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Salesforce OAuth2 Refresh Access Token

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Demonstrates how to refresh a Salesforce Access Token.

Note: Use Chilkat v10.1.2 or later for this example.

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Local $bSuccess = False

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

;  It is assumed we previously obtained an OAuth2 access token.
;  This example loads the JSON access token file 
;  saved by this example: Get SalesForce OAuth2 Access Token via Authorization Flow

$oJsonToken = ObjCreate("Chilkat.JsonObject")
$bSuccess = $oJsonToken.LoadFile("qa_data/tokens/_salesforce.json")
If ($bSuccess <> True) Then
    ConsoleWrite("Failed to load _salesforce.json" & @CRLF)
    Exit
EndIf

;  This is an example of a Salesforce OAuth2 access token to be refreshed:

;  {
;    "access_token": "00D41000....uLZBpT6",
;    "refresh_token": "5Aep....25xdGgkrV",
;    "signature": "cjTbSc5DvcKpaMoRTzuQTJLb1tcMw8LEO01flq4aMD4=",
;    "scope": "refresh_token id",
;    "instance_url": "https://d41000000f8a0eak-dev-ed.my.salesforce.com",
;    "id": "https://login.salesforce.com/id/00D41000000F8A0EAK/005410000....xAAE",
;    "token_type": "Bearer",
;    "issued_at": "1738348388166"
;  }

$oOauth2 = ObjCreate("Chilkat.OAuth2")

$oOauth2.TokenEndpoint = "https://login.salesforce.com/services/oauth2/token"

;  Replace this with your actual client ID (Consumer Key)
$oOauth2.ClientId = "CLIENT_ID"

;  Note: The client secret is not required because we configured our Connected App
;  to not require it for the refresh flow.  See the screenshot below.

;  Get the "refresh_token"
$oOauth2.RefreshToken = $oJsonToken.StringOf("refresh_token")

;  Send the HTTP POST to refresh the access token..
$bSuccess = $oOauth2.RefreshAccessToken()
If ($bSuccess <> True) Then
    ConsoleWrite($oOauth2.LastErrorText & @CRLF)
    Exit
EndIf

;  The response contains a new access token, but we must keep
;  our existing refresh token for when we need to refresh again in the future.
$oJsonToken.UpdateString("access_token",$oOauth2.AccessToken)

;  Save the new JSON access token response to a file.
$oSbJson = ObjCreate("Chilkat.StringBuilder")
$oJsonToken.EmitCompact = False
$oJsonToken.EmitSb($oSbJson)
$oSbJson.WriteFile("qa_data/tokens/_salesforce.json","utf-8",False)

ConsoleWrite("OAuth2 authorization granted!" & @CRLF)
ConsoleWrite("New Access Token = " & $oOauth2.AccessToken & @CRLF)

;  --------------------------------------------------------------------------
;  Here's a screenshot of a Salesforce Connected App 
;  which does not requires the secret for the authorization or refresh flow.
;