Email Auto Login

Email Auto Login

Developed By Rubix Studios

Compatible with WHMCS v9.0

The Email Login addon for WHMCS enables clients to access and pay invoices through secure, time-limited login links delivered by email or embedded directly in PDF invoices. It removes the need for manual authentication during invoice payment, reduces friction in the billing process, and helps improve payment completion rates while retaining control through configurable expiration and usage limits.

Key Features

  • Secure Access: Cryptographically secure login links using HMAC-SHA256
  • Time-Limited: Configurable expiration (1-365 days, default 30 days)
  • Usage Limits: Optional click limits to prevent abuse (default 5, 0 = unlimited)
  • Auto-Invalidation: Links automatically expire when invoices are paid or cancelled
  • Email Integration: Seamless merge fields for email templates
  • PDF Integration: Optional "Pay Invoice" button in PDF invoices
  • Page Restrictions: Optional setting to restrict sessions to invoice pages only
  • Automatic Cleanup: Daily cron job removes expired links (30+ days old)

Security Features

  • HMAC-SHA256 key generation with secret key
  • Cryptographically secure random number generation
  • Invoice ownership verification
  • Session-based access control
  • Activity logging for audit trails

 

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Version Compatibility


Compatible with WHMCS v9.0

Full Version Compatibility


  • All versions of WHMCS v9.0
  • All versions of WHMCS v8.13

System Requirements


  • PHP 8.3+
  • IonCube 14

* Requirements listed are in addition to the WHMCS default system requirements.

Support for this product

The best place to start if you need help with a specific product is to contact the developer. All WHMCS Marketplace developers have both a website and support URL listed.

Developed By Rubix Studios

Changelog

v1.0 Released May 17th, 2026

Latest Version


  • Initial marketplace release
  • Secure email-based invoice login links
  • Time-limited access tokens with configurable expiration
  • Optional usage limits for login links
  • Automatic invalidation for paid or cancelled invoices
  • Email template merge field integration
  • PDF invoice payment link support
  • Optional invoice-only session restrictions
  • Activity logging and audit tracking
  • Automatic cleanup of expired login tokens
  • WHMCS 8.5+ compatibility
  • PHP 8.3+ support

 

See also

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MSG91 SMS/OTP Plugin

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SMS Manager

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SMSQ Notify

Send SMS Notification From WHMCS by SMSQ Notify

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