withCredentials([sshUserPrivateKey(credentialsId: 'jenkins-ssh', keyFileVariable: 'identity', passphraseVariable: '', usernameVariable: 'userName')]) {
def host
host = [name: 'dev_new_wallets', host: "${variables.host_dev_mpb}", allowAnyHosts: true]
host.user = userName
host.identityFile = identity
host.allowAnyHosts = true
sshCommand remote: host, command: "systemctl stop ${repo}.service", sudo: true
sshPut remote: host, from: "${WORKSPACE}", into: '/opt/company/'
sshCommand remote: host, command: "/bin/npm run migrate --prefix /opt/company/${repo}", sudo: true
sshCommand remote: host, command: "systemctl start ${repo}.service", sudo: true
} 

Warning: A secret was passed to "sshPut" using Groovy String interpolation, which is insecure.
Affected argument(s) used the following variable(s): [userName]
See https://jenkins.io/redirect/groovy-string-interpolation for details. 

withCredentials([sshUserPrivateKey(credentialsId: 'jenkins-ssh', keyFileVariable: 'identity', passphraseVariable: '', usernameVariable: 'userName')]) { 
def host 
host = [name: 'dev_new_wallets', host: "${variables.host_dev_mpb}", allowAnyHosts: true] 
host.user = userName 
host.identityFile = identity 
host.allowAnyHosts = true 
sshCommand remote: host, command: "systemctl stop ${repo}.service", sudo: true sshPut remote: host, from: '/home/jenkins/agent/workspace/Dev/NewWallets/mpb-copy', into: '/opt/company/' 
sshCommand remote: host, command: "/bin/npm run migrate --prefix /opt/company/${repo}", sudo: true 
sshCommand remote: host, command: "systemctl start ${repo}.service", sudo: true }