diff --git a/hetzner.yaml b/hetzner.yaml
index 85fa2c8..2418bb8 100644
--- a/hetzner.yaml
+++ b/hetzner.yaml
@@ -7,6 +7,7 @@
   tasks:
     - name: Backup hetzner
       block:
+        - include_vars: vars/common/variable.yaml
         - include_vars: vars/hetzner/secret.yaml
         - include_vars: vars/hetzner/variable.yaml
 
@@ -68,19 +69,21 @@
 
         - name: Inform Mattermost about success
           uri:
-            url: https://cs-mm.ddnss.de/hooks/og4ckuqet7fafb8kjuaigzuh7c
+            url: "{{ mattermost_url }}"
             validate_certs: no
             method: POST
             body_format: json
             body:
+              username: "{{ mattermost_user }}"
               text: "{{ ansible_date_time.date }} {{ ansible_date_time.time }} (info): Playbook ran successful ({{ ansible_play_name }})"
 
       rescue:
         - name: Inform Mattermost about error
           uri:
-            url: https://cs-mm.ddnss.de/hooks/og4ckuqet7fafb8kjuaigzuh7c
+            url: "{{ mattermost_url }}"
             validate_certs: no
             method: POST
             body_format: json
             body:
+              username: "{{ mattermost_user }}"
               text: "{{ ansible_date_time.date }} {{ ansible_date_time.time }} (info): Playbook ran with error ({{ ansible_play_name }})"
diff --git a/odroid.yaml b/odroid.yaml
index 85e0478..44dd9e4 100644
--- a/odroid.yaml
+++ b/odroid.yaml
@@ -7,6 +7,7 @@
   tasks:
     - name: Backup odroid
       block:
+        - include_vars: vars/common/variable.yaml
         - include_vars: vars/odroid/secret.yaml
         - include_vars: vars/odroid/variable.yaml
 
@@ -202,17 +203,19 @@
 
         - name: Inform Mattermost about success
           uri:
-            url: https://cs-mm.ddnss.de/hooks/og4ckuqet7fafb8kjuaigzuh7c
+            url: "{{ mattermost_url }}"
             method: POST
             body_format: json
             body:
+              username: "{{ mattermost_user }}"
               text: "{{ ansible_date_time.date }} {{ ansible_date_time.time }} (info): Playbook ran successful ({{ ansible_play_name }})"
 
       rescue:
         - name: Inform Mattermost about error
           uri:
-            url: https://cs-mm.ddnss.de/hooks/og4ckuqet7fafb8kjuaigzuh7c
+            url: "{{ mattermost_url }}"
             method: POST
             body_format: json
             body:
+              username: "{{ mattermost_user }}"
               text: "{{ ansible_date_time.date }} {{ ansible_date_time.time }} (info): Playbook ran with error ({{ ansible_play_name }})"
diff --git a/semaphore.yaml b/semaphore.yaml
index 7db6502..4b9fdc8 100644
--- a/semaphore.yaml
+++ b/semaphore.yaml
@@ -7,6 +7,7 @@
   tasks:
     - name: Cleanup semaphore
       block:
+        - include_vars: vars/common/variable.yaml
         - include_vars: vars/semaphore/variable.yaml
 
         - name: Search for volume's backup directories
@@ -122,17 +123,19 @@
 
         - name: Inform Mattermost about success
           uri:
-            url: https://cs-mm.ddnss.de/hooks/og4ckuqet7fafb8kjuaigzuh7c
+            url: "{{ mattermost_url }}"
             method: POST
             body_format: json
             body:
+              username: "{{ mattermost_user }}"
               text: "{{ ansible_date_time.date }} {{ ansible_date_time.time }} (info): Playbook ran successful ({{ ansible_play_name }})"
 
       rescue:
         - name: Inform Mattermost about error
           uri:
-            url: https://cs-mm.ddnss.de/hooks/og4ckuqet7fafb8kjuaigzuh7c
+            url: "{{ mattermost_url }}"
             method: POST
             body_format: json
             body:
+              username: "{{ mattermost_user }}"
               text: "{{ ansible_date_time.date }} {{ ansible_date_time.time }} (info): Playbook ran with error ({{ ansible_play_name }})"
diff --git a/vars/common/variable.yaml b/vars/common/variable.yaml
new file mode 100644
index 0000000..cea24d1
--- /dev/null
+++ b/vars/common/variable.yaml
@@ -0,0 +1,2 @@
+mattermost_url: https://cs-mm.ddnss.de/hooks/og4ckuqet7fafb8kjuaigzuh7c
+mattermost_user: semaphore