(VB.NET) Check PayPal Access Token Expiration

Checks to see if the PayPal access token expired.

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

' Note: Requires Chilkat v9.5.0.64 or greater.

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

' In the example linked here: PayPal OAuth2 Token,
' we fetched a PayPal access token and saved it to a JSON file.
' We also recorded the current date/time.
' Load this JSON file and compare the current date/time with the fetch date/time
' and the "expires_in" value to see if the token is expired.

Dim json As New Chilkat.JsonObject
Dim success As Boolean = json.LoadFile("qa_data/tokens/paypal.json")
If (success <> True) Then
    Debug.WriteLine("Failed to load access key json file.")
    Exit Sub
End If


' Get the current date/time.
Dim dateTime As New Chilkat.CkDateTime
Dim bLocalTime As Boolean = False
Dim dtNow As Integer = dateTime.GetAsUnixTime(bLocalTime)

' Get the access token create date/time
Dim dtCreate As Integer = json.IntOf("tokenCreateTimeUtc")

' Find out how many seconds have elapsed.
Dim numSeconds As Integer = dtNow - dtCreate

' Get the expires_in value from the JSON.
Dim expires_in As Integer = json.IntOf("expires_in")

Debug.WriteLine("token age (in seconds) = " & numSeconds)
Debug.WriteLine("expires_in = " & expires_in)

' If the token expired, or if it will expire in 5 minutes or less,
' get another token.
If (numSeconds < (expires_in - 300)) Then
    Debug.WriteLine("The token is not yet expired.  No need to fetch another.")
    Exit Sub
End If


Debug.WriteLine("Time to fetch a new access token...")

' Get another token..
' See the example at Get PayPal OAuth2 Token
' to get another token..