.

4. Bulk Creation for Marketing Campaigns

• A business generates multiple coupons in bulk for a promotional campaign, with specific constraints such as:
  • Start and end dates.
  • Usage caps per customer.
  • Excluded products or categories.

5. Tracking Coupon Usage History

• The system logs all coupon redemptions, including details like:
  • User ID (if authenticated).
  • Order ID.
  • Timestamp of redemption.
  • Discount applied.

Integration Tips

1. API Endpoints

   • Provide RESTful API endpoints for creating, reading, updating, and deleting coupons.
     • POST /api/coupons — Create a new coupon.
     • GET /api/coupons/{id} — Retrieve a single coupon by ID.
     • PUT /api/coupons/{id} — Update an existing coupon.
     • DELETE /api/coupons/{id} — Delete a coupon.

2. Asynchronous Processing

   • For bulk operations, handle coupon generation and updates asynchronously to avoid performance bottlenecks.

3. Coupon Validation Hook

   • Expose a validation function that can be called before applying the coupon (useful for custom logic).

4. Event Publishing

   • Publish events when coupons are created or redeemed (e.g., notify an analytics system or email service).

5. Error Handling

   • Implement proper error handling for cases like invalid coupon codes, expired coupons, or exceeded usage limits.

Configuration Options

Conclusion

The Coupon Code System module provides a robust solution for managing discount codes with configurable rules and integration capabilities. By leveraging related modules, developers can create a seamless and scalable coupon management system tailored to their business needs.