B4X

citi Developer OAuth2 Client Credentials Grant

See more OAuth2 Examples

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). B4X

Dim success As Boolean = False

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

Dim http As ChilkatHttp
http.Initialize("http")

'  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 ChilkatHttpRequest
req.Initialize
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
resp.Initialize
success = http.HttpReq("https://sandbox.apihub.citi.com/gcb/api/clientCredentials/oauth2/token/us/gcb", req, resp)
If success = False Then
    Log(http.LastErrorText)
    Return
End If


Dim sbResponseBody As ChilkatStringBuilder
sbResponseBody.Initialize
resp.GetBodySb(sbResponseBody)
Dim jResp As ChilkatJsonObject
jResp.Initialize
jResp.LoadSb(sbResponseBody)
jResp.EmitCompact = False

Log("Response Body:")
Log(jResp.Emit)

Dim respStatusCode As Int = resp.StatusCode
Log("Response Status Code = " & respStatusCode)
If respStatusCode >= 400 Then
    Log("Response Header:")
    Log(resp.Header)
    Log("Failed.")
    Return
End If


success = jResp.WriteFile("qa_data/tokens/citi_client_credentials.json")
If success = False Then
    Log("Failed to save JSON access token file.")
    Return
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 Int = jResp.IntOf("expires_in")
Dim consented_on As Int = jResp.IntOf("consented_on")
Dim scope As String = jResp.StringOf("scope")