Create PDF File with DriveApp.createFile with results of UrlFetchApp.fetch - pdf

Question

I cannot create a PDF file in my Google Drive from content retrieved using UrlFetchApp.fetch
If I email the same file attached It arrives properly.
Here is my code:
var codigo ="1100016795766";
var url = "http://do.convertapi.com/Web2Pdf";
var headers = {"Content-Type":"multipart/form-data"
};
var payload= {"ApiKey":"xxxxxxxx",
"CUrl":"http://www.correos.cl/SitePages/seguimiento/seguimiento.aspx?envio="+codigo,
"LowQuality":true
}
var options = { "method":"POST",
"headers": headers,
"payload":payload,
"muteHttpExceptions":false
};
var pdf0=UrlFetchApp.fetch(url,options);
//trying several ways
var pdf=pdf0.getContent();
var pdf1=pdf0.getAs('application/pdf');
var pdf2=pdf0.getAs("application/pdf");
var pdf3=pdf0.getContentText();
//Trying several ways, none of them get a valid PDF file
DriveApp.createFile("8track_correos.pdf", pdf, 'application/pdf');
DriveApp.createFile("9track_correos.pdf", pdf0,'application/pdf');
DriveApp.createFile("1track_correos.pdf", pdf1, MimeType.PDF);
DriveApp.createFile("2track_correos.pdf", pdf1, MimeType.PDF);
DriveApp.createFile("4track_correos.pdf", pdf3);
DriveApp.createFile("7track_correos.pdf", pdf2);
DriveApp.createFile("6track_correos.pdf", pdf1);
//The attached file arrives as a good PDF file
MailApp.sendEmail("user#gmail.com", "prueba de enviar PDF", "k", {attachments:[{fileName:prefijo+p_nombre+p_apellido+"track_correos.pdf", content:pdf, mimeType:"application//pdf"}]});

Answer 1

The only createFile() configuration that allows a blob as the file source is:
DriveApp.createFile(blob);
So, you need to use:
var pdf0 = UrlFetchApp.fetch(url,options);
var pdf1 = pdf0.getAs('application/pdf');
var myNewFile = DriveApp.createFile(pdf1);
myNewFile.setName("track_correos.pdf");