(PowerShell) Refresh eBay Application Access Token

This example shows how to get a new eBay REST API access token when the original is close to expiration.

Note: This example requires Chilkat v9.5.0.80 or greater. (This example was written on 21-August-2019, before v9.5.0.80 was released. If Contact Chilkat for a pre-release if the current Chilkat version is not yet at 9.5.0.80 or greater.)

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

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

# The previously fetched eBay access token looks like this:

# {
#   "access_token": "v^1.1#i^1# ... HwSAAA=",
#   "expires_in": 7200,
#   "refresh_token": "v^1.1#i^1# ... FXjEyODQ=",
#   "refresh_token_expires_in": 47304000,
#   "token_type": "User Access Token"
# }

$json = New-Object Chilkat.JsonObject
$success = $json.LoadFile("qa_data/tokens/ebay-access-token.json")
if ($success -eq $false) {
    $("Failed to load the existing ebay access token JSON.")
    exit
}

$oauth2 = New-Object Chilkat.OAuth2

$oauth2.TokenEndpoint = "https://api.sandbox.ebay.com/identity/v1/oauth2/token"

# Replace these with actual values.
$oauth2.ClientId = "EBAY_CLIENT_ID"
$oauth2.ClientSecret = "EBAY_CLIENT_SECRET"

# Get the "refresh_token"
$oauth2.RefreshToken = $json.StringOf("refresh_token")

# Send the HTTP POST to refresh the access token..
$success = $oauth2.RefreshAccessToken()
if ($success -ne $true) {
    $($oauth2.LastErrorText)
    exit
}

# Load the access token response into the JSON object 
$json.Load($oauth2.AccessTokenResponse)

# Save the new JSON access token response to a file.
# The access + refresh tokens contained in this JSON will be needed for the next refresh.
$json.EmitCompact = $false
$json.WriteFile("qa_data/tokens/ebay-access-token.json")

$("OAuth2 authorization granted!")
$("New Access Token = " + $oauth2.AccessToken)