How to Start Selling on MC999
- Shop Hub
- Flea Market
- Services
Here you can find answers to the most important questions and a detailed guide to trading on the MC999.
1.1 As a guest, you can browse and search all listings in the application, and you may also add items to your cart. However, registration is required to check out, contact sellers, or create your own listings.
1.2 You can register as a Buyer/Private Seller to create listings for your personal or pre-owned items and explore listings of items you may wish to purchase.
1.3 You can register as a Business Seller for advanced commercial listings. Business Sellers can create listings manually or import them from an integrated e-shop.
1.4 To create an account, click the “Sign In” / “Create Account” button located in the top-right corner of the header.
1.5 Select Create Personal Account to register as a Buyer/Private Seller. This account is intended for users who wish to find items or services they intend to purchase. As a Private Seller, you can also create and publish your own listings in the Flea Market and Services divisions.
1.6 Select Create Business Account to register as a Business Seller. This account allows you to create and manage listings in the ShopHub, Flea Market, and Services divisions.
2.1 Enter your email address to create your login and set a password that meets the specified security requirements.
2.2 A confirmation link will be sent to your email address. Click the link to verify your email and activate your account.
2.3 After the account is created, you will be redirected to your profile page where you may provide additional information.
2.4 You may choose “Skip for now” and complete this information later.
2.5 If the profile page is not completed before you attempt to publish your first listing, the system will prompt you to provide the required details before the listing can be published.
2.6 The following information must be provided before your first item can be listed: name, address, and phone number. Providing a WhatsApp number is optional but recommended to facilitate communication between buyers and sellers.
2.7 Users registered as Buyers/Private Sellers may list their personal or pre-loved items in the Flea Market division and offer services in the Services division. The number of active listings available depends on the subscription plan selected.
2.8 Users can also create an account via Gmail.
2.9 To create a Personal Account with Google, select “Create Personal Account with Google” located at the bottom of the “Create Personal Account” page.
3.1 Provide your email address to create your account and set a password that meets the specified requirements.
3.2 A confirmation link will be sent to your email address. Click the link to verify your email and activate your account.
3.3 After the account is created, you will be redirected to your profile page where you may enter additional information.
3.4 You may choose “Skip for now” and complete this information at a later time.
3.5 If the profile page is not completed before you attempt to publish your first listing, the system will prompt you to provide the required details before the listing can be published.
3.6 You can complete your profile information page by entering your company registration number and verifying your phone number. Providing a WhatsApp number is optional but recommended to facilitate communication between buyers and sellers.
3.7 When you enter your company registration number in the designated field, the system will automatically populate the relevant company information, including the business name and registered address.
3.8 Once your company registration number is successfully verified, the corresponding information will appear in your About Seller section and will be marked as Verified.
3.9 You can also create your account via Gmail or via Shopify.
3.10 To create a Business Account with Shopify, select “Create Business Account with Shopify” located at the bottom of the “Create Business Account” page.
3.11 To create a Business Account with Google, select “Create Business Account with Google” located at the bottom of the “Create Business Account” page.
4.1 You may also choose to register without verifying a Company Registration Number.
4.2 Enable this option by selecting to register with “Manually” Button.
4.3 You will then be asked to manually enter your company name and address.
4.4 If you register without Company Registration Number verification, the Company Reg. Number is verified label will not appear in your About Seller section.
5.1 Entering and verifying a mobile phone number is required. WhatsApp number is optional but recommended to facilitate communication between buyers and sellers.
5.2 You may provide one or two phone numbers and link one of them to WhatsApp.
5.3 A verification code will be sent via SMS to the provided number(s). Enter the code in the verification form to confirm.
Sellers can list items on MC999 in three ways:
6.1 Integrate with Your E-Commerce Store: Connect platforms like Shopify and import selected products into MC999. Items stay synced, and buyers are redirected to your external store for checkout. Available for ShopHub division.
6.2 Bulk Import for Direct Sales : Upload items in bulk and sell them via MC999’s direct communication channels (chat, phone, WhatsApp). Feature in development.
6.3 Create Listings Directly on MC999: Manually create listings within MC999 and sell them through the same direct communication channels. The “Create Listing” button is available across the app for easy access.
7.1 Start the Integration
7.1.1 Go to your Business Account and select the E-Shop Integration tab.
7.1.2 Click Add Shop and select your active e-commerce platform (Shopify, Shopline, or BigCommerce).
7.1.3 Install the MC999 App
7.1.4 You will be redirected to the selected platform’s App Store on the MC999 installation page.
7.1.5 Click Install and follow the on-screen instructions.
7.1.6 On the e-platform’s installation page, review the data that will be shared with MC999 and confirm to proceed.
7.1.7 Platform-Specific Process
7.1.8 The integration process varies slightly depending on the platform.
7.2 Shopify Integration
7.2.1 Install MC999: E-Shop Hub Embedded Sales Channel in your Shopify store.
7.2.2 After installation:
7.2.3 All your Shopify products will be automatically published on MC999.
7.2.4 Your e-shop will appear in the integration list with the status “Integrated.”
7.2.5 Our AI feature automatically categorises integrated listings into the most appropriate category and subcategory. However, you can manually adjust the placement of your listings if needed.
7.2.6 Placing Products in the ShopHub Structure
7.2.7 Go to My Listing in your MC999 account.
7.2.8 Select the products you want to categorise.
7.2.9 Click Placement in ShopHub.
7.2.10 A pop-up will display the full catalogue structure.
7.2.11 Choose the appropriate section, category, and subcategory (the node and end-point), then apply.
7.2.12 All selected items will then be placed in the structure accordingly. This ensures buyers can find your items through both search and catalogue browsing. Dynamic filters based on the product parameters within this node will also be available to add to your products.
7.2.13 Important Notes for Shopify
7.2.14 Items imported from Shopify cannot be edited directly on MC999.
7.2.15 All data synchronises with your Shopify store, and checkout takes place on your Shopify site via cart permalink.
7.2.16 Products published from Shopify cannot be deleted from MC999—only from your Shopify store.
7.3 Shopline & BigCommerce Integration
7.3.1 After installation, the e-shop appears in your list with status “Integrated.”
7.3.2 Products are not automatically published.
7.3.3 To publish products:
7.3.4 Use the Importing tab in your MC999 account.
7.3.5 Export your product data from your e-shop and import it into MC999 (as described in the Importing Products section).
8.1 If you don’t already have a shop on one of the supported e-commerce platforms, you can create one by using the link shown in the header under “Create E-Shop.”
8.2 You can also list products manually on MC999 by clicking the “Create Listing” button, available throughout the site.
9.1 Click the “Detach” button to remove the E-Shop integration. Products previously imported from this shop will remain in the database but will no longer synchronise.
9.2 Click the “Integrate” button to enable the E-Shop integration. All products imported from this E-Shop will then synchronise automatically.
10.1 E-Shop names are generated automatically by the system during integration with e-commerce platforms. However, you can modify them at any time.
10.2 Click the “Edit” text button next to the E-Shop you want to update.
10.3 Enter the new name in the popup window. The name must be unique and cannot be left empty.
10.4 Click “Save” to apply your changes.
11.1 Open the E-platform App Store.
11.2 Locate the MC999 application (listed in the Marketplace section).
11.3 Click Add App.
11.4 You will be redirected to the MC999 page.
11.5 Click the Add Application button.
11.6 The system will display a list of your accounts on the selected E-platform — choose one and sign in.
11.7 The system will then show all Shops associated with that account — select the Shop you want to integrate with MC999.
11.8 You will be redirected to the E-platform page to review and grant access permissions. By clicking Install App, you agree to the required data access and start the integration process.
11.9 To complete the integration, you must be logged in to MC999 as a Seller. If not, a popup will appear prompting you to sign in or complete a Business Registration.
11.10 Log in as a Seller or complete the business registration.
11.11 Once logged in as a Seller, the integration will automatically finish — your E-Shop is now added and integrated.
All currencies are automatically converted.
13.1 Your E-Shop statuses: Not integrated, Integrated, Blocked.
13.2 In case you change the currency in your E-Shop after it is integrated. And the currency is not recognized by the MC999, your E-Shop will have a blocked status:
13.2.1 change currencies to the recognized one and refresh the page - the status changes to “integrated”
14.1 To detach an integration, click the “Detach” button (available only for the e-shops currently integrated in your list).
14.2 After detaching an e-shop, all products will remain in MC999, but they will no longer sync and the checkout function will be disabled.
14.3 Once you integrate the e-shop again, both synchronisation and the checkout function will be restored for all products.
15.1 Only e-shops with the status “Not Integrated” can be deleted from your list.
15.2 When you delete an e-shop, the system will ask whether you want to delete all related products or keep them in your MC999 database as manually added products.
15.2.1 If you choose to keep the products, they will no longer synchronise with the e-shop and will lose the checkout option.
15.2.2 Buyers will still be able to see them, but they will need to contact you directly to make a purchase.
16.1 Our marketplace is organised into the following hierarchy:
1st Level – Divisions: ShopHub, Flea Market, and Services
(Automarket, Property, and Food coming soon)
2nd Level – Sections:
Each Division is divided into multiple Sections.
3rd Level – Categories:
Each Section contains Categories. In the Services division, Categories are the final (leaf) level.
4th Level – Subcategories:
In the ShopHub and Flea Market divisions, each Category contains Subcategories.
16.2 Please note that the entire structure is currently hardcoded. At this stage, you cannot request the creation of new Subcategories. If you are unable to find a suitable place for your listing, please use the “Other” Section within the appropriate Division.
17.1 The process of publishing (importing) products from integrated E-Shops varies by platform.
17.2 Shopify
17.2.1 Install MC999: E-Shop Hub Embedded Sales Channel in your Shopify store.
17.2.2 After installation, all existing products will be automatically published on MC999, and your e-shop will appear in the list with the status “integrated.”
17.2.3 Important notes for Shopify:
17.2.4 All Shopify products will automatically be placed in the most appropriate section and sub-section on MC999. You can change the placement of your listing at any time.
To place your listing in a desired catalogue structure:
17.2.5 Go to My Listing.
17.2.6 Select the desired products.
17.2.7 Click Placement in ShopHub.
17.2.8 In the pop-up window, choose the section → category → subcategory (node/end-point).
17.2.9 Apply your selection.
17.2.10 The chosen items will now appear in the appropriate catalogue location. Buyers can find them not only via cross-search but also by browsing the catalogue. Dynamic filters based on product parameters will also become available.
17.2.11 Items imported from Shopify cannot be edited directly in MC999. They are fully synchronised with your Shopify database and maintain checkout functionality.
17.2.12 Buyers will be redirected to your Shopify site with a cart permalink, and the cart will be recognised on your store.
17.2.13 Shopify products cannot be deleted from MC999. Deletions must be done directly in Shopify.
17.3 Shopline and BigCommerce
17.3.1 After installation, your e-shop will appear with the status “integrated.”
However, product publishing is manual and must be done via the Importing tab in your MC999 account.
17.3.2 You must export your products from your e-shop and import them into MC999 as described in the “Importing Products” section.
17.3.3 Placement of Items in Divisions
17.3.4 You can manage item placement in two areas:
17.3.5 Business Account → Importing Tab: Assign items to the division structure before importing.
17.3.6 My Listings: Adjust item placement within the current division structure.
17.3.7 Note: Changing placement clears all product details.
17.3.8 Steps
17.3.9 Select one or more items and click “Placement in Division.”
17.3.10 A popup “Placement in ” appears.
17.3.11 Choose the target directory and end-point, then select Apply to place the items.
17.4 Import from E-Shop Flow
17.4.1 In the Import from E-Shop popup, you can pre-skip products or undo previously skipped products before starting the import.
17.4.2 Click the Import button in the popup. Only items that are assigned within the Division hierarchy will be imported into your MC999 database.
17.4.3 All items imported from the E-Shop will be synchronised automatically with the E-Shop database whenever changes occur.
17.4.4 During subsequent imports, the system automatically prevents duplicate entries because each item’s external ID is stored and remains unique.
17.4.5 All imported items are initially saved in the MC999 database with the status Draft.
17.4.6 You can change item statuses to Archived or Active only from within the MC999 page.
18.1 “Create Listing” buttons appear throughout the app. Click the button and complete the item form to publish your listing.
18.1.1 Business users: the “Create Listing” button in the ShopHub division opens a form to create a listing in ShopHub, while the “Create Listing” button in the Flea Market division opens a form to create a listing in Flea Market.
18.1.2 Individual users: both buttons open the Flea Market listing form.
18.2 Select leaf node: category and subcategory.
18.3 Enter a title and description, and select or create a brand.
18.4 Add images or video; the first image becomes the main display image.
18.5 Upload up to four extra PDF or Excel documents.
18.6 Use existing SKU and parameter options from the same node or create new ones.
18.7 Use existing parameter values or add new ones.
18.8 Parameters marked with a filter icon create dynamic showroom filters for that Catalogue node.
18.9 Administrators manage and standardise parameters and values for consistency.
18.10 Administrators choose which parameters appear in showroom filters.
18.11 Business items publish to the ShopHub; private items publish to the Flea Market. Both share the same structure and parameters, allowing seamless filter switching between divisions.
18.12 Private listings (FleaMarket) can include a PayPal link for direct sales.
18.13 Business listings (ShopHub) can include Amazon and eBay links for price comparison.
18.14 Manually created listings are managed separately in each division and sold through the outside communication channels provided during MC999 registration.
- If you don’t have any shops on the e-platform, you can create one by following the link embedded in the corresponding e-platform logo on this page.
20.1 MC999 listings can have three statuses:
20.1.1 Draft (default): Visible only to the owner.
20.1.2 Active: Visible to all users.
20.1.3 Archived: Old or unused listing, visible only to the owner.
20.2 All listings—whether created manually or imported—are saved as Draft by default. You can change their status to Active or Archived.
20.3 The system allows you to have as many Active listings as permitted by your current subscription plan.
20.4 If you attempt to activate more listings than your plan allows, the system will notify you and suggest upgrading your subscription.
20.5 If your subscription plan is paused, blocked, or unpaid, all your Active listings will automatically revert to Draft. Once your account is reactivated (unpaused, unblocked, or paid), the previous statuses will be restored automatically.
20.6 If you downgrade your subscription and the number of your Active listings exceeds the new limit, all listings will be set to Draft. You will then need to manually activate listings up to the allowed limit.
20.7 If you reduce the number of Active listings in advance so that you are within your new plan’s limit, downgrading will not affect the Active status of your remaining listings.
21.1 You can create, update, and delete slots for your Services listings in the Slots Scheduler only with a VIP subscription.
21.2 Access to the Scheduler is available from the following pages:
21.2.1 Open your Business Account → My Listings tab → Services, then click the “+ Create a slot” text icon on the corresponding row. The system will redirect you to the Scheduler with the current ad pre-selected. You can choose another listing from the dropdown menu directly within the Scheduler.
21.2.2 Open the Item Page and click the “Slots” text icon. The system will redirect you to the Scheduler showing only the slots for that specific listing.
21.3 You can also open the Scheduler from the showroom; however, in this case you can only view slots for your listings that match the current showroom filters.
22.1 You can create, update, or delete Service Slots in the scheduler for the next 30 days only.
22.2 Click Create to open the right-hand panel and enter slot details.
22.3 Click an empty space in the event grid to open the panel with a preset start time.
22.4 Standard shortcuts (Ctrl+X, Ctrl+C, Ctrl+V) are supported.
22.5 Set the start and end date/time by:
22.5.1 Typing them manually
22.5.2 Using the date/time pickers
22.5.3 Clicking within the events grid
22.5.4 Resizing an existing slot
23.1 Flea Market Listings – Map Integration Rules
23.1.1 Identity Verification for Private Listings
If a user posts a private listing without providing a verified phone number/WhatsApp or a published address, the system will prompt them to complete verification before the listing is published.
23.1.2 Map-Based Listing Display
Every listing posted in the Flea Market will appear as a marker on the interactive map. Purchases are made through direct contact with the seller.
23.1.3 Address Privacy Option
Users may choose to hide their address from being shown as text in their profile or listing.
However, the listing will still be represented by a location marker on the map.
23.1.4 Interactive Map Features
The map will display markers for all listings available in the showroom.
23.1.5 Marker Pop-Ups
Selecting a marker will open the corresponding listing in a pop-up window for quick viewing.
24.1 Service listings are created manually in MC999 and contain almost the same fields as the ShopHub, except for SKU parameters.
24.2 Service listings do not support synchronisation or checkout functionality.
24.3 You can change the status of the listing at any time, either immediately or later within your listing.
24.4 Once the listing is set to active, it will appear in the showroom and can be found through cross-search.
24.5 Place your listing within the Services category structure.
24.6 Enter a title for your listing.
24.7 Add a description in HTML format.
24.8 Include media such as images and video. The first image will be displayed as the main image for the listing.
24.9 You may upload up to four additional documents in PDF or Excel format.
25.1 We provide a permalink where you can create and download your CV.
25.2 You can attach your CV to the listing.
26.1 An interactive map within the application allows users to view addresses.
26.2 By default, the address associated with your account is applied to your service listings.
26.3 You can assign a specific address to each services listing by either entering the address or placing a marker at the desired location on the interactive map.
27.1 The price will be shown on your services listing page with the prefix “from”.
27.2 Alternatively, you may choose to display the option “Price negotiable”.
27.3 You may add an unlimited number of parameters to your services listing, including both database and custom parameters.
28.1 All parameters will be displayed on the listing page.
28.2 Parameters marked with a “filter” icon will also be available as filtering options in the services showroom.
28.3 We have pre-created several parameters that are useful for service listings, including: contract type, recruiter type, working hours, job level, and language.
28.4 These parameters automatically generate corresponding dynamic filters in the showroom for all service nodes.
28.5 The system administrator will review any custom parameters and values you create, and may choose to make some of them available to other users.
28.6 The administrator can also mark parameters with the filter icon to enable them as showroom filter options.
29.1 You can manage your service listings in your account under the “Manage My Listings” tab / Services.
29.2 The available options include activating or deactivating the listing, deleting it, previewing it, copying it, editing it, or adding slots.
30.1 Both business and private service listings have access to the interactive services slot scheduler.
30.2 You can create individual or group slots for the upcoming month by clicking the Create button or by selecting an empty space in the calendar.
31.1 Unreserved slots can be rescheduled or updated either from the right-hand panel or directly within the field.
31.2 You can reschedule using drag-and-drop or by resizing the slot. Use Ctrl+C to copy, Ctrl+V to paste, and Ctrl+X to delete.
31.3 If a slot contains one or more reservations, you must remove (abolish) all reservations before making any changes.
32.1 You can cancel individual reservations or all reservations.
32.2 Your customers will receive a notification of the cancellation, including the reason you provide.
33.1 Expired slots will be deleted automatically by the system.
34.1 Service slots are available through the Services Showroom.
34.2 Registered users can browse service listings in the showroom and filter them by location and other parameters.
34.3 Users can view all service slots associated with their filtered search results in the showroom and further refine them in the scheduler.
34.4 Registered users can also access the slot scheduler directly from the corresponding service listing.
35.1 Users can reserve a slot online and become customers, or they may cancel their reservation at any time.
35.2 The slot owner will receive a notification for every reservation and cancellation.
35.3 Fully reserved slots will remain visible only to customers and the owner, and will be displayed in green.
35.4 Customers and owners can monitor the number of free spots remaining in group slots and can view each other’s contact details.
35.5 Customers may update the number of additional participants in a group slot, provided they do not exceed the maximum number of remaining free spots.
35.6 Group slot customers can adjust the number of additional participants from within their account, under Slots → My Services Slots, but not beyond the available free spots.
35.7 Slot owners can monitor the number of reservations in group slots, view the list of customers and their contact details, and contact them directly.
35.8 Group slot owners can update the maximum number of participants, but they cannot reduce the limit below the number of reservations already made.
36.1 Summary information about your reservations (where you are a customer) and your slots (where you are the owner) is available in your account.
36.2 This feature is accessible regardless of whether you are a business or individual user.
36.3 The number of active Slots is always visible on the “My Services Slots” sub-tab for Slot Customer in his user account.
35.4 The number of active Reservations is always visible on the “My Reservations” sub-tab - for the Slot Customer in his user account.
35.5 The number of active Reservations and Slots together is visible on the “Slots” Main Tab in the User Account.
37.1 If a user places a private services Listing and has not verified their phone number/WhatsApp or published their address, the system will prompt them to do so in advance. Each services Listing will be displayed on the map.
37.2 User account owners can choose to hide their address from being displayed as text; however, the Listing will still have a related marker on the map.
37.3 The interactive map will feature markers for all Listings in the showroom. Clicking on a marker will open the related Listing in a popup.
37.4 Hovering over the Listing tile in the showroom will highlight the corresponding marker on the map.
38.1 All user roles can compare items in the app. The number of added items is displayed next to the Compare option, which is visible in the header on every page.
38.2 Supported Sections. The Compare feature is available across all divisions: Shops Hub, Flea Market, Services.
38.3 Adding Items for Comparison. Users can add an unlimited number of items to the Compare list from Showroom, Item Profile pages, Cart.
38.4 Items added to the Compare list are marked with a checked checkbox.
38.5 To remove an item: Uncheck its checkbox, or Click the × icon directly in the Compare List
39.1 Smart Comparison Lists. The system automatically generates separate comparison lists for each placement endpoint, ensuring that only items with matching attributes are compared.
39.2 By clicking on the x next to the End-point tag, each of the Compare List can be removed totally with one click.
39.2 Improved Usability. For a cleaner comparison view, users can hide attributes with identical values across all items in the list.
39.2 Click the × icon directly in the Compare List removes the Item from it.
MC999 Marketplace is fully optimized for mobile devices. Simply open mc999.co.uk in your smartphone's browser, and the interface will automatically adjust to your screen. For even greater convenience, you can add the app icon to your home screen and launch it just like a native app.
Key Features at Your Fingertips:
🛍️ Full-Featured Marketplace
- Browse Products & Services: An intuitive catalog with sections, categories, and subcategories. Use filters and sorting to find what you need quickly.
- Item & Service Pages: All the details you need, photo galleries, and seller contacts are always handy.
- Showrooms: Explore and compare Goods of business and individual sellers directly from your phone.
- Map Search: Find listings and services near you (in available sections).
📦 Manage Your Listings
- Create Ads: Post new listings in the "ShopHub," "Services," and "Flea Market" sections right from your mobile device.
- Add Media: Easily upload photos for your items from your phone gallery or use a phone camera.
- Full Ad Management: View your list of ads, change their status, delete, copy, preview, and edit them directly from your mobile device.
- Create & Edit Ads: Post new listings and easily edit existing ones in the "ShopHub," "Services," and "Flea Market" sections.
- Media Management: Upload photos, create image SKUs, and add media from URLs to make your listings stand out.
- Track Performance: Monitor your active products and see which of your items have been added to other users' carts.
👤 Your Personal Account
- Registration & Login: Quick sign-up for buyers and sellers, with password recovery.
- Profile Management: Edit your settings for both business and personal accounts.
- Orders: View your cart history
💼 Tools for Service Providers
- Services -Booking Scheduler (SBS): View your schedule in Day, Week, or Agenda view. Manage your time slots.
📅 Service Booking & Management
For Customers: Easily find and book available slots for services. Manage your bookings by rescheduling, canceling, or adding guests to your event directly from your mobile device.
⭐ Personal Space
- Cart : Add items to your cart and save favorite listings for quick access.
- Compare Products: Use the comparison feature to make the best choice.
- Notifications: Stay informed about all important updates.
🛠️ Support
- Get help in a dedicated section, tailored for buyers, sellers, and guests.
MC999
|All Rights Reserved
|Company Number: 14618615
|Address:
|Email: admin@mc999.co.uk
|VAT: Not VAT registered
||