(VB.NET) citi Developer OAuth2 Client Credentials Grant

Get access token for your application credentials. You can use this for citi APIs which do not require customer credential verification and consent (e.g. Onboarding).

For more information, see https://sandbox.developerhub.citi.com/api/united-states/retail-bank/identity-security/authorize/documentation

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

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

Dim http As New Chilkat.Http
Dim success As Boolean

' Implements the following CURL command:

' curl --request POST \
'   --url https://sandbox.apihub.citi.com/gcb/api/clientCredentials/oauth2/token/us/gcb \
'   --header 'accept: application/json' \
'   --user client-id:client-secret \
'   --header 'content-type: application/x-www-form-urlencoded' \
'   --data 'grant_type=client_credentials&scope=%2Fapi'

http.Login = "client-id"
http.Password = "client-secret"

Dim req As New Chilkat.HttpRequest
req.HttpVerb = "POST"
req.Path = "/gcb/api/clientCredentials/oauth2/token/us/gcb"
req.ContentType = "application/x-www-form-urlencoded"
req.AddParam("grant_type","client_credentials")
req.AddParam("scope","/api")
req.AddHeader("accept","application/json")

Dim resp As Chilkat.HttpResponse = http.PostUrlEncoded("https://sandbox.apihub.citi.com/gcb/api/clientCredentials/oauth2/token/us/gcb",req)
If (http.LastMethodSuccess = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Dim sbResponseBody As New Chilkat.StringBuilder
resp.GetBodySb(sbResponseBody)
Dim jResp As New Chilkat.JsonObject
jResp.LoadSb(sbResponseBody)
jResp.EmitCompact = False

Debug.WriteLine("Response Body:")
Debug.WriteLine(jResp.Emit())

Dim respStatusCode As Integer = resp.StatusCode
Debug.WriteLine("Response Status Code = " & respStatusCode)
If (respStatusCode >= 400) Then
    Debug.WriteLine("Response Header:")
    Debug.WriteLine(resp.Header)
    Debug.WriteLine("Failed.")

    Exit Sub
End If



success = jResp.WriteFile("qa_data/tokens/citi_client_credentials.json")
If (success = False) Then
    Debug.WriteLine("Failed to save JSON access token file.")
    Exit Sub
End If



'  Sample JSON response:
'  (Sample code for parsing the JSON response is shown below)

'  {
'    "token_type": "bearer",
'    "access_token": "AAIkMjdh ... 3fsWb7zJ0s",
'    "expires_in": 1800,
'    "consented_on": 1584817860,
'    "scope": "/api"
'  }

'  Sample code for parsing the JSON response...
'  Use the following online tool to generate parsing code from sample JSON:
'  Generate Parsing Code from JSON

Dim token_type As String = jResp.StringOf("token_type")
Dim access_token As String = jResp.StringOf("access_token")
Dim expires_in As Integer = jResp.IntOf("expires_in")
Dim consented_on As Integer = jResp.IntOf("consented_on")
Dim scope As String = jResp.StringOf("scope")