(VB.NET) RSAP Union API - Get OAuth2 Access Token

Demonstrates how to get an OAuth2 access token for the RSAP Union API. Note: This uses the client credentials flow, which does NOT require an interactive engagement using a browser.

For more information, see https://app.swaggerhub.com/apis-docs/pderas/RSAP/2.0.1#/Authentication/getOauthToken

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

' The following JSON is sent in the request body.

' {
'   "grant_type": "client_credentials",
'   "client_id": 1234,
'   "client_secret": "23456abcde"
' }


Dim json As New Chilkat.JsonObject
json.UpdateString("grant_type","client_credentials")
json.UpdateInt("client_id",1234)
json.UpdateString("client_secret","23456abcde")

http.SetRequestHeader("Content-type","application/json")

' Add the client certificate TLS authentication.
Dim cert As New Chilkat.Cert
success = cert.LoadFromFile("qa_data/certs_and_keys/union_client_certificate.crt")
If (success = False) Then
    Debug.WriteLine(cert.LastErrorText)
    Exit Sub
End If


Dim privKey As New Chilkat.PrivateKey
success = privKey.LoadAnyFormatFile("qa_data/certs_and_keys/union_client_certificate.nopass.key","")
If (success = False) Then
    Debug.WriteLine(privKey.LastErrorText)
    Exit Sub
End If


' Associate the private key with the cert.
' This will fail if the private key is not actually the correct one that corresponds to the public key stored within the cert.
success = cert.SetPrivateKey(privKey)
If (success = False) Then
    Debug.WriteLine(cert.LastErrorText)
    Exit Sub
End If


' Tell HTTP to use the cert for client TLS certificate authentication.
success = http.SetSslClientCert(cert)
If (success = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Dim resp As Chilkat.HttpResponse = http.PostJson3("https://api-test.rsap.ca/oauth/token","application/json",json)
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



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

' {
'   "token_type": "Bearer",
'   "expires_in": 3600,
'   "access_token": "eyJ0eXAi...LnE"
' }

' This token expires in 1 hour.  Your application could re-use the same token for up to an hour,
' or it can simply get a new access token before each request (if you're not doing too many requests).
success = jResp.WriteFile("qa_data/tokens/rsapToken.json")