(Go) Refresh Schwab OAuth2 Access Token

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    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_Ref.html">OAuth2 access token for Schwab.

    jsonToken := JsonObject_Ref.html">chilkat.NewJsonObject()
    success = jsonToken.LoadFile("qa_data/tokens/schwab-access-token.json")
    if success != true {
        fmt.Println("Failed to load schwab-access-token.json")
        jsonToken.DisposeJsonObject()
        return
    }

    // 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"
    // }

    oauth2 := OAuth2_Ref.html">chilkat.NewOAuth2()

    oauth2.SetTokenEndpoint("https://api.schwabapi.com/v1/oauth/token")

    // Replace these with actual values.
    oauth2.SetClientId("APP_KEY")
    oauth2.SetClientSecret("APP_SECRET")
    oauth2.SetUseBasicAuth(true)

    // Get the "refresh_token"
    oauth2.SetRefreshToken(jsonToken.StringOf("refresh_token"))

    // Send the HTTP POST to refresh the access token..
    success = oauth2.RefreshAccessToken()
    if success == false {
        fmt.Println(oauth2.LastErrorText())
        jsonToken.DisposeJsonObject()
        oauth2.DisposeOAuth2()
        return
    }

    // 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.
    sbJson := StringBuilder_Ref.html">chilkat.NewStringBuilder()
    jsonToken.SetEmitCompact(false)

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

    fmt.Println("OAuth2_Ref.html">OAuth2 token refreshed!")
    fmt.Println("New Access Token = ", oauth2.AccessToken())

    jsonToken.DisposeJsonObject()
    oauth2.DisposeOAuth2()
    sbJson.DisposeStringBuilder()