diff --git a/.gitignore b/.gitignore
index 783a4ae..8f144f3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 *~
 *.sw[op]
+.DS_Store
diff --git a/manifest.toml b/manifest.toml
index 705618e..0704488 100644
--- a/manifest.toml
+++ b/manifest.toml
@@ -16,7 +16,8 @@ license = "GPL-3.0-or-later"
 code = "https://github.com/leonarf/FastAPI_ynh"
 
 [integration]
-yunohost = ">= 11.2.5"
+yunohost = ">= 11.2.18"
+helpers_version = "2.1"
 architectures = "all"
 multi_instance = true
 
@@ -52,6 +53,7 @@ ram.runtime = "50M"
     home = "/home/yunohost.app/__APP__"
 
     [resources.install_dir]
+    group = "www-data:r-x"
 
     [resources.data_dir]
     dir = "/home/yunohost.app/__APP__"
diff --git a/scripts/_common.sh b/scripts/_common.sh
index b377d6a..5cd177d 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -34,17 +34,16 @@ log_file="${log_path}/${app}.log"
 
 myynh_setup_python_venv() {
     # Always recreate everything fresh with current python version
-    ynh_secure_remove "$install_dir/venv"
-
-    chown -R "$app:$app" "$install_dir"
+    ynh_safe_rm "$install_dir/venv"
 
+    #REMOVEME? Assuming the install dir is setup using ynh_setup_source, the proper chmod/chowns are now already applied and it shouldn't be necessary to tweak perms | chown -R "$app:$app" "$install_dir"
     # Skip pip because of: https://github.com/YunoHost/issues/issues/1960
-    ynh_exec_as "$app" python3 -m venv --without-pip "$install_dir/venv"
+    ynh_exec_as_app python3 -m venv --without-pip "$install_dir/venv"
 
-    ynh_exec_as $app $install_dir/venv/bin/python3 -m ensurepip
+    ynh_exec_as_app $install_dir/venv/bin/python3 -m ensurepip
     # using --no-cache-dir option because user doesn't have permission to write on cache directory (don't know if it's on purpose or not)
-    ynh_exec_as $app $install_dir/venv/bin/pip3 install --no-cache-dir --upgrade wheel pip setuptools
-    ynh_exec_as $app $install_dir/venv/bin/pip3 install --no-cache-dir -r "$install_dir/requirements.txt"
+    ynh_exec_as_app $install_dir/venv/bin/pip3 install --no-cache-dir --upgrade wheel pip setuptools
+    ynh_exec_as_app $install_dir/venv/bin/pip3 install --no-cache-dir -r "$install_dir/requirements.txt"
 }
 
 myynh_setup_log_file() {
@@ -68,7 +67,7 @@ myynh_fix_file_permissions() {
         chmod -c o-rwx "$data_dir"
 
         # /var/www/$app/
-        chown -c -R "$app:" "$install_dir"
-        chmod -c o-rwx "$install_dir"
+        #REMOVEME? Assuming the install dir is setup using ynh_setup_source, the proper chmod/chowns are now already applied and it shouldn't be necessary to tweak perms | chown -c -R "$app:" "$install_dir"
+        #REMOVEME? Assuming the install dir is setup using ynh_setup_source, the proper chmod/chowns are now already applied and it shouldn't be necessary to tweak perms | chmod -c o-rwx "$install_dir"
     )
 }
diff --git a/scripts/backup b/scripts/backup
index 84a71f7..cd95780 100755
--- a/scripts/backup
+++ b/scripts/backup
@@ -1,53 +1,44 @@
 #!/bin/bash
 
-#=================================================
-# GENERIC START
-#=================================================
-# IMPORT GENERIC HELPERS
-#=================================================
-
 # Keep this path for calling _common.sh inside the execution's context of backup and restore scripts
 source ../settings/scripts/_common.sh
 source /usr/share/yunohost/helpers
 
-#=================================================
-# DECLARE DATA AND CONF FILES TO BACKUP
-#=================================================
-ynh_print_info --message="Declaring files to be backed up..."
+ynh_print_info "Declaring files to be backed up..."
 
 #=================================================
 # BACKUP THE APP MAIN DIR
 #=================================================
 
-ynh_backup --src_path="$install_dir"
+ynh_backup "$install_dir"
 
 #=================================================
 # BACKUP THE DATA DIR
 #=================================================
 
 # Only relevant if there is a "data_dir" resource for this app
-ynh_backup --src_path="$data_dir" --is_big
+ynh_backup "$data_dir"
 
 #=================================================
 # BACKUP THE NGINX CONFIGURATION
 #=================================================
 
-ynh_backup --src_path="/etc/nginx/conf.d/$domain.d/$app.conf"
+ynh_backup "/etc/nginx/conf.d/$domain.d/$app.conf"
 
 #=================================================
 # BACKUP LOGROTATE
 #=================================================
 
-ynh_backup --src_path="/etc/logrotate.d/$app"
+ynh_backup "/etc/logrotate.d/$app"
 
 #=================================================
 # BACKUP SYSTEMD
 #=================================================
 
-ynh_backup --src_path="/etc/systemd/system/$app.service"
+ynh_backup "/etc/systemd/system/$app.service"
 
 #=================================================
 # END OF SCRIPT
 #=================================================
 
-ynh_print_info --message="Backup script completed for $app. (YunoHost will then actually copy those files to the archive)."
+ynh_print_info "Backup script completed for $app. (YunoHost will then actually copy those files to the archive)."
diff --git a/scripts/change_url b/scripts/change_url
index 65a653e..58705d0 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -1,45 +1,35 @@
 #!/bin/bash
 
-#=================================================
-# GENERIC STARTING
-#=================================================
-# IMPORT GENERIC HELPERS
-#=================================================
-
 source _common.sh
 source /usr/share/yunohost/helpers
 
-#=================================================
-# STANDARD MODIFICATIONS
 #=================================================
 # STOP SYSTEMD SERVICE
 #=================================================
-ynh_script_progression --message="Stopping a systemd service..." --weight=1
+ynh_script_progression "Stopping $app's systemd service..."
 
-ynh_systemd_action --service_name=$app --action="stop" --log_path="/var/log/$app/$app.log"
+ynh_systemctl --service=$app --action="stop"
 
 #=================================================
 # MODIFY URL IN NGINX CONF
 #=================================================
-ynh_script_progression --message="Updating NGINX web server configuration..." --weight=1
+ynh_script_progression "Updating NGINX web server configuration..."
 
-ynh_change_url_nginx_config
+ynh_config_change_url_nginx
 
-ynh_script_progression --message="Updating systemd service..." --weight=1
+ynh_script_progression "Updating systemd service..."
 
-ynh_add_systemd_config
+ynh_config_add_systemd
 
-#=================================================
-# GENERIC FINALISATION
 #=================================================
 # START SYSTEMD SERVICE
 #=================================================
-ynh_script_progression --message="Starting a systemd service..." --weight=1
+ynh_script_progression "Starting $app's systemd service..."
 
-ynh_systemd_action --service_name=$app --action="start" --log_path="/var/log/$app/$app.log"
+ynh_systemctl --service=$app --action="start"
 
 #=================================================
 # END OF SCRIPT
 #=================================================
 
-ynh_script_progression --message="Change of URL completed for $app" --last
+ynh_script_progression "Change of URL completed for $app"
diff --git a/scripts/config b/scripts/config
index 0bffb37..a274ff5 100644
--- a/scripts/config
+++ b/scripts/config
@@ -1,36 +1,30 @@
 #!/bin/bash
-# In simple cases, you don't need a config script. 
+# In simple cases, you don't need a config script.
+
+# With a simple config_panel.toml, you can write in the app settings, in the
 
-# With a simple config_panel.toml, you can write in the app settings, in the 
 # upstream config file or replace complete files (logo ...) and restart services.
 
-# The config scripts allows you to go further, to handle specific cases 
+# The config scripts allows you to go further, to handle specific cases
+
 # (validation of several interdependent fields, specific getter/setter for a value,
 # display dynamic informations or choices, pre-loading of config type .cube... ).
 
-#=================================================
-# GENERIC STARTING
-#=================================================
-# IMPORT GENERIC HELPERS
-#=================================================
-
 source /usr/share/yunohost/helpers
 
-ynh_abort_if_errors
+#REMOVEME? ynh_abort_if_errors
 
 #=================================================
 # RETRIEVE ARGUMENTS
 #=================================================
 
-install_dir=$(ynh_app_setting_get --app=$app --key=install_dir)
-data_dir=$(ynh_app_setting_get --app=$app --key=data_dir)
+install_dir=$(ynh_app_setting_get --key=install_dir)
+data_dir=$(ynh_app_setting_get --key=data_dir)
 
 #=================================================
 # SPECIFIC SETTERS FOR TOML SHORT KEYS
 #=================================================
 
-#=================================================
-# GENERIC FINALIZATION
 #=================================================
 
 ynh_app_config_apply() {
@@ -41,25 +35,25 @@ ynh_app_config_apply() {
     # Set new password
     if [ ! "$password" == "" ]
     then
-        ynh_print_info --message="Changing password for user ${app}"
+        ynh_print_info "Changing password for user ${app}"
         chpasswd <<< "${app}:${password}"
     fi
 
-    ynh_script_progression --message="Stopping a systemd service..." --weight=1
-    ynh_systemd_action --service_name=$app --action="stop" --log_path="/var/log/$app/$app.log"
+    ynh_script_progression "Stopping $app's systemd service..."
+    ynh_systemctl --service=$app --action="stop"
 
     # Symbolic link to main app folder
     if [ ! "$main_folder" == "FastAPIAppFolder" ]
     then
-        ynh_print_info --message="Deleting $data_dir/FastAPIAppFolder"
+        ynh_print_info "Deleting $data_dir/FastAPIAppFolder"
         rm -rf "$data_dir/FastAPIAppFolder"
-        ynh_print_info --message="Creating symbolic link to folder ${main_folder}"
+        ynh_print_info "Creating symbolic link to folder ${main_folder}"
         ln -s "$data_dir/$main_folder" "$data_dir/FastAPIAppFolder"
     fi
 
     if [ ! "$requirements_path" == "" ]
     then
-        ynh_print_info --message="Installing python custom requirements"
+        ynh_print_info "Installing python custom requirements"
         # Enable python virtual environnement
         source $install_dir/venv/bin/activate
 
@@ -67,8 +61,9 @@ ynh_app_config_apply() {
         pip install -r $data_dir/$requirements_path
     fi
 
-    ynh_script_progression --message="Starting a systemd service..." --weight=1
-    ynh_systemd_action --service_name=$app --action="start" --log_path="/var/log/$app/$app.log"
+    ynh_script_progression "Starting $app's systemd service..."
+    ynh_systemctl --service=$app --action="start"
+
 }
 
 ynh_app_config_run $1
diff --git a/scripts/install b/scripts/install
index 2a58011..f0eea63 100755
--- a/scripts/install
+++ b/scripts/install
@@ -1,86 +1,78 @@
 #!/bin/bash
 
-#=================================================
-# GENERIC START
-#=================================================
-# IMPORT GENERIC HELPERS
-#=================================================
-
 source _common.sh
 source /usr/share/yunohost/helpers
 
 #=================================================
 # SETTINGS
 #=================================================
-ynh_script_progression --message="Storing installation settings..."
+ynh_script_progression "Storing installation settings..."
 
 # Logging:
 log_file="/var/log/$app/$app.log"
-ynh_app_setting_set --app=$app --key=log_file --value="$log_file"
+ynh_app_setting_set --key=log_file --value="$log_file"
 
 #=================================================
 # SETUP LOG FILE
 #=================================================
-ynh_script_progression --message="Setup logging..."
+ynh_script_progression "Setup logging..."
 
 myynh_setup_log_file
 
 # Use logrotate to manage application logfile(s)
-ynh_use_logrotate --logfile="$log_file" --specific_user=$app
+ynh_config_add_logrotate "$log_file"
 
 #=================================================
 # PYTHON VIRTUALENV
 #=================================================
-ynh_script_progression --message="Create and setup Python virtualenv..." --weight=45
+ynh_script_progression "Create and setup Python virtualenv..."
 
-ynh_add_config --template="requirements.txt" --destination="$install_dir/requirements.txt"
+ynh_config_add --template="requirements.txt" --destination="$install_dir/requirements.txt"
 
 myynh_setup_python_venv
 
 #=================================================
 # copy config files
 # ================================================
-ynh_script_progression --message="Create $app configuration files..."
+ynh_script_progression "Create $app configuration files..."
 
-ynh_add_config --template="gunicorn.conf.py" --destination="$install_dir/gunicorn.conf.py"
+ynh_config_add --template="gunicorn.conf.py" --destination="$install_dir/gunicorn.conf.py"
 
 mkdir -p "$data_dir/FastAPIAppFolder"
-ynh_add_config --template="__init__.py" --destination="$data_dir/FastAPIAppFolder/__init__.py"
-ynh_app_setting_set --app=$app --key=main_folder --value="FastAPIAppFolder"
-ynh_app_setting_set --app=$app --key=requirements_path --value=""
+ynh_config_add --template="__init__.py" --destination="$data_dir/FastAPIAppFolder/__init__.py"
+ynh_app_setting_set --key=main_folder --value="FastAPIAppFolder"
+ynh_app_setting_set --key=requirements_path --value=""
 
 # Add the password to this user
 chpasswd <<< "${app}:${password}"
 
-#=================================================
-# GENERIC FINALIZATION
 #=================================================
 # SECURE FILES AND DIRECTORIES
 #=================================================
-ynh_script_progression --message="Set file permissions..."
+ynh_script_progression "Set file permissions..."
 
 myynh_fix_file_permissions
 
 #=================================================
 # NGINX CONFIGURATION
 #=================================================
-ynh_script_progression --message="Configuring NGINX web server..."
+ynh_script_progression "Configuring NGINX web server..."
 
-ynh_add_nginx_config
+ynh_config_add_nginx
 
-ynh_add_systemd_config
+ynh_config_add_systemd
 
 yunohost service add $app --description="Gunicorn running a FastAPI app" --log="/var/log/$app/$app.log"
 
 #=================================================
 # Start the app server via systemd
 #=================================================
-ynh_script_progression --message="Starting systemd service '$app'..." --weight=5
+ynh_script_progression "Starting systemd service '$app'..."
 
-ynh_systemd_action --service_name=$app --action="start" --log_path="$log_file"
+ynh_systemctl --service=$app --action="start" --log_path="$log_file"
 
 #=================================================
 # END OF SCRIPT
 #=================================================
 
-ynh_script_progression --message="Installation of $app completed" --last
+ynh_script_progression "Installation of $app completed"
diff --git a/scripts/remove b/scripts/remove
index 75d26e9..e35d071 100755
--- a/scripts/remove
+++ b/scripts/remove
@@ -1,38 +1,33 @@
 #!/bin/bash
 
-#=================================================
-# GENERIC START
-#=================================================
-# IMPORT GENERIC HELPERS
-#=================================================
-
 source _common.sh
 source /usr/share/yunohost/helpers
 
 #=================================================
 # REMOVE SYSTEM CONFIGURATIONS
 #=================================================
-# REMOVE SYSTEMD SERVICE 
+# REMOVE SYSTEMD SERVICE
+
 #=================================================
-ynh_script_progression --message="Removing system configurations related to $app..." --weight=1
+ynh_script_progression "Removing system configurations related to $app..."
 
 # This should be a symetric version of what happens in the install script
 
 # Remove the service from the list of services known by YunoHost (added from `yunohost service add`)
-if ynh_exec_warn_less yunohost service status $app >/dev/null
+if ynh_hide_warnings yunohost service status $app >/dev/null
 then
-	ynh_script_progression --message="Removing $app service integration..." --weight=1
+	ynh_script_progression "Removing $app service integration..."
 	yunohost service remove $app
 fi
 
-ynh_remove_systemd_config
+ynh_config_remove_systemd
 
-ynh_remove_nginx_config
+ynh_config_remove_nginx
 
-ynh_remove_logrotate
+ynh_config_remove_logrotate
 
 #=================================================
 # END OF SCRIPT
 #=================================================
 
-ynh_script_progression --message="Removal of $app completed" --last
+ynh_script_progression "Removal of $app completed"
diff --git a/scripts/restore b/scripts/restore
index b9cb9f5..f7c822e 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -1,11 +1,5 @@
 #!/bin/bash
 
-#=================================================
-# GENERIC START
-#=================================================
-# IMPORT GENERIC HELPERS
-#=================================================
-
 # Keep this path for calling _common.sh inside the execution's context of backup and restore scripts
 source ../settings/scripts/_common.sh
 source /usr/share/yunohost/helpers
@@ -13,63 +7,63 @@ source /usr/share/yunohost/helpers
 #=================================================
 # RESTORE THE NGINX CONFIGURATION
 #=================================================
-ynh_script_progression --message="Restoring the NGINX web server configuration..." --weight=1
+ynh_script_progression "Restoring the NGINX web server configuration..."
 
-ynh_restore_file --origin_path="/etc/nginx/conf.d/$domain.d/$app.conf"
-ynh_systemd_action --service_name="nginx" --action="reload"
+ynh_restore "/etc/nginx/conf.d/$domain.d/$app.conf"
+ynh_systemctl --service="nginx" --action="reload"
 
 #=================================================
 # RESTORE THE APP MAIN DIR
 #=================================================
-ynh_script_progression --message="Restoring the app main directory..." --weight=1
+ynh_script_progression "Restoring the app main directory..."
 
-ynh_restore_file --origin_path="$install_dir"
+ynh_restore "$install_dir"
 rm $install_dir/gunicorn.pid
 
 #=================================================
 # RESTORE THE DATA DIRECTORY
 #=================================================
-ynh_script_progression --message="Restoring the data directory..." --weight=1
+ynh_script_progression "Restoring the data directory..."
 
-ynh_restore_file --origin_path="$data_dir" --not_mandatory
+ynh_restore "$data_dir"
 
-ynh_script_progression --message="Set file permissions..."
+ynh_script_progression "Set file permissions..."
 myynh_fix_file_permissions
 
 #=================================================
 # PYTHON VIRTUALENV
 # Maybe the backup contains a other Python version
 #=================================================
-ynh_script_progression --message="Create and setup Python virtualenv..." --weight=45
+ynh_script_progression "Create and setup Python virtualenv..."
 
 myynh_setup_python_venv
 
 #=================================================
 # RESTORE SYSTEMD
 #=================================================
-ynh_script_progression --message="Restoring the systemd $app configuration..."
+ynh_script_progression "Restoring the systemd $app configuration..."
 
-ynh_restore_file --origin_path="/etc/systemd/system/$app.service"
+ynh_restore "/etc/systemd/system/$app.service"
 systemctl enable $app.service --quiet
-ynh_systemd_action --service_name=$app --action="start" --log_path="$log_file"
+ynh_systemctl --service=$app --action="start" --log_path="$log_file"
 
 #=================================================
 # INTEGRATE SERVICE IN YUNOHOST
 #=================================================
-ynh_script_progression --message="Integrating service in YunoHost..."
+ynh_script_progression "Integrating service in YunoHost..."
 
 yunohost service add $app --description="Gunicorn running a FastAPI app" --log="/var/log/$app/$app.log"
 
 #=================================================
 # RESTORE THE LOGROTATE CONFIGURATION
 #=================================================
-ynh_script_progression --message="Setup logging..."
+ynh_script_progression "Setup logging..."
 
 myynh_setup_log_file
-ynh_restore_file --origin_path="/etc/logrotate.d/$app"
+ynh_restore "/etc/logrotate.d/$app"
 
 #=================================================
 # END OF SCRIPT
 #=================================================
 
-ynh_script_progression --message="Restoration completed for $app" --last
+ynh_script_progression "Restoration completed for $app"
diff --git a/scripts/upgrade b/scripts/upgrade
index 1892674..02f0ffd 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -1,81 +1,72 @@
 #!/bin/bash
 
-#=================================================
-# GENERIC START
-#=================================================
-# IMPORT GENERIC HELPERS
-#=================================================
-
 source _common.sh
 source /usr/share/yunohost/helpers
 
-upgrade_type=$(ynh_check_app_version_changed)
-
 #=================================================
 # STOP SYSTEMD SERVICE
 #=================================================
-ynh_script_progression --message="Stopping a systemd service..." --weight=1
+ynh_script_progression "Stopping $app's systemd service..."
 
-ynh_systemd_action --service_name=$app --action="stop" --log_path="/var/log/$app/$app.log"
+ynh_systemctl --service=$app --action="stop"
 
 #=================================================
 # SETUP SYSTEMD
 #=================================================
-ynh_script_progression --message="Configuring systemd service '$app'..." --weight=5
+ynh_script_progression "Configuring systemd service '$app'..."
 
-ynh_add_systemd_config --service=$app --template="systemd.service"
+ynh_config_add_systemd
 
 #=================================================
 # PYTHON VIRTUALENV
 #=================================================
-ynh_script_progression --message="Create and setup Python virtualenv..." --weight=45
+ynh_script_progression "Create and setup Python virtualenv..."
 
-ynh_add_config --template="requirements.txt" --destination="$install_dir/requirements.txt"
+ynh_config_add --template="requirements.txt" --destination="$install_dir/requirements.txt"
 
 myynh_setup_python_venv
 
 #=================================================
 # copy config files
 # ================================================
-ynh_script_progression --message="Create $app configuration files..."
+ynh_script_progression "Create $app configuration files..."
 
-ynh_add_config --template="gunicorn.conf.py" --destination="$install_dir/gunicorn.conf.py"
+ynh_config_add --template="gunicorn.conf.py" --destination="$install_dir/gunicorn.conf.py"
 
 #=================================================
 # SETUP LOGROTATE
 #=================================================
-ynh_script_progression --message="Upgrading logrotate configuration..."
+ynh_script_progression "Upgrading logrotate configuration..."
 
 # Use logrotate to manage app-specific logfile(s)
-ynh_use_logrotate --logfile="$log_file" --specific_user=$app --non-append
+ynh_config_add_logrotate "$log_file"
 
 #=================================================
 # SECURE FILES AND DIRECTORIES
 #=================================================
-ynh_script_progression --message="Set file permissions..."
+ynh_script_progression "Set file permissions..."
 myynh_fix_file_permissions
 
-
 #=================================================
 # REAPPLY SYSTEM CONFIGURATIONS
 #=================================================
-ynh_script_progression --message="Upgrading system configurations related to $app..." --weight=1
+ynh_script_progression "Upgrading system configurations related to $app..."
 
-ynh_add_nginx_config
+ynh_config_add_nginx
 
-ynh_add_systemd_config
+ynh_config_add_systemd
 
 yunohost service add $app --description="Gunicorn running a FastAPI app" --log="/var/log/$app/$app.log"
 
 #=================================================
 # START SYSTEMD SERVICE
 #=================================================
-ynh_script_progression --message="Starting a systemd service..." --weight=1
+ynh_script_progression "Starting $app's systemd service..."
 
-ynh_systemd_action --service_name=$app --action="start" --log_path="/var/log/$app/$app.log"
+ynh_systemctl --service=$app --action="start"
 
 #=================================================
 # END OF SCRIPT
 #=================================================
 
-ynh_script_progression --message="Upgrade of $app completed" --last
+ynh_script_progression "Upgrade of $app completed"