Coupon Merchant
(Lineage II eCommerce - Donation Panel)

An easily configurable full-stack donation system tailored for server owners that generates unique coupons, which can be exchanged for in-game currency using the .coupon command.

Product Content

  • Frontend website (fully customizable with CSS & config)
  • Backend server (configurable with config)
  • Gameserver Java coupon manager (.coupon voice command)
  • Config files (for website & server configuration)
  • Lifetime license key (bound to server's website domain)
  • Step-by-step installation guide (PDF & Video)
  • Lifetime support


Donation Process

  • Player navigates to server's donation page (e.g. l2server.com/donate)
  • Player selects a coupon to purchase
  • Player is redirected to a secure payment page (powered by either Stripe or PayPal)
  • Player pays by either PayPal or credit card
  • If payment is successful, player is redirected to a success page where the generated coupon is displayed
  • The generated coupon is saved as a txt file
  • The generated coupon is inserted into the server's database
  • The generated coupon is sent to player's email (the one used for payment)
  • Player exchanges the coupon in server using the command '.coupon COUPON_CODE'
  • Player receives the donation reward instantly (restart not needed)


Security

  • Encrypted HTTPS communications using SSL/TLS
  • IDOR Protection through storage of coupon prices & rewards on the server to prevent manipulation
  • Anti-bruteforce measures & rate limits in both the backend & the game server
  • Verification of Stripe & PayPal success webhooks' signatures to ensure authenticity
  • Enforcement of CORS domain control to restrict unauthorized access to server resources
  • XSS attack, MIME-sniffing, Clickjacking protection through automatic security HTTP headers
  • SQL injection attack protection with parameterized queries
  • Non-disclosure of sensitive payment info in the backend server, exclusively handled by Stripe & PayPal servers
  • Secure storage of credentials & API keys in environment variables


Features

  • Fully responsive website (desktop & mobile)
  • Secure payment processing
  • PayPal or Stripe method for receiving payments
  • Auto-email coupon to client (both well-known e.g. gmail & custom email providers)
  • Analytical info & error logging to a .log file
  • Extremely simple configuration of both website & API server through a config file
  • Server .coupon voice command with flooding protection to exchange coupon


Config File

  • Website tab & panel title
  • Payment currency
  • Coupon price, name & image
  • Reward item name, id & quantity
  • Optional old quantity (bonus percentage auto calculated)
  • Backend server port
  • Owner payment receiving method (Stripe, PayPal)
  • Stripe & PayPal API keys
  • Database credentials
  • Client coupon emailing enablement
  • Email provider settings & credentials
  • Email sender name, subject, html & logo


Screenshots









Video demonstration