Automation to generate a Google Doc out of Google Sheet data, then convert it to PDF (apps script)

certificate_automation.js

function createDocument() {
  
  var headers = Sheets.Spreadsheets.Values.get('sheet fileID', 'range for headers');
  var tactics = Sheets.Spreadsheets.Values.get('sheet fileID', 'range for data');
  var templateId = 'doc fileID';
  
  for(var i = 0; i < tactics.values.length; i++){
    
    var studentName = tactics.values[i][0];
    var startDate = tactics.values[i][1];
    var endDate = tactics.values[i][2];
    var city = tactics.values[i][3];
    var creationDate = tactics.values[i][4];
    
    //Make a copy of the template file
    var documentId = DriveApp.getFileById(templateId).makeCopy().getId();
    
    //Rename the copied file
    DriveApp.getFileById(documentId).setName(studentName + ' - ' + 'Certificate of Completion');
    
    //Get the document body as a variable
    var body = DocumentApp.openById(documentId).getBody();
    
    //Insert the supplier name
    body.replaceText('{{ STUDENT NAME }}', studentName);
    body.replaceText('{{ START DATE }}', startDate);
    body.replaceText('{{ END DATE }}', endDate);
    body.replaceText('{{ CITY }}', city);
    body.replaceText('{{ CREATION DATE }}', creationDate);
    
    DocumentApp.openById(documentId).saveAndClose();
    
    //Make PDF copy at Drive Root
    var docFolder = DriveApp.getFileById(documentId).getParents().next().getId();
    var docName = DocumentApp.openById(documentId).getName();
    docblob = DocumentApp.openById(documentId).getAs('application/pdf');
    docblob.setName(docName + ".pdf");
    var file = DriveApp.createFile(docblob);
    var fileId = file.getId();
    moveFileId(fileId, docFolder);
  }

}

function moveFileId(fileId, toFolderId) {
   var file = DriveApp.getFileById(fileId);
   var source_folder = DriveApp.getFileById(fileId).getParents().next();
   var folder = DriveApp.getFolderById(toFolderId)
   folder.addFile(file);
   source_folder.removeFile(file);
}