(VB.NET) Wish for Merchants -- Get OAuth2 Access Token for Desktop App

Demonstrates how to get a Wish for Merchants OAuth2 access token from a desktop application or script.

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

' This example is for desktop applicatons (it is not for code that runs on a web server).
' You'll need to add a line (or a few lines of code) to popup a web browser that navigates to a URL.
' This is explained in the comments below.

' This is the way to initially obtain the OAuth2 access token.  Afterwards it can be 
' repeatedly refreshed without user interaction, as shown in this example: Refresh Wish OAuth2 Access Token.

Dim oauth2 As New Chilkat.OAuth2
Dim success As Boolean

' Wish OAuth2 does not allow a localhost callback URI such as "http://localhost:<portNumber>/"
' For a desktop app, you must provide a script on your web server to redirect to "http://localhost/<portNumber>"
' It can be written in C#, PHP, or whatever desired.  It must include the query string in the redirection.
' For example, in PHP your script would look like this:

' <?php
'   header( 'Location: http://localhost:3017?' . $_SERVER['QUERY_STRING'] );
' ?>


oauth2.AppCallbackUrl = "https://yourwebserver.com/OAuth2.php"
oauth2.ListenPort = 3017

oauth2.AuthorizationEndpoint = "https://merchant.wish.com/v3/oauth/authorize"
oauth2.TokenEndpoint = "https://merchant.wish.com/api/v3/oauth/access_token"

oauth2.UncommonOptions = "EXCHANGE_CODE_FOR_TOKEN_USING_GET"

' Replace these with actual values.
oauth2.ClientId = "WISH-CLIENT-ID"
oauth2.ClientSecret = "WISH-CLIENT-SECRET"

oauth2.Scope = ""


' Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
Dim url As String = oauth2.StartAuth()
If (oauth2.LastMethodSuccess <> True) Then
    Debug.WriteLine(oauth2.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("url = " & url)

' At this point, your application should load the URL in a browser.
' For example, 
' in C#: System.Diagnostics.Process.Start(url);
' in Java: Desktop.getDesktop().browse(new URI(url));
' in VBScript: Set wsh=WScript.CreateObject("WScript.Shell")
'              wsh.Run url
' in Xojo: ShowURL(url)  (see http://docs.xojo.com/index.php/ShowURL)
' in Dataflex: Runprogram Background "c:\Program Files\Internet Explorer\iexplore.exe" sUrl        
' The Wish account owner would interactively accept or deny the authorization request.

' Add the code to load the url in a web browser here...
' Add the code to load the url in a web browser here...
' Add the code to load the url in a web browser here...



' Now wait for the authorization.
' We'll wait for a max of 60 seconds.
Dim numMsWaited As Integer = 0
While (numMsWaited < 60000) And (oauth2.AuthFlowState < 3)
    oauth2.SleepMs(100)
    numMsWaited = numMsWaited + 100
End While

' If there was no response from the browser within 60 seconds, then 
' the AuthFlowState will be equal to 1 or 2.
' 1: Waiting for Redirect. The OAuth2 background thread is waiting to receive the redirect HTTP request from the browser.
' 2: Waiting for Final Response. The OAuth2 background thread is waiting for the final access token response.
' In that case, cancel the background task started in the call to StartAuth.
If (oauth2.AuthFlowState < 3) Then
    oauth2.Cancel()
    Debug.WriteLine("No response from the browser!")
    Exit Sub
End If



' Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred
' The possible AuthFlowState values are:
' 3: Completed with Success. The OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
' 4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
' 5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
If (oauth2.AuthFlowState = 5) Then
    Debug.WriteLine("OAuth2 failed to complete.")
    Debug.WriteLine(oauth2.FailureInfo)
    Exit Sub
End If


If (oauth2.AuthFlowState = 4) Then
    Debug.WriteLine("OAuth2 authorization was denied.")
    Debug.WriteLine(oauth2.AccessTokenResponse)
    Exit Sub
End If


If (oauth2.AuthFlowState <> 3) Then
    Debug.WriteLine("Unexpected AuthFlowState:" & oauth2.AuthFlowState)
    Exit Sub
End If


' Save the full JSON access token response to a file.
Dim sbJson As New Chilkat.StringBuilder
sbJson.Append(oauth2.AccessTokenResponse)
sbJson.WriteFile("qa_data/tokens/wish.json","utf-8",False)

' The full JSON received looks like this:
' {
'   "message": "",
'   "code": 0,
'   "data": {
'     "access_token": "15af1c191c1243b029bc1660b5c08ce7",
'     "scopes": [
'       "epc:read",
'       "epc:write",
'       "fbs:read",
'       "fbs:write",
'       "fbw:read",
'       "fbw:write",
'       "infractions:read",
'       "infractions:write",
'       "insurance:read",
'       "insurance:write",
'       "loans:read",
'       "loans:write",
'       "merchant:read",
'       "merchant:write",
'       "notifications:read",
'       "notifications:write",
'       "orders:read",
'       "orders:write",
'       "payments:read",
'       "payments:write",
'       "penalties:read",
'       "penalties:write",
'       "product_boost:read",
'       "product_boost:write",
'       "products:read",
'       "products:write",
'       "ratings:read",
'       "ratings:write",
'       "returns:read",
'       "returns:write",
'       "tickets:read",
'       "tickets:write"
'     ],
'     "merchant_id": "5eb3f605178f5be2c784fa02",
'     "expiry_time": "2020-12-17T16:55:09.594+00:00",
'     "refresh_token": "55a38e44df674a1e859891624b2c4c23"
'   }
' }

Debug.WriteLine("OAuth2 authorization granted!")
Debug.WriteLine("Access Token = " & oauth2.AccessToken)