Using Paypal REST with Classic ASP

Question

I am trying to make a simple call to the Paypal API with the following code:

On error resume next

Set objHTTP = CreateObject("Microsoft.XMLHTTP")
objHTTP.open "POST", "https://api.sandbox.paypal.com/v1/oauth2/token", False

objHTTP.setRequestHeader "Accept", "application/json"
objHTTP.setRequestHeader "Accept-Language", "en_US"
objHTTP.setRequestHeader "Authorization", "Basic " & Base64Encode("client-id:secret")
objHTTP.send "grant_type=client_credentials"

Response.Write err.description & " | " & err.number

But it’s returning the error:

The download of the specified resource has failed

With Postman it works smoothly. Would anyone know where the bug is? I’m using it on localhost without SSL (I don’t know if it affects).