Jenkins cURL with USERNAMEPASSWORD and Variable

gistfile1.txt

pipeline {
    agent {
        node {
           label 'master'
            customWorkspace "${JENKINS_HOME}/workspace/${JOB_NAME}/${BUILD_NUMBER}"
        }
    }
    stages {
        stage('HELLO') {
            steps {
                withCredentials([
                    string(credentialsId: 'secretText', variable: 'pwd1'),
                    usernameColonPassword(credentialsId:'key2', variable: 'USERPASS')
                    ]) {
                    script {
                       def json = readJSON(text: readFile("./output.json").trim())
                       json.results.each { result -> 
                            def DAT = result.name
                            sh "curl -sS -u"+ USERPASS + " https://myrepo.com/${DAT} -O"
                      }
                    }
                }
            }
        }
    }
}