(VB.NET) Amazon SP-API Request an LWA access token

See more Amazon SP-API Examples

Request an LWA access token, make a secure HTTP POST to the LWA authentication server (https://api.amazon.com/auth/o2/token)

For more information, see https://developer-docs.amazon.com/sp-api/docs/connecting-to-the-selling-partner-api

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim http As New Chilkat.Http

' Implements the following CURL command:

' curl -X POST https://example.com/auth/o2/token \
'   -H "Host: api.amazon.com" \
'   -H "Content-Type: application/x-www-form-urlencoded;charset=UTF-8" \
'   -d "grant_type=refresh_token" \
'   -d "refresh_token=Aztr|..." \
'   -d "client_id=foodev" \
'   -d "client_secret=Y76SDl2F"

' Use the following online tool to generate HTTP code from a CURL command
' Convert a cURL Command to HTTP Source Code

Dim req As New Chilkat.HttpRequest
req.AddParam("grant_type","refresh_token")
req.AddParam("refresh_token","Aztr|...")
req.AddParam("client_id","foodev")
req.AddParam("client_secret","Y76SDl2F")

req.AddHeader("Host","api.amazon.com")

Dim resp As Chilkat.HttpResponse = http.PostUrlEncoded("https://api.amazon.com/auth/o2/token",req)
If (http.LastMethodSuccess = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Dim statusCode As Integer = resp.StatusCode
Debug.WriteLine("Status Code = " & statusCode)

Dim json As New Chilkat.JsonObject
json.Load(resp.BodyStr)


json.EmitCompact = False
Debug.WriteLine(json.Emit())

If (statusCode <> 200) Then
    Debug.WriteLine("Failed.")
    Exit Sub
End If


' Success returns this JSON:

' {
'   "access_token": "Atza|...",
'   "refresh_token": "Atzr|...",
'   "token_type": "bearer",
'   "expires_in": 3600
' }


' Save the JSON token to a file for use in subsequent calls.
' (this example is passing a relative file path.  You don't need to save to a file
' if, for example, you keep the access token in-memory for subsequent use...)
Dim success As Boolean = json.WriteFile("qa_data/tokens/sp_api_lwa_token.json")

Debug.WriteLine("access_token: " & json.StringOf("access_token"))
Debug.WriteLine("Success.")