Backlinkseller (EN)
Brings your Backlinkseller advertising slots into the YOOtheme Pro page builder as an element · Version 2.7.5 · Stand 07.09.2026

Backlinkseller at a glance
What the extension does
The extension brings your Backlinkseller advertising slots into the YOOtheme Pro builder as an
element of its own. You place the element where the links are to appear and style it like any other
list in the builder — bullets, columns, spacing, link style.
Until now the slots had to be built in through a child theme or a custom template fragment. That
is no longer necessary: the extension is a plugin that registers itself with the builder.
  
The screenshots in this manual were taken on a German Joomla installation. The extension
  follows the language of your installation, so the labels appear in English on an English
  backend.
How the links reach the page
  
While the page is being built, the element asks the Backlinkseller service for the links
  intended for this exact page address.
  
The answer is taken apart: address, link text and the text before and after it are extracted
  from every entry.
  
The element outputs the entries as a list — in the style you set in the builder.
  
The result is cached so that not every page view triggers a new request. For how long is up
  to you.
What you need for it
  
An account at backlinkseller.de
  with an ID of your own
  
Joomla 6 and PHP 8.3
  
YOOtheme Pro 4.5 or 5.x as the active template
  
A child theme is not required. An existing one does no harm either.
What you can configure
The credentials live centrally in the plugin settings, not on the individual element: ID,
channel, cache lifetime and optionally a fixed page address. The appearance, by contrast, is set
per element in the builder — so you can present the same account differently on different
pages.
The details are under Plugin settings and
Using the element in the builder.
Important before you go live
The Backlinkseller service is contacted unencrypted, and every request transmits the visitor's IP
address and the requested page address to the service. Both have consequences for your privacy
policy. Please read Privacy and security before enabling this on
a public website.
Applies to version 2.7.5.
Deutsche Fassung

Requirements and installation
Requirements
  
Joomla: 6.0 or newer
  
PHP: 8.3 or newer
  
YOOtheme Pro: 4.5 or 5.x, installed and active as the site template
  
Backlinkseller account with an ID of your own
  
The extension works without Joomla's compatibility plugin. If you have enabled it for other
  reasons, that does no harm — it is simply not needed here.
Installation
  
Download the installation package 
plg_system_backlinkseller-x.y.z.zip from your
  customer account on graup-it.de.
  
In the Joomla backend, open System → Install → Extensions.
  
Drag the ZIP file into the upload area or select it via Browse.
On a first installation the plugin is enabled automatically. You will find it afterwards under
System → Plugins as System - Backlinkseller.
After the installation an overview panel appears showing the installed version and the entry
points to Getting started, Download key and Manual. After an update, the changelog takes the place
of "Getting started".
  
If the environment does not fit — Joomla too old, PHP too old — the installation stops with a
  clear message instead of leaving behind an extension that silently fails later.
After the installation
  
Enter your Backlinkseller ID in the plugin settings — see
  Plugin settings. Without it the element delivers nothing.
  
Clear the YOOtheme cache: YOOtheme → Settings → Advanced → Clear Cache.
  
Open a page in the builder — the element browser now shows the element
  Backlinkseller under Graup-IT:
  
  
Enter your download key for automatic updates — see
  Download key and updates.
Uninstalling
Uninstall the plugin via System → Manage Extensions. The extension creates no database
tables of its own; nothing is left behind. Elements you have placed in the builder lose their
output afterwards — remove them from the affected pages beforehand.
Applies to version 2.7.5.
Deutsche Fassung

Download key and updates
Backlinkseller receives updates through the official Joomla update mechanism. To allow your
website to fetch them, enter your personal download key once.
Entering the download key
  
Create your download key in your customer account on
  graup-it.de (menu item
  Download IDs). One key applies per website and covers all extensions obtained through it.
  
In the backend, open System → Update → Update Sites.
  
Open the entry Backlinkseller Updates and enter the key into the field Download
  Key.
  
Save.
  
Make sure to paste the key without leading or trailing spaces. A space copied
  along with it makes the update fail with an error message ("URL rejected" or "Package download
  failed").
Installing updates
  
Open System → Update → Extensions.
  
If a new version is available, Backlinkseller appears in the list. Select it and click
  Update.
  
Joomla downloads the package using your download key, verifies the checksum and installs the
  new version. Your settings and your builder layouts are preserved.
If Joomla finds no update although a new version exists, click Check for Updates first
to refresh the cache.
The manual route
You can also install any version by hand: download the ZIP and install it via System →
Install → Extensions, just like the first installation. An update through the package
overwrites the existing installation and keeps your settings.
Applies to version 2.7.5.
Deutsche Fassung

Plugin settings
The credentials live centrally in the plugin, not on the individual element. You find them under
System → Plugins in the entry System - Backlinkseller.
Backlinkseller ID
Your ID from
backlinkseller.de,
for example 
123456789.987654321. You find it in your Backlinkseller account.
Without it the element delivers nothing — in debug mode a corresponding notice
appears, in normal operation the slot simply stays empty.
Only digits and dots are accepted; everything else is discarded before the request.
Page URL (optional)
Backlinkseller assigns the links to a page address. Leave the field empty and
the extension reports the address actually being requested — that is the normal case and right for
most websites.
Enter a fixed address here only if all advertising slots are to be assigned to the same address
regardless of the page being viewed.
  
A fixed address applies to the whole website. If you place the element on several pages, they
  all report the same address to Backlinkseller — and receive the same links.
Backlinkseller channel
The channel determines which server the request goes to: 
channel1 through
channel9. The default is 
channel4. Change the value only if
Backlinkseller explicitly asks you to.
Cache time (seconds)
How long an answer once fetched is reused before asking again. Default: 300
seconds (5 minutes), permitted are 0 to 3600.
  
Higher value: fewer requests, faster page build, but changes at
  Backlinkseller take effect later.
  
0: switches the cache off. Then every page view asks again. Useful
  for testing only — in production it costs noticeable time.
The cache is shared by all visitors, not kept per visitor. It is keyed by ID, page address and
channel.
Debug mode
Shows the unprocessed answer of the service in the element, the entries derived from it and any
error messages. It also switches the cache off.
  
Switch it on for testing only, and off again afterwards. In debug mode visitors see technical
  output, and every page view triggers a request of its own.
What the element itself brings along
Everything to do with appearance — list type, bullets, columns, text style, link style,
separator — is set on the element in the builder, not here. See
Using the element in the builder.
Applies to version 2.7.5.
Deutsche Fassung

Using the element in the builder
Inserting the element
  
Open the page in the YOOtheme builder.
  
Add a new element and choose the group Graup-IT → Backlinkseller in the
  element browser.
  
Save the page and open it in the frontend — the links appear there.
  
Inside the builder you usually do not see the links: the request depends on the address of the
  page being viewed, and the preview has a different one. To check the setup there is test
  mode, see below.
Test mode
The switch Test mode on the element replaces the list of links with an overview of the
values arriving from the plugin settings: ID, channel, page address, cache lifetime and debug
state. If no ID is stored, it says so explicitly.
This is how you check whether the element sees the settings — without depending on a real answer
from the service. Switch it off again before publishing.
Appearance
The element follows the styling of the YOOtheme list element. You set:
  
Type: below each other (vertical) or side by side
  (horizontal).
  
Marker and Marker Color: bullet and its colour — for the
  vertical layout only.
  
Style and Size: dividers, stripes, font size.
  
Separator: the character between entries — for the horizontal layout only.
  The default is a comma followed by a space.
  
Columns, Columns Breakpoint and
  Divider: multi-column wrapping from a given screen width, optionally with a
  dividing line.
  
HTML Element: 
ul or 
ol. With the option next to it
  the list is additionally wrapped in a 
<nav> — useful if the links are meant to
  count as a navigation block.
  
Content Style and Link Style: text style of the entry and
  style of the link.
On top of that come the usual YOOtheme settings for spacing, width, alignment, animation and
visibility.
How an entry is put together
Backlinkseller usually delivers one link per entry with some text before or after it. The
extension separates the two and outputs them in this order: text before, link, text after. If an
entry contains no usable link, it appears as plain text.
Only the address, the link text and the attributes 
rel, 
target and
title are taken from the link. Everything else in the answer is discarded — that is a
security measure, see Privacy and security.
Several elements on one page
You can place the element more than once. All elements share the same plugin settings and
therefore the same request — so they show the same links, but they can be styled differently.
Applies to version 2.7.5.
Deutsche Fassung

Privacy and security
This page sums up what you as the operator need to know before the extension runs on a public
website. The points come from the security audit for version 2.7.0.
Which data leaves your server
Every request to the Backlinkseller service transmits:
  
your Backlinkseller ID
  
the page address being requested
  
the visitor's IP address
  
This is relevant under data protection law. An IP address is personal data.
  Include the transfer to Backlinkseller in your privacy policy and check whether you have a legal
  basis for it. This extension does not make that decision for you.
According to the imprint of backlinkseller.de the recipient is Intelions OÜ,
Pae 25-47, 11414 Tallinn, Estonia. Estonia is an EU member state — so this is not a transfer to a
third country. You need the name to identify the recipient in your privacy policy.
The IP address is taken from the connection itself and never read from request headers — it
therefore cannot be forged from outside.
Cache and IP address
The cache is keyed by ID, page address and channel, not by visitor. As long as
an answer sits in the cache, no request is made — and therefore no IP address is transmitted. A
higher cache time thus reduces the amount of data passed on.
Unencrypted connection
The request goes over 
http://. That is not negligence on the part of the extension
but a constraint of the service: the request servers 
channel1 through
channel9 accept unencrypted connections only — port 443 is not open
there, a connection attempt is refused. (The website backlinkseller.de itself is reachable over
https; the request servers are not.) The provider's own official integration code
addresses port 80 as well.
Whoever controls the connection in between could in theory alter the answer.
What such an interference could achieve is deliberately kept narrow. The extension does
not adopt the answer as HTML but reads out individual values on purpose:
  
Addresses are validated; only 
http and 
https are allowed.
  
javascript: and similar addresses are excluded.
  
Fixed lists of permitted values apply to 
rel and 
target.
  
All remaining text is stripped of any markup.
  
All output is escaped. Scripts, event attributes or embedded frames cannot reach the page
  this way.
  
The answer is limited to 100 KB and 100 entries.
A residual risk remains: an attacker in that position could substitute links
other than those Backlinkseller intended. As long as the service offers no TLS, that cannot be
ruled out from this side.
Availability
If the service does not answer, the extension tries a second address and then gives up. Each
attempt waits at most 5 seconds — so in the worst case the page build takes about 10
seconds longer.
Error responses are deliberately not cached, so that a disruption recovers by
itself as soon as the service is reachable again. The flip side: while the disruption lasts, every
page view pays that time.
  
If the service is unreachable for a longer period, take the element off the page temporarily
  or disable the plugin. Raising the time limit does not help — it limits the damage, it does not
  cause it.
What the extension does not do
  
It creates no database tables of its own and stores no visitor data.
  
It sets no cookies.
  
It fetches nothing as long as no element is placed on the page.
Applies to version 2.7.5.
Deutsche Fassung

Common questions and troubleshooting
The element does not appear in the builder
  
Is the plugin enabled under System → Plugins?
  
Is YOOtheme Pro active as the site template? Without YOOtheme the plugin has no effect — that
  is by design, not a malfunction.
  
Clear the YOOtheme cache: YOOtheme → Settings → Advanced → Clear Cache. The element
  browser is cached.
  
Look in the element browser under the group Graup-IT, not among the standard
  elements.
The element is there, but no links appear
Switch on test mode on the element and look at the page in the frontend. The overview
shows which values arrive.
  
"Not configured" for the ID: enter the Backlinkseller ID in the plugin
  settings.
  
ID is there, still no links: additionally switch on debug mode in the
  plugin. The cause then appears in plain text — see the next section.
  
Switch both off again after troubleshooting. Debug mode disables the cache, test mode replaces
  the list of links with the overview.
The messages in debug mode
  
"Backlinkseller ID is not configured": the ID is missing from the plugin
  settings.
  
"Could not connect to Backlinkseller": neither the German nor the
  international address answered within 5 seconds. Possible reasons: the service is disrupted, your
  server does not allow outgoing connections, or a firewall blocks port 80.
  
"Invalid response from the Backlinkseller server": an answer arrived, but not
  in the expected format. Check the ID and the channel.
The page shows different links than expected
Backlinkseller assigns the links to the page address reported to it. Check in test mode which
address is being reported. If a fixed page URL is set in the plugin, it applies to all
pages alike — clear the field so that every page reports its own address.
Changes at Backlinkseller take effect late
That is the cache. Wait out the configured cache time (default 5 minutes) or clear the Joomla
cache under System → Clear Cache.
The page builds noticeably more slowly
Most likely the service is not answering at the moment. Every request waits up to 5 seconds, and
there is a second attempt on a different address. Error responses are not cached so that the
situation recovers by itself — but while the disruption lasts, that costs time on every page view.
More on this under Privacy and security.
Also check whether the cache time was accidentally set to 
0 or debug mode is still
active — both switch the cache off.
Do I have to create a child theme?
No. The extension registers itself with the builder. An existing child theme does no harm
either.
Do I need the Joomla compatibility plugin?
No. The extension uses only interfaces that Joomla 6 provides without that plugin.
Does the extension work with Joomla 5?
No. From version 2.7.0 on, Joomla 6 and PHP 8.3 are required. On older installations the
installation stops with a notice instead of setting itself up and failing later.
Applies to version 2.7.5.
Deutsche Fassung

Changelog
This changelog lists every released version of Backlinkseller, the most recent first.
  
This page is generated automatically from the product's changelog file when a
  release is made. Changes made by hand are lost at the next synchronisation.
Version 2.7.5 – 16 August 2026
Fixed
  
The links in the overview panel always led to the German manual. They now follow the configured language.
Version 2.7.4 – 14 August 2026
Fixed
  
The notice in test mode still named the extension by its old name and therefore led to a settings page that no longer exists.
Language
  
The test mode display and the messages of the element always appeared in German. They now follow the configured language and are available in German and English.
Version 2.7.3 – 1 August 2026
Fixed
  
The link "Open manual" in the overview panel went through a redirect. It now points to the documentation directly.
Version 2.7.2 – 1 August 2026
Changed
  
In the extension manager the extension is now called "System - Backlinkseller"; the internal name suffix is gone. Nothing changes about its function or settings.
Version 2.7.1 – 1 August 2026
Fixed
  
New versions did not appear in the extension manager: the registration with the update server was missing from the package. Version 2.7.0 has to be updated by hand once.
Version 2.7.0 – 31 July 2026
Added
  
After an installation or update an overview panel appears with version, status and entry points to getting started, download key and manual.
  
The plugin is enabled automatically on a first installation.
  
The extension registers with the update server: new versions will appear in the extension manager directly.
  
The extension manager now shows the list of changes behind the version number.
  
The full licence text is now included; none was shipped before.
Changed
  
The extension is licensed under the GNU General Public License version 3 or later.
  
Internal rework onto the current Joomla extension pattern. Nothing changes for daily use.
  
The extension requires Joomla 6 and PHP 8.3 and runs without the compatibility plugin. On older installations the installation script stops with a clear message.
Fixed
  
The advertising slots would have stayed empty from Joomla 7 on: the answer of the Backlinkseller service was read in a way Joomla no longer offers.
Language
  
The messages shown during installation and update are available in German and English.
Version 2.6.0 – 6 June 2026
Notes
  
The state before the extension joined the shared workshop.
Deutsche Fassung