(VB.NET) Refresh Schwab OAuth2 Access Token

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Dim success As Boolean = False

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

' See Get Schwab OAuth2 Access Token 
' for sample code showing how to obtain a Schwab access token for desktop apps.

' This example assumes we previously obtained an OAuth2 access token for Schwab.

Dim jsonToken As New Chilkat.JsonObject
success = jsonToken.LoadFile("qa_data/tokens/schwab-access-token.json")
If (success <> True) Then
    Debug.WriteLine("Failed to load schwab-access-token.json")
    Exit Sub
End If


' The access token JSON looks something like this:

' {
'   "expires_in": 3600,
'   "x_refresh_token_expires_in": 8726400,
'   "refresh_token": "L011546037639r ... 3vR2DrbOmg0Sdagw",
'   "access_token": "eyJlbmMiOiJBMTI4Q0 ... oETJEMbeggg",
'   "token_type": "bearer"
' }

Dim oauth2 As New Chilkat.OAuth2

oauth2.TokenEndpoint = "https://api.schwabapi.com/v1/oauth/token"

' Replace these with actual values.
oauth2.ClientId = "APP_KEY"
oauth2.ClientSecret = "APP_SECRET"
oauth2.UseBasicAuth = True

' Get the "refresh_token"
oauth2.RefreshToken = jsonToken.StringOf("refresh_token")

' Send the HTTP POST to refresh the access token..
success = oauth2.RefreshAccessToken()
If (success = False) Then
    Debug.WriteLine(oauth2.LastErrorText)
    Exit Sub
End If


' The response contains a new access token, but we must keep
' our existing refresh token for when we need to refresh again in the future.
jsonToken.UpdateString("access_token",oauth2.AccessToken)

' Save the new JSON access token response to a file.
' The access + refresh tokens contained in this JSON will be needed for the next refresh.
Dim sbJson As New Chilkat.StringBuilder
jsonToken.EmitCompact = False

jsonToken.EmitSb(sbJson)
sbJson.WriteFile("qa_data/tokens/schwab-access-token.json","utf-8",False)

Debug.WriteLine("OAuth2 token refreshed!")
Debug.WriteLine("New Access Token = " & oauth2.AccessToken)