(Visual Basic 6.0) Vonage UC Extend Refresh Access Token

Refreshes the access token for Vonage UC Extend apps.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

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

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

Dim jsonToken As New ChilkatJsonObject
Dim success As Long
success = jsonToken.LoadFile("qa_data/tokens/vonage_uc_extend.json")
If (success <> 1) Then
    Debug.Print "Failed to load hmrc.json"
    Exit Sub
End If

Dim oauth2 As New ChilkatOAuth2

oauth2.TokenEndpoint = "https://api.vonage.com/token"

' Replace these with actual values.
oauth2.ClientId = "CLIENT_ID"
oauth2.ClientSecret = "CLIENT_SECRET"

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

' Send the HTTP POST to refresh the access token..
success = oauth2.RefreshAccessToken()
If (success <> 1) Then
    Debug.Print oauth2.LastErrorText
    Exit Sub
End If

' Load the access token response into the json object 
success = jsonToken.Load(oauth2.AccessTokenResponse)

' If an "expires_on" member does not exist, then add the JSON member by
' getting the current system date/time and adding the "expires_in" seconds.
' This way we'll know when the token expires.
If (jsonToken.HasMember("expires_on") = 0) Then
    Dim dtExpire As New CkDateTime
    success = dtExpire.SetFromCurrentSystemTime()
    success = dtExpire.AddSeconds(jsonToken.IntOf("expires_in"))
    success = jsonToken.AppendString("expires_on",dtExpire.GetAsUnixTimeStr(0))
End If

' 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 ChilkatStringBuilder
jsonToken.EmitCompact = 0
success = jsonToken.EmitSb(sbJson)
success = sbJson.WriteFile("qa_data/tokens/vonage_uc_extend.json","utf-8",0)

Debug.Print "OAuth2 authorization granted!"
Debug.Print "New Access Token = " & oauth2.AccessToken