Invoice Generator Website -- 2
Budget: ₹37,500 – ₹75,000 INR
I need an invoice generator website tailored for small businesses.
Complete Detailed Requirements Document
---
## 1. Project Overview
Build a **secure, scalable, user-friendly invoice generator website** similar to [yourbill.in](https://yourbill.in/), designed primarily for Indian businesses.
**Core goals:**
* Enable users to create, manage, and send GST-compliant invoices
* Manage customers, products, and invoice history
* Support multiple sending channels (Email, WhatsApp, SMS)
* Responsive and mobile-friendly UI
* Subscription-based pricing with usage limits
* Secure user authentication and data handling
* Integration with payment gateways for subscription billing
* Use Cloudflare for email verification and DNS/email authentication
---
## 2. Functional Requirements
### 2.1 User Registration & Authentication
* User sign-up/login with email and password
* Password encryption (bcrypt)
* Email verification during registration using Cloudflare email validation API or similar
* Forgot password and reset password functionality
* Session management using JWT or secure sessions
### 2.2 User Profile Setup
* Collect and edit business information:
* Business name
* GSTIN
* Registered state (for GST tax calculation)
* Contact details
### 2.3 Customer Management
* Add, edit, delete customers
* Store: customer name, email, phone number, state, and optional GSTIN
### 2.4 Product/Service Management
* Add, edit, delete products or services
* Fields: product name, HSN code, unit price, GST percentage, unit
### 2.5 Invoice Creation
* Create invoices by selecting or adding customers
* Add products/services manually or from the product library
* Auto-calculate CGST, SGST, IGST based on seller & buyer states
* Auto-generate invoice numbers with configurable prefixes
* Set invoice and due dates
* Add notes or terms
* Preview invoice before saving
### 2.6 Invoice Management Dashboard
* List all invoices with filters: date range, status, customer, invoice number
* Invoice statuses: Draft, Sent, Paid, Overdue
* Edit invoices if not marked paid
* Mark invoices as paid
* Download invoice as PDF
* Print invoice
### 2.7 Sending Invoices
* Send invoices via:
* Email (using Nodemailer, SendGrid, etc.)
* WhatsApp (via WhatsApp Business API using Twilio, WATI, or similar BSP)
* SMS (optional, via Twilio or equivalent)
* Use approved message templates for WhatsApp
* Attach invoice PDF or link in messages
* Track delivery and sending status (where API allows)
* Option to resend invoices
### 2.8 Email Verification and Deliverability (Cloudflare Integration)
* Validate emails during user/customer input using Cloudflare email validation API or equivalent
* Configure SPF, DKIM, and DMARC DNS records via Cloudflare for email domain to ensure high deliverability and prevent spoofing
* Optionally use Cloudflare Workers for serverless edge email validation
* Protect APIs and forms using Cloudflare firewall and bot management
### 2.9 Security & Data Privacy
* HTTPS enforced site-wide
* Passwords hashed using bcrypt or equivalent
* Input validation and sanitization
* Role-based access if applicable
* Secure storage of sensitive data
* Rate limiting and logging of API calls
* GDPR and local data protection compliance (if applicable)
---
## 3. Pricing & Subscription Plans
| Plan Name | Price (₹/month) | Invoice Limit | Accounts | Products | Customers | Features |
| ---------------- | --------------- | ------------------ | ------------------ | --------- | --------- | ---------------------------------------------------- |
| **Starter Vibe** | ₹499 | 50 invoices/month | 1 account | Unlimited | Unlimited | Live P\&L, Easy Reporting, Excel export for taxation |
| **Hustler Mode** | ₹999 | 150 invoices/month | 3 accounts | Unlimited | Unlimited | Live P\&L, Easy Reporting, Excel export for taxation |
| **Boss Boost** | ₹1999 | Unlimited invoices | Unlimited accounts | Unlimited | Unlimited | Live P\&L, Easy Reporting, Excel export for taxation |
* User can upgrade/downgrade plans anytime
* System enforces invoice limits per plan
* User dashboard shows usage and remaining quota
* Admin can manage all users’ subscription plans
---
## 4. Payment Gateway Integration
* Integrate Indian payment gateways (Razorpay preferred, also Paytm, CCAvenue, Instamojo)
* Support subscription payments and automatic recurring billing
* Support multiple payment methods (UPI, cards, wallets, net banking)
* Secure payment handling and PCI compliance
* Webhooks for payment status updates
* Retry mechanism for failed payments
* Refund processing (optional)
* Display payment and billing info in user profile
* Admin dashboard to monitor transactions
---
## 5. Subscription Management Dashboard
### User View
* Show current plan details and benefits
* Show invoice usage (e.g., “45/50 invoices used this month”)
* Allow upgrade/downgrade (with proration if feasible)
* Display next billing date and payment status
* Show billing history and receipts
* Cancel subscription option
### Admin View
* Manage all user subscriptions and plans
* View payment statuses and history
* Generate reports on subscriptions and revenue
* Send alerts for approaching invoice limits or failed payments
---
## 6. Technical Requirements
### Frontend
* React (preferred) or Vue/Angular
* Responsive, mobile-friendly UI
* UI framework: Tailwind CSS or Material UI
* Form validation and error handling
### Backend
* Node.js with Express or similar framework
* RESTful API architecture
* Authentication via JWT or sessions
* Input validation and sanitization
* Use environment variables for secrets and API keys
### Database
* MongoDB (preferred) or PostgreSQL
* Schemas: users, customers, products, invoices, subscriptions, logs
### Storage
* Invoice PDFs stored on cloud storage (AWS S3, DigitalOcean Spaces, or similar)
* Backup and secure file access
### Email & Messaging
* Email sending via Nodemailer, SendGrid, or similar
* WhatsApp integration via WhatsApp Business Cloud API (through Twilio, WATI, or similar BSP)
* SMS integration (optional)
### Security
* Enforce HTTPS
* Implement rate limiting
* Secure password storage (bcrypt)
* CSRF and XSS protection
* Use Cloudflare for DNS, firewall, bot management, and email authentication records
---
## 7. Deliverables
* Complete source code (frontend and backend) in Git repository
* Deployment scripts and documentation
* API documentation for all endpoints
* Setup guide for Cloudflare email authentication and validation
* User manuals for admin and users
* Post-launch support for bug fixes (optional, define terms)
---
## 8. Timeline & Milestones (Suggested)
| Milestone | Description | Duration |
| --------------------------------------- | ---------------------------------- | -------- |
| 1. Requirement Finalization & UI Design | Wireframes, mockups, API design | 1 week |
| 2. Authentication & User Profile | Registration, login, profile setup | 1 week |
| 3. Customer & Product Management | CRUD operations | 2 weeks |
| 4. Invoice Creation & Management | Core invoice features | 2 weeks |
| 5. Email & WhatsApp Integration | Sending invoices and tracking | 1 week |
| 6. Pricing & Subscription Module | Plans, limits, payment gateway | 2 weeks |
| 7. Testing & QA | End-to-end testing | 1 week |
| 8. Deployment & Handover | Live deployment, documentation | 3 days |
--
Ideal Skills & Experience:
- Proven web development experience
- Familiarity with invoicing systems
- Strong design skills for user-friendly interfaces
- Experience with payment gateway integration
Please provide examples of previous work and a timeline for completion.
Complete Detailed Requirements Document
---
## 1. Project Overview
Build a **secure, scalable, user-friendly invoice generator website** similar to [yourbill.in](https://yourbill.in/), designed primarily for Indian businesses.
**Core goals:**
* Enable users to create, manage, and send GST-compliant invoices
* Manage customers, products, and invoice history
* Support multiple sending channels (Email, WhatsApp, SMS)
* Responsive and mobile-friendly UI
* Subscription-based pricing with usage limits
* Secure user authentication and data handling
* Integration with payment gateways for subscription billing
* Use Cloudflare for email verification and DNS/email authentication
---
## 2. Functional Requirements
### 2.1 User Registration & Authentication
* User sign-up/login with email and password
* Password encryption (bcrypt)
* Email verification during registration using Cloudflare email validation API or similar
* Forgot password and reset password functionality
* Session management using JWT or secure sessions
### 2.2 User Profile Setup
* Collect and edit business information:
* Business name
* GSTIN
* Registered state (for GST tax calculation)
* Contact details
### 2.3 Customer Management
* Add, edit, delete customers
* Store: customer name, email, phone number, state, and optional GSTIN
### 2.4 Product/Service Management
* Add, edit, delete products or services
* Fields: product name, HSN code, unit price, GST percentage, unit
### 2.5 Invoice Creation
* Create invoices by selecting or adding customers
* Add products/services manually or from the product library
* Auto-calculate CGST, SGST, IGST based on seller & buyer states
* Auto-generate invoice numbers with configurable prefixes
* Set invoice and due dates
* Add notes or terms
* Preview invoice before saving
### 2.6 Invoice Management Dashboard
* List all invoices with filters: date range, status, customer, invoice number
* Invoice statuses: Draft, Sent, Paid, Overdue
* Edit invoices if not marked paid
* Mark invoices as paid
* Download invoice as PDF
* Print invoice
### 2.7 Sending Invoices
* Send invoices via:
* Email (using Nodemailer, SendGrid, etc.)
* WhatsApp (via WhatsApp Business API using Twilio, WATI, or similar BSP)
* SMS (optional, via Twilio or equivalent)
* Use approved message templates for WhatsApp
* Attach invoice PDF or link in messages
* Track delivery and sending status (where API allows)
* Option to resend invoices
### 2.8 Email Verification and Deliverability (Cloudflare Integration)
* Validate emails during user/customer input using Cloudflare email validation API or equivalent
* Configure SPF, DKIM, and DMARC DNS records via Cloudflare for email domain to ensure high deliverability and prevent spoofing
* Optionally use Cloudflare Workers for serverless edge email validation
* Protect APIs and forms using Cloudflare firewall and bot management
### 2.9 Security & Data Privacy
* HTTPS enforced site-wide
* Passwords hashed using bcrypt or equivalent
* Input validation and sanitization
* Role-based access if applicable
* Secure storage of sensitive data
* Rate limiting and logging of API calls
* GDPR and local data protection compliance (if applicable)
---
## 3. Pricing & Subscription Plans
| Plan Name | Price (₹/month) | Invoice Limit | Accounts | Products | Customers | Features |
| ---------------- | --------------- | ------------------ | ------------------ | --------- | --------- | ---------------------------------------------------- |
| **Starter Vibe** | ₹499 | 50 invoices/month | 1 account | Unlimited | Unlimited | Live P\&L, Easy Reporting, Excel export for taxation |
| **Hustler Mode** | ₹999 | 150 invoices/month | 3 accounts | Unlimited | Unlimited | Live P\&L, Easy Reporting, Excel export for taxation |
| **Boss Boost** | ₹1999 | Unlimited invoices | Unlimited accounts | Unlimited | Unlimited | Live P\&L, Easy Reporting, Excel export for taxation |
* User can upgrade/downgrade plans anytime
* System enforces invoice limits per plan
* User dashboard shows usage and remaining quota
* Admin can manage all users’ subscription plans
---
## 4. Payment Gateway Integration
* Integrate Indian payment gateways (Razorpay preferred, also Paytm, CCAvenue, Instamojo)
* Support subscription payments and automatic recurring billing
* Support multiple payment methods (UPI, cards, wallets, net banking)
* Secure payment handling and PCI compliance
* Webhooks for payment status updates
* Retry mechanism for failed payments
* Refund processing (optional)
* Display payment and billing info in user profile
* Admin dashboard to monitor transactions
---
## 5. Subscription Management Dashboard
### User View
* Show current plan details and benefits
* Show invoice usage (e.g., “45/50 invoices used this month”)
* Allow upgrade/downgrade (with proration if feasible)
* Display next billing date and payment status
* Show billing history and receipts
* Cancel subscription option
### Admin View
* Manage all user subscriptions and plans
* View payment statuses and history
* Generate reports on subscriptions and revenue
* Send alerts for approaching invoice limits or failed payments
---
## 6. Technical Requirements
### Frontend
* React (preferred) or Vue/Angular
* Responsive, mobile-friendly UI
* UI framework: Tailwind CSS or Material UI
* Form validation and error handling
### Backend
* Node.js with Express or similar framework
* RESTful API architecture
* Authentication via JWT or sessions
* Input validation and sanitization
* Use environment variables for secrets and API keys
### Database
* MongoDB (preferred) or PostgreSQL
* Schemas: users, customers, products, invoices, subscriptions, logs
### Storage
* Invoice PDFs stored on cloud storage (AWS S3, DigitalOcean Spaces, or similar)
* Backup and secure file access
### Email & Messaging
* Email sending via Nodemailer, SendGrid, or similar
* WhatsApp integration via WhatsApp Business Cloud API (through Twilio, WATI, or similar BSP)
* SMS integration (optional)
### Security
* Enforce HTTPS
* Implement rate limiting
* Secure password storage (bcrypt)
* CSRF and XSS protection
* Use Cloudflare for DNS, firewall, bot management, and email authentication records
---
## 7. Deliverables
* Complete source code (frontend and backend) in Git repository
* Deployment scripts and documentation
* API documentation for all endpoints
* Setup guide for Cloudflare email authentication and validation
* User manuals for admin and users
* Post-launch support for bug fixes (optional, define terms)
---
## 8. Timeline & Milestones (Suggested)
| Milestone | Description | Duration |
| --------------------------------------- | ---------------------------------- | -------- |
| 1. Requirement Finalization & UI Design | Wireframes, mockups, API design | 1 week |
| 2. Authentication & User Profile | Registration, login, profile setup | 1 week |
| 3. Customer & Product Management | CRUD operations | 2 weeks |
| 4. Invoice Creation & Management | Core invoice features | 2 weeks |
| 5. Email & WhatsApp Integration | Sending invoices and tracking | 1 week |
| 6. Pricing & Subscription Module | Plans, limits, payment gateway | 2 weeks |
| 7. Testing & QA | End-to-end testing | 1 week |
| 8. Deployment & Handover | Live deployment, documentation | 3 days |
--
Ideal Skills & Experience:
- Proven web development experience
- Familiarity with invoicing systems
- Strong design skills for user-friendly interfaces
- Experience with payment gateway integration
Please provide examples of previous work and a timeline for completion.