Here is a macro that gets data from a server ( specifically mSupply server www.msupply.org.nz ) using Rest API. It could work with other servers that require authentication on URL header.

1. Getting Excel to use Rest API
Here is a way to retrieve data from a server that supports REST API.
Not sure how useful this will be, but I am sharing anyway.
On excel a button with macro is placed.
Clicking the button we get a window that shows the data.
Now if I had time, I could list data into excel cells, but I don’t.
Willing to e-mail the excel to anyone who wants it.
The Button method or the whole macro looks something like this.
The Base64Encode function does basic encoding of username and password.
Option Explicit
Sub Button1_Click()
Dim restReq, url, userName, password
Set restReq = CreateObject("Microsoft.XMLHTTP")
' Replace <node> with the address of your INSTEON device

2. ' Additionally, any REST command will work here
url = "http://192.168.3.235:8080/mobile/name?name=a@,customer=true&sortby=+name"
' If auth is required, replace the userName and password values
' with the ones you use on your ISY
userName = "Sam"
password = "Somepass"
restReq.Open "GET", url, False
restReq.setRequestHeader "Authorization", "Basic " + Base64Encode(userName + ":" + password)
restReq.send
'WScript.echo restReq.responseText
MsgBox (restReq.responseText)
End Sub
Function Base64Encode(sText)
Dim oXML, oNode
Set oXML = CreateObject("Msxml2.DOMDocument.3.0")
Set oNode = oXML.CreateElement("base64")
oNode.DataType = "bin.base64"
oNode.nodeTypedValue = Stream_StringToBinary(sText)
Base64Encode = oNode.Text
Set oNode = Nothing
Set oXML = Nothing
End Function
Function Base64Decode(ByVal vCode)
Dim oXML, oNode
Set oXML = CreateObject("Msxml2.DOMDocument.3.0")
Set oNode = oXML.CreateElement("base64")
oNode.DataType = "bin.base64"
oNode.Text = vCode
Base64Decode = Stream_BinaryToString(oNode.nodeTypedValue)
Set oNode = Nothing
Set oXML = Nothing
End Function
'Stream_StringToBinary Function
'2003 Antonin Foller, http://www.motobit.com
'Text - string parameter To convert To binary data
Function Stream_StringToBinary(Text)
Const adTypeText = 2
Const adTypeBinary = 1
'Create Stream object
Dim BinaryStream 'As New Stream
Set BinaryStream = CreateObject("ADODB.Stream")
'Specify stream type - we want To save text/string data.
BinaryStream.Type = adTypeText

3. 'Specify charset For the source text (unicode) data.
BinaryStream.Charset = "us-ascii"
'Open the stream And write text/string data To the object
BinaryStream.Open
BinaryStream.WriteText Text
'Change stream type To binary
BinaryStream.Position = 0
BinaryStream.Type = adTypeBinary
'Ignore first two bytes - sign of
BinaryStream.Position = 0
'Open the stream And get binary data from the object
Stream_StringToBinary = BinaryStream.Read
Set BinaryStream = Nothing
End Function
'Stream_BinaryToString Function
'2003 Antonin Foller, http://www.motobit.com
'Binary - VT_UI1 | VT_ARRAY data To convert To a string
Function Stream_BinaryToString(Binary)
Const adTypeText = 2
Const adTypeBinary = 1
'Create Stream object
Dim BinaryStream 'As New Stream
Set BinaryStream = CreateObject("ADODB.Stream")
'Specify stream type - we want To save binary data.
BinaryStream.Type = adTypeBinary
'Open the stream And write binary data To the object
BinaryStream.Open
BinaryStream.Write Binary
'Change stream type To text/string
BinaryStream.Position = 0
BinaryStream.Type = adTypeText
'Specify charset For the output text (unicode) data.
BinaryStream.Charset = "us-ascii"
'Open the stream And get text/string data from the object
Stream_BinaryToString = BinaryStream.ReadText
Set BinaryStream = Nothing
End Function