HERE

Hello @nadenislamarre do you can add the SHIM On Off power switch to the list of supported power switches?
The product can be seen here - it's quite a cheap but very good working solution for small embedded systems.

I added some code to powerswitch.sh

# https://shop.pimoroni.com/products/onoff-shim/
onoffshim_start()
{
    # This is Button command (GPIO17 default)
    echo $1 > /sys/class/gpio/export
    echo in > /sys/class/gpio/gpio$1/direction

    power=$(cat /sys/class/gpio/gpio$1/value)
     [ $power -eq 0 ] && switchtype=1 #Sliding Switch
     [ $power -eq 1 ] && switchtype=0 #Momentary push button

    until [ $power -eq $switchtype ]; do
        power=$(cat /sys/class/gpio/gpio$1/value)
        sleep 1
    done

    # Switch off
    if [ "$?" = "0" ]; then
        touch "/tmp/poweroff.please"
        poweroff
    fi

}

onoffshim_stop()
{
    # Cleanup GPIO init
    for i in $*; do
        echo "$i" > /sys/class/gpio/unexport
    done
}

The function is called with onoffshim_$1 17 this device is a bit of "special" we need to add a dto-overlay to /boot/config.txt otherwise reboots won't be detected. So we need to add

dtoverlay=gpio-poweroff,gpiopin=4,active_low=1,input=1

it may be worth to check that line inside the onoff function and to add it to config.txt?