<script>

// ##############################################
// função loadScript para carregar script externo
// Lazy Loading Scripts
// ##############################################
function loadScript (url, classe) {
  let isLoaded = document.querySelectorAll(classe)
  // verifica se o script já foi caregado
  if (isLoaded.length > 0) {
    // não faz nada...
  } else {
    let myScript = document.createElement('script')
    myScript.src = url
    myScript.className = classe
    document.body.appendChild(myScript)
  }
}

loadScript('statics/directpayment.js', 'insert-script')
// ##############################################

export default {
...

@dobbel just to know if the script has already been loaded and not to load again by duplicating, can give another name

<script>

// ##############################################
// função loadScript para carregar script externo
// Lazy Loading Scripts
// ##############################################
function loadScript (url, classe) {
  let isLoaded = document.querySelectorAll(classe)
  // verifica se o script já foi caregado
  if (isLoaded.length > 0) {
    // não faz nada...
  } else {
    let myScript = document.createElement('script')
    myScript.src = url
    myScript.className = classe
    document.body.appendChild(myScript)
  }
}

loadScript('statics/directpayment.js', 'insert-script')
// ##############################################

export default {
...