(Xojo Plugin) Refresh Schwab OAuth2 Access Token

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Dim success As Boolean
success = 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
    System.DebugLog("Failed to load schwab-access-token.json")
    Return
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
    System.DebugLog(oauth2.LastErrorText)
    Return
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.
success = 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

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

System.DebugLog("OAuth2 token refreshed!")
System.DebugLog("New Access Token = " + oauth2.AccessToken)