Download PDF from URL in Excel VBA

[reasem]

looking to download a PDF from a URL. I can't seem to get past the login screen as the pdf that is downloaded only contains the code for the login page if I open it in NotePad. I examined the post request after logging in manually and pasted it after "FormData." I'm not sure if it matters what I called this variable? In one of the posts I reference below, he used "strAuthenticate."

When I examine the pdf that I want to download in chrome DevTools, it says this:

<embed id="plugin" type="application/x-google-chrome-pdf"                                 
src="***SAME AS FILE URL IN VBA CODE***" 
stream-url="chrome-extension://mhjfbmdgcfjbbpaeojofohoefgiehjai/761e8d06-3486-4bab-b043-df5b9a3c2510"     headers="accept-ranges: bytes
cache-control: max-age=1, must-revalidate
content-length: 375845
content-type: application/pdf
date: Wed, 06 May 2020 23:35:10 GMT
etag: 1588701484391
expires: Thu, 07 May 2020 00:35:10 GMT
last-modified: Tue, 05 May 2020 17:58:04 GMT
p3p: policyref=&quot;/w3c/p3p.xml&quot;, CP=&quot;NON DSP CURa ADMa DEVa TAIa OUR BUS IND UNI COM NAV INT&quot;
server: Microsoft-IIS/10.0
status: 200
x-content-type-options: nosniff
x-included-test: true
" background-color="0xFF525659" top-toolbar-height="56" javascript="allow" full-frame="">

Does it matter that the the pdf is a plugin rather than an attachment. Also the src is the site as what I have in the fileUrl in the below code.

Sub SaveFileFromURL()
Dim FileNum As Long
Dim FileData() As Byte
Dim WHTTP As Object

mainUrl = "https://www.website.com/j_security_check"
fileUrl = "https://www.website.com.com/controlFileRetrieve?ignorePresentViaObject=true&curDomId=111&posId=4574137"
filePath = "C:\myfile.pdf"

myuser = "xxxxxx"
mypass = "xxxxxx"

j_security_check = "j_username=" & myuser & "j_password=" & mypass

Set WHTTP = CreateObject("WinHTTP.WinHTTPrequest.5.1")


WHTTP.Open "POST", mainUrl, False 'WHTTP.Open "POST", fileUrl, False
WHTTP.setRequestHeader "Content-Type", "application/x-www-form-urlencoded"
WHTTP.send j_security_check


WHTTP.Open "GET", fileUrl, False
WHTTP.send

Debug.Print WHTTP.getAllResponseHeaders()

FileData = WHTTP.responseBody
Set WHTTP = Nothing

FileNum = FreeFile
Open filePath For Binary Access Write As #FileNum
Put #FileNum, 1, FileData
Close #FileNum

MsgBox "File has been saved!", vbInformation, "Success"

End Sub

Links that I have referenced or looked at:

VBA WinHTTP to download file from password proteced https website

How to make a POST request to a page that may redirect to a login page

Any help is appreciated!