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Classic ASP Web API Examples

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(Classic ASP) QuickBooks - Automatically Refresh Access Token with No User Interaction

Demonstrates how to automaticaly refresh an expired access token and retry the request after a 401 authorization error.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

' Get our previously obtained OAuth2 access token, which should contain JSON like this:
' {
'   "expires_in": 3600,
'   "x_refresh_token_expires_in": 8726400,
'   "refresh_token": "L011546037639r ... 3vR2DrbOmg0Sdagw",
'   "access_token": "eyJlbmMiOiJBMTI4Q0 ... oETJEMbeggg",
'   "token_type": "bearer"
' }

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.JsonObject")
set jsonToken = Server.CreateObject("Chilkat.JsonObject")
success = jsonToken.LoadFile("qa_data/tokens/qb-access-token.json")

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Rest")
set rest = Server.CreateObject("Chilkat.Rest")

' Connect using TLS.
' A single REST object, once connected, can be used for many Quickbooks REST API calls.
' The auto-reconnect indicates that if the already-established HTTPS connection is closed,
' then it will be automatically re-established as needed.
bAutoReconnect = 1
success = rest.Connect("sandbox-quickbooks.api.intuit.com",443,1,bAutoReconnect)
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( rest.LastErrorText) & "</pre>"
    Response.End
End If

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder")
set sbAuth = Server.CreateObject("Chilkat.StringBuilder")
success = sbAuth.Append("Bearer ")
success = sbAuth.Append(jsonToken.StringOf("access_token"))
rest.Authorization = sbAuth.GetAsString()

success = rest.AddHeader("Accept","application/json")
rest.AllowHeaderFolding = 0

' The company ID is 123146096291789
' The employee ID is 58
responseBody = rest.FullRequestNoBody("GET","/v3/company/123146096291789/employee/58?minorversion=45")
If (rest.LastMethodSuccess <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( rest.LastErrorText) & "</pre>"
    Response.End
End If

' If we get a 401 authorization error, then it's likely because the access token expired.
' We can automatically refresh it without interaction from the user.
If (rest.ResponseStatusCode = 401) Then

    ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.OAuth2")
    set oauth2 = Server.CreateObject("Chilkat.OAuth2")

    oauth2.TokenEndpoint = "https://oauth.platform.intuit.com/oauth2/v1/tokens/bearer"

    ' Replace these with actual values.
    oauth2.ClientId = "QUICKBOOKS-CLIENT-ID"
    oauth2.ClientSecret = "QUICKBOOKS-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
        Response.Write "<pre>" & Server.HTMLEncode( oauth2.LastErrorText) & "</pre>"
        Response.End
    End If

    Response.Write "<pre>" & Server.HTMLEncode( "New access token: " & oauth2.AccessToken) & "</pre>"

    ' Update the JSON with the new tokens.
    success = 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.
    ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder")
    set sbJson = Server.CreateObject("Chilkat.StringBuilder")
    jsonToken.EmitCompact = 0
    success = jsonToken.EmitSb(sbJson)
    success = sbJson.WriteFile("qa_data/tokens/qb-access-token.json","utf-8",0)

    Response.Write "<pre>" & Server.HTMLEncode( "OAuth2 token refreshed!") & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( "New Access Token = " & oauth2.AccessToken) & "</pre>"

    sbAuth.Clear 
    success = sbAuth.Append("Bearer ")
    success = sbAuth.Append(oauth2.AccessToken)
    rest.Authorization = sbAuth.GetAsString()

    ' Now retry the request with the refreshed access token...
    responseBody = rest.FullRequestNoBody("GET","/v3/company/123146096291789/employee/58?minorversion=45")
    If (rest.LastMethodSuccess <> 1) Then
        Response.Write "<pre>" & Server.HTMLEncode( rest.LastErrorText) & "</pre>"
        Response.End
    End If

End If

' We should expect a 200 response if successful.
If (rest.ResponseStatusCode <> 200) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Request Header: ") & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( rest.LastRequestHeader) & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( "----") & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( "Response StatusCode = " & rest.ResponseStatusCode) & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( "Response StatusLine: " & rest.ResponseStatusText) & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( "Response Header:") & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( rest.ResponseHeader) & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( responseBody) & "</pre>"
    Response.End
End If

' Load the JSON response into a JSON object for parsing.
' A sample JSON response is shown below.
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.JsonObject")
set json = Server.CreateObject("Chilkat.JsonObject")
success = json.Load(responseBody)

' These will be used for parsing date/time strings..
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.CkDateTime")
set dtime = Server.CreateObject("Chilkat.CkDateTime")
bLocalTime = 1

' Show the JSON.   
json.EmitCompact = 0
Response.Write "<pre>" & Server.HTMLEncode( json.Emit()) & "</pre>"

' Get some information from the JSON..
Response.Write "<pre>" & Server.HTMLEncode( "Name: " & json.StringOf("Employee.DisplayName")) & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "Id: " & json.StringOf("Employee.Id")) & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "City: " & json.StringOf("Employee.PrimaryAddr.City")) & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "PostalCode: " & json.StringOf("Employee.PrimaryAddr.PostalCode")) & "</pre>"

' Load the CreateTime into a CkDateTime...
success = dtime.SetFromTimestamp(json.StringOf("Employee.MetaData.CreateTime"))
' dt is a Chilkat.DtObj
Set dt = dtime.GetDtObj(bLocalTime)
Response.Write "<pre>" & Server.HTMLEncode( dt.Month & "/" & dt.Day & "/" & dt.Year & "  " & dt.Hour _
     & ":" & dt.Minute) & "</pre>"

Response.Write "<pre>" & Server.HTMLEncode( "Success.") & "</pre>"

' Use this online tool to generate parsing code from sample JSON: 
' Generate Parsing Code from JSON

' ------------------------------------------------------
' The JSON response looks like this:

' {
'   "Employee": {
'     "SSN": "XXX-XX-XXXX",
'     "PrimaryAddr": {
'       "Id": "116",
'       "Line1": "45 N. Elm Street",
'       "City": "Middlefield",
'       "CountrySubDivisionCode": "CA",
'       "PostalCode": "93242"
'     },
'     "BillableTime": false,
'     "domain": "QBO",
'     "sparse": false,
'     "Id": "98",
'     "SyncToken": "0",
'     "MetaData": {
'       "CreateTime": "2015-07-24T09:34:35-07:00",
'       "LastUpdatedTime": "2015-07-24T09:34:35-07:00"
'     },
'     "GivenName": "Bill",
'     "FamilyName": "Miller",
'     "DisplayName": "Bill Miller",
'     "PrintOnCheckName": "Bill Miller",
'     "Active": true,
'     "PrimaryPhone": {
'       "FreeFormNumber": "234-525-1234"
'     }
'   },
'   "time": "2015-07-24T09:35:54.805-07:00"
' 

%>
</body>
</html>

 

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