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Visual Basic 6.0 Web API Examples

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(Visual Basic 6.0) ETrade OAuth1 Authorization (3-legged) Step 2

Demonstrates the final step in 3-legged OAuth1 authorization for the ETrade REST API. Example uses the OAuth1 verifier code that was copy-and-pasted from the browser in the 1st step. The end result of this final OAuth1 step is an access token that can be used to make ETrade REST API calls.

See https://apisb.etrade.com/docs/api/authorization/get_access_token.html

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

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

Dim consumerKey As String
consumerKey = "ETRADE_CONSUMER_KEY"
Dim consumerSecret As String
consumerSecret = "ETRADE_CONSUMER_SECRET"

Dim requestTokenUrl As String
requestTokenUrl = "https://apisb.etrade.com/oauth/request_token"
Dim authorizeUrl As String
authorizeUrl = "https://us.etrade.com/e/t/etws/authorize"
Dim accessTokenUrl As String
accessTokenUrl = "https://apisb.etrade.com/oauth/access_token"

Dim http As New ChilkatHttp
Dim success As Long
success = 1

http.OAuth1 = 1
http.OAuthConsumerKey = consumerKey
http.OAuthConsumerSecret = consumerSecret
http.OAuthCallback = "oob"

Dim jsonRequestToken As New ChilkatJsonObject
success = jsonRequestToken.LoadFile("qa_data/tokens/etrade_request_token.json")
Dim requestToken As String
requestToken = jsonRequestToken.StringOf("oauth_token")
Dim requestTokenSecret As String
requestTokenSecret = jsonRequestToken.StringOf("oauth_token_secret")

' ------------------------------------------------------------------------------
' Exchange the OAuth Request Token for an OAuth Access Token.

http.OAuthToken = requestToken
http.OAuthTokenSecret = requestTokenSecret

' This is the verifier that was interactively copy-and-pasted from the browser back to our app.
http.OAuthVerifier = "NJ07S"

Dim resp As ChilkatHttpResponse
Set resp = http.QuickGetObj(accessTokenUrl)
If (http.LastMethodSuccess <> 1) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

' Make sure a successful response was received.
If (resp.StatusCode <> 200) Then
    Debug.Print resp.StatusLine
    Debug.Print resp.Header
    Debug.Print resp.BodyStr
    Exit Sub
End If

' If successful, the resp.BodyStr contains something like this:
' oauth_token=85123455-fF41296Bi3daM8eCo9Y5vZabcdxXpRv864plYPOjr&oauth_token_secret=afiYJOgabcdSfGae7BDvJVVTwys8fUGpra5guZxbmFBZo
Debug.Print resp.BodyStr

Dim hashTab As New ChilkatHashtable
success = hashTab.AddQueryParams(resp.BodyStr)

Dim accessToken As String
accessToken = hashTab.LookupStr("oauth_token")
Dim accessTokenSecret As String
accessTokenSecret = hashTab.LookupStr("oauth_token_secret")

' The access token + secret is what should be saved and used for
' subsequent REST API calls.
Debug.Print "Access Token = " & accessToken
Debug.Print "Access Token Secret = " & accessTokenSecret

' Save this access token for future calls.
' Just in case we need user_id and screen_name, save those also..
Dim json As New ChilkatJsonObject
success = json.AppendString("oauth_token",accessToken)
success = json.AppendString("oauth_token_secret",accessTokenSecret)

Dim fac As New CkFileAccess
success = fac.WriteEntireTextFile("qa_data/tokens/etrade.json",json.Emit(),"utf-8",0)

Debug.Print "Success."

 

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