B4X

Refresh Schwab OAuth2 Access Token

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Demonstrates how to refresh a Schwab OAuth2 access token. B4X

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 ChilkatJsonObject
jsonToken.Initialize
success = jsonToken.LoadFile("qa_data/tokens/schwab-access-token.json")
If success <> True Then
    Log("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 ChilkatOAuth2
oauth2.Initialize("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
    Log(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.
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 ChilkatStringBuilder
sbJson.Initialize
jsonToken.EmitCompact = False

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

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