(Visual Basic 6.0) 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 ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

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

Dim http As New ChilkatHttp
Dim success As Long

' 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 ChilkatHttpRequest
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 ChilkatHttpResponse
Set resp = http.PostUrlEncoded("https://sandbox.apihub.citi.com/gcb/api/clientCredentials/oauth2/token/us/gcb",req)
If (http.LastMethodSuccess = 0) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

Dim sbResponseBody As New ChilkatStringBuilder
success = resp.GetBodySb(sbResponseBody)
Dim jResp As New ChilkatJsonObject
success = jResp.LoadSb(sbResponseBody)
jResp.EmitCompact = 0

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

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

    Exit Sub
End If

success = jResp.WriteFile("qa_data/tokens/citi_client_credentials.json")
If (success = 0) Then
    Debug.Print "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
token_type = jResp.StringOf("token_type")
Dim access_token As String
access_token = jResp.StringOf("access_token")
Dim expires_in As Long
expires_in = jResp.IntOf("expires_in")
Dim consented_on As Long
consented_on = jResp.IntOf("consented_on")
Dim scope As String
scope = jResp.StringOf("scope")