webcheckout: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/webcheckout - from package: myrepos

You may install the required package with command apt-get install {package}

Error in other languages:
webcheckout: bevel nie gevind nie
webcheckout: comandă negăsită
webcheckout: comando não encontrado
webcheckout: commande introuvable
webcheckout: command not found
webcheckout: käsku ei ole
webcheckout: không tìm thấy lệnh
webcheckout: komanda nerasta
webcheckout: Kommando nicht gefunden.
webcheckout: kommandot finns inte
webcheckout: komut yok
webcheckout: nie znaleziono polecenia
webcheckout: níor aimsíodh an t-ordú
webcheckout: no se encontró la orden
webcheckout: no s'ha trobat l'ordre
webcheckout: opdracht niet gevonden
webcheckout: parancs nem található
webcheckout: perintah tidak ditemukan
webcheckout: príkaz nenájdený
webcheckout: příkaz nenalezen
webcheckout: команда не найдена
webcheckout: командата не е открита
webcheckout: 命令找不到
webcheckout: コマンドが見つかりません