We publish at least one improvement-packed update a month.

Latest MultiMerch version: 8.23.1 (released January 18, 2018)

Added MultiMerch's own order management interfaces for admins
Improved marketplace fee calculations (see blog post)
Improved order total handling for vendors
Improved the way validation of vendor categories, options and attributes works
Fixed a number of minor shipping system issues
Fixed Open Graph description missing from product pages
Fixed Stripe subscription configuration issue
Fixed a few minor issues
Fixed vendor profiles and product tabs in Journal 3

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And here’s the complete history of our past updates:

2018-11-23 Version 8.22

Added price-based vendor shipping mode
Added combined flat vendor shipping mode
Added per-product-only vendor shipping mode
Added a new category creation/management page
Added product filtering by manufacturer
Added product filters in vendor stores
Added simplified category listing mode
Improved shipping field management for admins
Improved shipping rule management for vendors
Improved shipping method selection at checkout
Improved primary category handling for SEO
Improved product publishing for digital marketplaces
Improved the appearance of product filters
Fixed language flags in text fields in single-language setups
Fixed sale invoice notifications to customers
Various bugfixes

2018-10-19 Version 8.21.2

Added a new core invoicing architecture
Added initial support for Journal3
Improved search indexing for product tabs
Improved the appearance of seller stores, profiles and filters
Fixed image removal on mobile devices
Fixed attribute sorting in product filters
Fixed PHP 7.x deprecated functions
Fixed global scope of notifications
Fixed minor registration issues
Fixed conversation participant types
Fixed various undefined variable issues
Fixed platform email headers
Fixed various minor issues
Fixed Basel integration issues

2018-09-13 Version 8.20

Introducing a multichannel notification system
Added support for Stripe Direct and Destination charges
Added a customer complaint/reporting system
Added holiday more for vendors
Added a setting to separate vendors from customers
Fixed vendor account redirects on login
Fixed a setting to disable category filters
Fixed MultiMerch product status relation to OpenCart status
Fixed amps and delimiters in the category filter
Fixed truncated product names in vendor dashboards

2018-07-24 Version 8.18

Introducing native faceted category filters
Fixed dataTable pagination
Fixed admin-area category list search
Fixed Stripe checkout non-numeric value error
Fixed a missing Stripe cert file
Fixed incorrect numbers in seller dashboard
Fixed dashboard performance issues
Fixed admin-area seller account creation
Various Basel and Journal integration fixes

2018-07-02 Version 8.17

Added a one page seller registration form
Added seller coupon support for guests
Improved seller account navigation
Fixed various minor issues

2018-06-20 Version 8.16

Added seller subscriptions/plans via Stripe
Added a new "List sellers" module
Fixed minor issues

2018-05-23 Version 8.15

Added automated payments via Stripe Connect
Fixed seller name display on product cards
Fixed special price formatting in admin product lists
Fixed date picker missing from the "date available" field
Fixed unavailable products being displayed in a few places
Fixed a few SSL links in the admin area
Fixed hash file with renamed admin folder
Fixed the display of deleted objects throughout the marketplace
Fixed a few missing translations
Fixed product counts in profile and store pages
Fixed manufacturer field missing from imports
Fixed undefined index token admin notice
Fixed UTF8 conversion for CSV import files
Fixed shipping cost column in seller order invoice
Fixed shipping address missing from admin order info with vendor shipping
Removed closing tags from language files

2018-05-03 Version 8.14.5

Added the display of seller information on product cards
Fixed the lise of seller orders not being displayed with coupons applied
Fixed special prices not displayed in seller and admin product lists
Fixed admin redirects when clicking on a conversation attachment
Fixed seller account profile nickname validation
Fixed seller coupons and options not being deleted on seller deletion
Fixed the display of deleted sellers and products throughout the marketplace
Fixed pagination issues in data tables
Fixed the coupon form with multilingual products
Fixed various minor issues and theme integration bugs

2018-04-13 Version 8.14.4

Added a confirmation dialog when deleting products from seller accounts
Improved the slugifier for SEO keyword generation
Fixed multiple "product purchased" emails to sellers
Fixed incorrect sales numbers being displayed in seller dashboards in some cases
Fixed product listing category selector in Safari
Fixed missing product listing form translations
Fixed the display of product prices with taxes on the shipping step at checkout
Fixed customer's selected shipping method missing from order information for admins
Fixed validation when creating attribute groups from seller accounts
Fixed payment method name bug in payment reports
Fixed the order date format in seller's order history
Fixed PayPal Adaptive displaying the IPN response to customers in some cases
Fixed third party quick checkouts redirecting customers back to cart in some cases
Fixed various minor issues and theme integration bugs
Fixed minor issues in the Russian translation

2018-03-31 Version 8.14.3

Added a single page to manage OpenCart and MultiMerch order statuses
Fixed product sorting in seller profiles
Fixed order currencies in customer accounts
Fixed pagination selectors in seller profiles and stores
Fixed missing heading tags in seller store pages
Fixed the MultiMerch slugifier to support UTF8 slugs
Fixed the default behavior of the product type selector for digital products
Fixed compatibility with resizing plugins by using OpenCart's resizer in seller profiles and stores
Fixed an incorrect display of order totals in customer and seller interfaces
Fixed product deletion from seller editing page
Fixed customer's selected shipping method not being displayed in order details
Fixed marketplace products not appearing in customer order lists
Fixed complete address not being used to display sellers on a map
Fixed a number of controller permissions
Fixed a missing JS include in customer conversation lists
Fixed seller transactions being generated incorrectly in some cases
Fixed quotes being incorrectly saved to product meta fields
Fixed an issue with admin-area datepickers preventing from clearing the data
Fixed various minor issues

2018-03-03 Version 8.14.2

Fixed seller-disabled products being displayed on some pages
Fixed undefined offset notices when editing badges
Fixed incorrect homepage link in admin breadcrumbs
Fixed missing base link in the MultiMerch image uploader
Fixed multilanguage badges and badge images on edit
Fixed adding related products when creating a new product
Fixed license activation for differing schemas
Fixed minor alert and button positions in seller accounts
Fixed meta title being overwritten in some cases when editing products
Fixed permissions for some seller account controllers
Fixed MultiMerch SEO not being cleared in some cases
Fixed MultiMerch seller order data not being deleted with deleting OpenCart orders
Fixed the way seller's total sales amounts are being calculated
Fixed category sorting in admin category lists
Fixed PayPal Adaptive with MultiMerch coupons
Fixed MultiMerch not sending notification emails at order creation

2018-01-25 Version 8.14

Added the new MultiMerch seller and admin dashboards
Added an option to display sellers on a map
Added Schema/OG microdata for improved SEO
Added caching of SEO data for improved performance
Improved the MultiMerch SEO controller compatibility
Improved seller profile and stores styling
Improved seller and product listing interfaces for admins
Fixed upgrade messaging when upgrading through multiple versions
Fixed order calculations when using seller coupons
Fixed specials not being saved due to thousands separators
Fixed permission issues when accessing admin reports
Fixed SEO URL exceptions for image uploads
Removed unneeded statuses for options and attributes

2017-12-18 Version 8.13

Added the new MultiMerch modification system core
Added the new MultiMerch event system core
Improved the MultiMerch library code structure (system/vendor cleanup)
Fixed coupon value input display bugs
Fixed incorrect order status name in seller's order info
Fixed seller payment conflicts with MultiMerch SEO
Fixed OpenCart category URLs with MultiMerch SEO
Fixed minor bugs with CSV imports
Fixed theme integration issues
Fixed the behavior of the seller category setting

2017-11-24 Version 8.12

Added new seller coupon system to let sellers create discount coupons
Improved admin interfaces for managing categories, attributes and options
Improved category selection for sellers with scrollable dropdowns
Fixed file uploaders for product imports and reviews on slower servers
Fixed seller history in admin order details
Fixed display discrepancies with different currencies on multi currency setups
Fixed missing pagination translations in admin interfaces

2017-11-01 Version 8.11.1

Improved shipping handling after checkout confirmation
Fixed downloads getting inadvertently deleted during product modification
Fixed SEO URLs for product pagination
Fixed SEO URL duplicates
Fixed licensing activation system responses

2017-10-23 Version 8.11

Added new system to handle logical order states
Added new payout system to group related invoices and payments
Added new admin interface for listing orders and suborders
Added new license activation system
Added new interface to check for updates
Added separate order statuses for vendors
Improved marketplace object deletion process for admins
Improved system information by listing xml, ocmod and modified core files
Improved payout and payment process handling for admins
Improved form submission error handling
Improved recursive category display performance
Improved handling of reviews for removed and reassigned products
Improved UX for dependent admin settings
Improved MultiMerch class and function autocompletion for PHPStorm
Improved theme integration pack versioning
Improved MultiMerch admin menu structure
Improved product category imports with a new input style setting
Improved MultiMerch review system UX by disabling duplicate OpenCart reviews
Improved free shipping handling by allowing it on a rule-level instead of globally
Fixed shipping autocomplete value on focusout
Fixed custom field display across admin accounts
Fixed shipping being not required for tangible products
Fixed abandoned Adaptive order payments not getting deleted
Fixed question, review and vendor interface issues for deleted customers
Fixed child category counter display for deleted categories
Fixed vendor SEO URL issues with empty base keyword
Fixed images being not required when creating badges
Fixed various minor issues with custom fields
Fixed various minor issues with order and suborder display
Fixed breadcrumbs on import pages (ThemeBurn)
Removed a number of deprecated admin settings

2017-09-04 Version 8.10

New MultiMerch SEO system
New SEOURL controller
New SEO slug and meta generator
New SEOURL template settings
New MultiMerch custom field system for products
Improved breadcrumbs in vendor accounts
Improved file upload handling
Fixed SEO fields for imports
Fixed vQmod+OCMOD conflicts in models
Fixed incomplete orders in dashboards and activity
Fixed product sold and earning numbers
Fixed combined shipping in checkout
Fixed dashboard layouts on smaller screens
Fixed titles in order-related conversations
Fixed select all bug in admin-area tables
Fixed some hardcoded language strings
Fixed space handling in numeric validation
Fixed Journal quick checkout bug with digital products
Fixed pay button appearing with no active invoices
Fixed ThemeBurn shipping dropdown styling
Fixed ThemeBurn z-index for shipping fields
Fixed various minor further issues

2017-08-01 Version 8.9.0.1

New admin dashboard
New vendor dashboard
Admin sales reports
Admin financial reports
Vendor sales reports
Vendor financial reports
Question/answer refactoring
Various bugfixes

2017-07-05 Version 8.8

Mass CSV product import for vendors
Marketplace activity list - tracking basic customer and seller activities
Various bugfixes

2017-06-08 Version 8.7.4.1

Minor bugfixes

2017-06-02 Version 8.7.4

MultiMerch Shipping improvements
Improved MultiMerch setup process
Various bugfixes

2017-05-25 Version 8.7.3.1

Debug improvement
Various style improvements
Various minor bug fixes

2017-05-15 Version 8.7.3

Review system improvements – image uploads, vendor response
Payment system / invoice updates
MultiMerch debug log
Bugfixes and improvements for attributes, options, and categories
Grouping menus in admin panel
Multimerch setting refactoring
Currency field display fixes
Various bugfixes

2017-04-14 Version 8.7.2.1

Various vendor option & category fixes
Fixed total category counts in getCategories
Suborder status display fix
Payment gateway template fix for OC < 2.3
Updated URL validation regex
Minor fixes for OC < 2.3
Various minor fixes

2017-04-06 Version 8.7.2

Order system refactoring
"View order details" improvements for admins, vendors and customers
Category commission fixes
Minor MultiMerch shipping fixes
Minor bugfixes

2017-03-28 Version 8.7.1

Messaging system restyling
Minor bugfixes

2017-03-23 Version 8.7

Added a system for vendors to create their own categories
Added admin interfaces for the private messaging system
It's now possible for customers and vendors to communicate directly from the "order details" page
It's now possible to attach files and images to private messages
It's now possible for admins to take part in vendor-customer conversations via private messages
Improved performance when loading vendor and product lists from the database
Fixed PayPal adaptive creating Pending orders before payment confirmation
Fixed PayPal Standard settings not saving Sandbox/Live selector
Fixed various PayPal Preapproval issues
Fixed override templates loading from incorrect path under specific circumstances
Fixed language selectors on vendor attribute/option pages
Fixed product name length validation with RTE enabled
Fixed related products autocomplete displaying the product being edited
Added an error message for vendors trying to purchase their own products
Various minor fixes

2017-03-03 Version 8.6.2

Added support for Preapproved payments for PayPal Adaptive
Fixed various issues related to PayPal Adaptive
Fixed various issues with the new option & attribute system
Fixed minor product publishing bugs
Fixed disqus_url variable validation
Improved language selector behavior

2017-02-24 Version 8.6.1.2

Added attribute creation and management for vendors
Added option creation and management for vendors
Fixed price fields being saved incorrectly on some languages
Fixed minor language-related bugs
Improved numeric validator function
Improved database upgrade messages

2017-02-17 Version 8.5.3.0

Fixed shipping methods not saved when no "Shipping from" value specified
Fixed account sidebar loading incorrect language strings
Fixed decimal/thousand separator bug in combined shipping settings
Fixed order total calculation in vendor order details and invoices
Added missing "intl" extension checks
Added price and images as default product fields
Added minimum order quantity product field

2017-02-13 Version 8.5.2.0

Fixed PayPal Adaptive checkout commission calculation
Fixed % coupon application to vendor balances
Replaced store default currency with customer's currency in "Shipping" checkout step
Added fixed coupon and voucher warning for multivendor carts
Fixed "required" field missing bug when saving specific product options
Fixed "file" type option values not being displayed to vendors in dashboard & order emails
Fixed "out of stock" status being set to 0 when field disabled – now using the first available status
Fixed "loading" button captions
Fixed missing translation strings in vendor accounts
Fixed incorrect status in "vendor account modified" emails to vendors
Replaced MultiMerch text strings with OpenCart ones in "customer" part of the Account sidebar module
Various minor fixes

2017-02-03 Version 8.5.1.1

Fixed commissions calculations in checkout
Fixed seller name display in order details
Fixed digital product publishing setting
Fixed minor language variable bugs
Added integration pack version to debug info
Added loading spinners to form submission buttons
Fixed setting image removal sprite (X) being displayed incorrectly on some themes

2017-01-27 Version 8.5

Fixed/base rate for combined shipping rules
Store's default weight measurement is now used in shipping rules
Extra admin controls for vendors
Possibility to remove payment requests and payments
Extra logging for payment gateways and transactions
Server error log output displayed in debug info when possible
Extra validation for shipping configuration and other inputs
Dimensions and weight can now be enabled/disabled separately
Various shipping system improvements
Various minor improvements
Various bugfixes

2017-01-18 Version 8.4.4.1

Category-based fees
Vendor group selection on signup
Multilanguage vendor descriptions
Vendor group settings
More controls over vendor product form
PayPal IPN debug
Allow digital products
Allow free products
Various bugfixes

2017-01-09 Version 8.3.0.4

Combined shipping improvements
Remove extra tables on uninstall
vQmod xml refactoring (productpage/hooks)
Minor fixes

2017-01-03 Version 8.3.0.2

Various bugfixes

2016-12-22 Version 8.3.0.1b

Plupload localization
OCStore support
Minor bugfixes

2016-12-14 Version 8.3.0.0b

New combined shipping system
Various shipping system changes
Minor bugfixes

2016-12-13 Version 8.2.0.11

Plupload is now stored locally
OCStore installation bugfix
Various bugfixes

2016-12-08 Version 8.2.0.8

File/image uploader progress bars
Fix permissions on install
Various bugfixes

2016-11-23 Version 8.2.0.5

Various bugfixes

2016-11-16 Version 8.2.0.4

Various vendor setting and review fixes
Vendor product sorting fixes
Suborder fix for mixed vendor orders
Added incompatible PHP version notification
Various minor bugfixes

2016-11-10 Version 8.2.0.3

Various product form fixes
Debug logs for payment gateways
Confirmation when deleting vendors and products
Various SEO fixes
PayPal IPN processing fixes

2016-11-05 Version 8.2.0.2

OC 2.3 compatibility for MultiMerch vendor modules
Product form enhancements

2016-11-01 Version 8.2

New payment system with plugin support for fees and payouts
PayPal Standard plugin
Bank Transfer plugin
PayPal Adaptive bugfixes
Messaging bugfixes
Social link fixes
Various bugfixes

2016-10-13 Version 8.1.5.2

Order total fix

2016-10-11 Version 8.1.5.0

OpenCart 2.3 compatibility
Shipping fixes
Various bugfixes

2016-10-09 Version 8.1.4.5

Various bugfixes

2016-08-18 Version 8.1.4.2

Minor fix for deleted categories
Minor bugfixes for missing vendor

2016-08-16 Version 8.1.4.0

Shipping support for PP Adaptive
Order product DB structure changes

2016-08-15 Version 8.1.3.0

SEO URL generator fixes
Language file cleanup
Shipping updates
Vendor balance fix
Language versioning

2016-08-09 Version 8.1.0.0

New multivendor shipping system
Minor bugfixes

2016-07-14 Version 8.0.1.4

Various bugfixes
Adaptive tax fix

2016-07-07 Version 8.0.1.2

Various bugfixes
Template redesign
Default limit changes
Product total fixes
vQmod fixes
CSS styling adjustments

2016-07-05 Version 8.0.0.4

Category selector redesign (multilevel category selector)
Review refactoring
Install/upgrade script updates
Minor bugfixes

2016-07-01 Version 8.0.0.3

Return updates
New rating/review system
Vendor profile redesign
Order status fixes
Template fixes
Styling fixes
Responsive tables
Tax caluclation fix
Template renderer fix

2016-06-14 Version 8.0.0.1

Base for vendor returns
Breadcrumb fixes
Controller refactoring
Attribute SQL fixes
Product question fixes
Dashboard fixes

2016-06-06 Version 8.0.0.0

New MultiMerch skeleton
Refactored class autoloader
Refactored models and controllers
Complete template design overhaul
New mailing system with template support
OpenCart 2.2 support
New template renderer
Class generator
Added product dimensions
Additional data selector
Product question system
Currency conversion fixes
Order total fixes
OCMOD compatibility

MultiMerch 7 for OpenCart 2.0

Multimerch 7.x was the first version of MultiMerch with support for OpenCart 2.

It introduced a full template redesign and controller overhaul to support OpenCart 2 and OCMOD.

MultiMerch 7 has been discontinued since 2016-06 with the release of MultiMerch 8.

2016-06-14 Version 7.7.5.1

Shipping updates
Minor fixes

2016-04-13 Version 7.7.5

Minor bugfixes
Vendor form updates

2016-03-18 Version 7.7.4

New validator class
Various bugfixes
Addon fixes

2016-03-07 Version 7.7.2

Indentation refactoring
Vendor profile modifications
Naming changes
Install/upgrade changes
Merged addon xmls
Setting refactoring
Data migration
Translations

2016-02-16 Version 7.6

Major refactoring
New vQmod hooks
MSUploader updates
File uploader modifications
Product form changes
Invoicing changes
Suborder modifications
CKEditor

2015-12-23 Version 7.3.1

Cleanup shipping/avatars
Configuration cleanup
Additional validation
Controllefix xml for 2.1
CSS styling fixes

2015-12-09 Version 7.2

Badge fixes
Redirect fixes
Installation / upgrade scripts
Refactoring mb_*

2015-10-29 Version 7.1.3

Mail fixes
vQmod refactoring
Suborder history
Vendor invoices
Interface restyling
Various validation
Vendor setting base
Filters

2015-06-20 Version 7.1.2

Social links
Suborders
New orderdata system
Addon > XT merge
Shipping fixes

2015-03-17 Version 7.1

Simple seller signup reverwite
Various OC2 fixes

2015-02-09 Version 7.0.2

Summernote
Banners
Bugfixes

2014-12-10 Version 7.0.1.2

Major OpenCart 2 conversion

MultiMerch 6 for OpenCart 1.5.x

MultiMerch 6 was the first version to offer a separate MultiMerch Core and a set of addons for extra functionality.

2014-08-11 Version 6.0

Major Core / Addon separation
Bugfixes

MultiMerch 5 for OpenCart 1.x

2014-07-16 Version 5.3

Suborder statuses

2014-06-26 Version 5.2

Interface redesign
Statistics
Bugfixes

2014-05-10 Version 5.0

Multivendor shipping system
Refactoring
Option updates
Bugfixes

MultiMerch 4

2014-02-07 Version 4.4

One page registration
Vendor ratings
PayPal MassPay
Simple payouts
Optimization
Bugfixes

2013-10-09 Version 4.2

New settings
Additional product fields
Product cloning
Bugfixes

2013-08-26 Version 4.1

New attributes
Vendor badges
New Rich Text Editor
Additional Translations
Vendor comments
Introducing DataTables
PayPal Adaptive
Various bugfixes
Messaging system

MultiMerch 3

2013-06-04 Version 3.0.1

Translations
SEO URL fixes
Bugfixes

2013-04-28 Version 3.0

New interfaces & icons
New listing / signup fee system
PayPal payments
New dashboard
Product form redesign
Various bugfixes

MultiMerch 2

2013-01-25 Version 2.2.1

Multiple languages
Payout updates
New uploader
Various bugfixes

2012-11-23 Version 2.0

Major controller rewrites
New autoloader
SEO URLs
Seller contact system
Admin area refactoring
Vendor groups
Commissions
Payouts / withdrawals
Permission system
Caching

MultiMerch 1

2012-07-11 Version 1.3

Various bugfixes

2012-06-01 Version 1.2

Various vendor modules
Bugfixes
Email notification system

2012-05-20 Version 1.1

Core module structures
Initial uploader
Basic transactions