{"id":4227,"date":"2026-10-17T22:01:38","date_gmt":"2026-10-17T22:01:38","guid":{"rendered":"https:\/\/www.ucartz.com\/updates\/whmcs-9-1-beta-release-enhanced-billing-modern-ui-and-php-8-4-support\/"},"modified":"2026-10-17T22:01:41","modified_gmt":"2026-10-17T22:01:41","slug":"whmcs-9-1-beta-release-enhanced-billing-modern-ui-and-php-8-4-support","status":"publish","type":"post","link":"https:\/\/www.ucartz.com\/updates\/whmcs-9-1-beta-release-enhanced-billing-modern-ui-and-php-8-4-support\/","title":{"rendered":"WHMCS 9.1 Beta Release: Enhanced Billing, Modern UI, and PHP 8.4 Support"},"content":{"rendered":"<p>WHMCS has released version 9.1 as a <strong>Beta<\/strong>, marking a significant step forward in its ongoing development. This version introduces powerful features aimed at enhancing billing compliance, streamlining user experience, and ensuring compatibility with the latest technologies. While recommended for testing, this release brings substantial improvements for administrators and clients alike.<\/p>\n<h2>Key Features and Improvements in WHMCS 9.1<\/h2>\n<p>WHMCS 9.1 focuses on several core areas: bolstering billing accuracy with new immutability controls, modernizing the administrative interface, automating key processes, and enhancing payment gateway integrations. Support for PHP 8.4 is a major highlight, ensuring the platform remains current with web development standards.<\/p>\n<h3>Billing and Compliance Enhancements<\/h3>\n<ul>\n<li><strong>Invoice Immutability and Credit\/Debit Notes:<\/strong> Configure invoice locking behavior to meet compliance needs. Clients can now view and download credit\/debit notes with new PDF templates, while administrators gain dedicated sections for managing these notes and a new &#8220;Balance&#8221; column on invoices.<\/li>\n<li><strong>Improved Invoice Behavior:<\/strong> Adjustments have been made to how partial payments, credits, and refunds are handled, alongside restrictions on &#8220;Mark Unpaid&#8221; actions for greater accuracy.<\/li>\n<\/ul>\n<h3>Streamlined Operations and User Experience<\/h3>\n<ul>\n<li><strong>Unattended Automatic Updates:<\/strong> Schedule automatic installation of maintenance releases for self-hosted instances. This feature includes automatic backups, rollback capabilities on failure, and notifications, simplifying the update process.<\/li>\n<li><strong>New Iris Admin Area Theme (Preview):<\/strong> Experience a glimpse of the upcoming default admin theme, &#8220;Iris,&#8221; which offers a modernized design and improved navigation for a more intuitive user experience.<\/li>\n<li><strong>Automatic MarketConnect Account Registration:<\/strong> WHMCS 9.1 streamlines the setup process by attempting automatic MarketConnect account creation during upgrades and making it a mandatory step for new installations.<\/li>\n<li><strong>Setup Tasks Widget:<\/strong> A new widget on the Admin Dashboard helps track progress through essential setup tasks.<\/li>\n<li><strong>Enhanced Staff Online Menu:<\/strong> The menu now displays all enabled staff members and their last activity time, providing better visibility into team activity.<\/li>\n<li><strong>Admin Remember Me Sessions:<\/strong> The &#8220;Remember Me&#8221; functionality now supports independent sessions across multiple devices (up to five).<\/li>\n<\/ul>\n<h3>Payment and Technical Updates<\/h3>\n<ul>\n<li><strong>Stripe Dynamic Payments Enhancements:<\/strong> Seamlessly migrate stored payment methods from legacy Stripe modules. Authenticated clients can also utilize redirect payment methods (e.g., PayPal, Amazon Pay) via Stripe Dynamic Payments.<\/li>\n<li><strong>PHP 8.4 Support:<\/strong> WHMCS 9.1 officially supports PHP 8.4, requiring ionCube Loader 15.0.0. Ensure you upgrade ionCube Loader *before* updating to WHMCS 9.1, and then update WHMCS 9.1 *before* upgrading to PHP 8.4 to avoid critical issues.<\/li>\n<li><strong>BitPay Payment Gateway:<\/strong> Configuration has been updated to use BitPay&#8217;s current SDK, requiring a POS token instead of an API key.<\/li>\n<li><strong>Plesk XML API Protocol:<\/strong> The Plesk server module now requires XML API protocol version 1.6.9.1, necessitating Plesk Onyx 17.8+ or Plesk Obsidian 18.0+.<\/li>\n<li><strong>WP Toolkit Password Generation:<\/strong> For cPanel servers, WP Toolkit now handles the generation and management of WordPress admin passwords.<\/li>\n<li><strong>Expanded Sensitive Directory Check:<\/strong> The System Health check now includes verification of public readability for configured storage locations.<\/li>\n<li><strong>Nexus Cart Improvements:<\/strong> Service and addon upgrades are now directly visible in the Nexus cart, with options for clients to remove them.<\/li>\n<\/ul>\n<h3>Important Upgrade Requirements:<\/h3>\n<ul>\n<li><strong>ionCube\u00ae Loader:<\/strong> Minimum and Recommended: <strong>15.0.0<\/strong>. A critical warning advises upgrading to this version <em>before<\/em> updating to WHMCS 9.1.<\/li>\n<li><strong>MySQL\u00ae:<\/strong> Minimum: 5.2, Recommended: 8.0.<\/li>\n<li><strong>PHP:<\/strong> Minimum: 8.2, Recommended: 8.4. A critical warning advises updating WHMCS 9.1 <em>before<\/em> upgrading to PHP 8.4.<\/li>\n<\/ul>\n<h3>Deprecations:<\/h3>\n<ul>\n<li>Legacy Stripe Payment Gateway modules (Stripe, Stripe ACH, Stripe SEPA) are deprecated in favor of Stripe Dynamic Payments.<\/li>\n<li>Legacy invoice mutability configuration variables are deprecated, with their functionality now managed by the new &#8220;Invoice Immutability&#8221; setting.<\/li>\n<\/ul>\n<h3>For Developers:<\/h3>\n<ul>\n<li>The WHMCS REST API v2 now supports a complete headless checkout path.<\/li>\n<li>Updates to various libraries, including guzzlehttp\/promises and phpseclib, have been implemented.<\/li>\n<li>Several Laminas and `true\/punycode` libraries have been removed.<\/li>\n<li>Detailed template changes are available for Nexus, Twenty-One, Six themes, and the Standard Cart Order Form.<\/li>\n<\/ul>\n<p><strong>Note:<\/strong> WHMCS 9.1 is currently in Beta and intended for testing. Please ensure you have adequate backups before proceeding with any updates.<\/p>\n<hr>\n<h3>Resource Links:<\/h3>\n<ul>\n<li><a href=\"https:\/\/docs.whmcs.com\/Updating\" target=\"_blank\">How to Update WHMCS<\/a><\/li>\n<li><a href=\"https:\/\/docs.whmcs.com\/Database_Backups\" target=\"_blank\">How to Backup WHMCS<\/a><\/li>\n<li>Can&#8217;t update yourself? <a href=\"https:\/\/www.ucartz.com\/hire-an-expert\" target=\"_blank\">Hire an Expert from Ucartz<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>WHMCS has released version 9.1 as a Beta, marking a significant step forward in its ongoing development. This version introduces powerful features aimed at enhancing billing compliance, streamlining<\/p>\n","protected":false},"author":17,"featured_media":2547,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[769],"tags":[],"class_list":["post-4227","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-release"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>WHMCS 9.1 Beta Release: Enhanced Billing, Modern | Ucartz<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ucartz.com\/updates\/whmcs-9-1-beta-release-enhanced-billing-modern-ui-and-php-8-4-support\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"WHMCS 9.1 Beta Release: Enhanced Billing, Modern UI, and PHP 8.4 Support - Ucartz Updates\" \/>\n<meta property=\"og:description\" content=\"WHMCS has released version 9.1 as a Beta, marking a significant step forward in its ongoing development. 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Along with his support role, he write about security best practices, hosting infrastructure, and software management.","url":"https:\/\/www.ucartz.com\/updates\/author\/alexjoseph\/"}]}},"_links":{"self":[{"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/posts\/4227","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/users\/17"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/comments?post=4227"}],"version-history":[{"count":1,"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/posts\/4227\/revisions"}],"predecessor-version":[{"id":4228,"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/posts\/4227\/revisions\/4228"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/media\/2547"}],"wp:attachment":[{"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/media?parent=4227"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/categories?post=4227"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/tags?post=4227"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}