(Visual Basic 6.0) 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 ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

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

Dim http As New ChilkatHttp

' 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 ChilkatHttpRequest
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 ChilkatHttpResponse
Set resp = http.PostUrlEncoded("https://api.amazon.com/auth/o2/token",req)
If (http.LastMethodSuccess = 0) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

Dim statusCode As Long
statusCode = resp.StatusCode
Debug.Print "Status Code = " & statusCode

Dim json As New ChilkatJsonObject
success = json.Load(resp.BodyStr)

json.EmitCompact = 0
Debug.Print json.Emit()

If (statusCode <> 200) Then
    Debug.Print "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 Long
success = json.WriteFile("qa_data/tokens/sp_api_lwa_token.json")

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