Did you try:

li_file = FileOpen("C:\test.pdf", StreamMode!, Write!, LockReadWrite!, Replace!)

FileWrite(li_file, ls_pdf)

FileClose(li_file)

Try using a Blob variable with the GetResponseBody call and write that to disk.

Hi Martin;

  Roland and John are correct but, you will need to decode the BASE64 data first back into its native (binary) format within the Blob variable before writing that PDF data to disk.

Regards ... Chris

Sorry for my late response.

Thaks to all of you for your help!

Now it works fine like this:

lnv_HttpClient.GetResponseBody(ls_ReturnJson)
... some code for filtering the pdf data

ls_filename = "test.pdf"
    
li_fh = FileOpen(ls_filename, StreamMode!,Write!,LockWrite!,Replace!)

if li_fh < 1 then
    messagebox("error","error creating " + ls_filename)
    return
end if

CoderObject lnv_CoderObject
lnv_CoderObject = Create CoderObject

lbl_blob = lnv_CoderObject.Base64Decode(ls_ReturnJson)

FileWrite(li_fh,lbl_blob)
FileClose( li_fh )

best regards

Martin