(PowerShell) Get eBay Application Token

This example shows how to request an eBay Application token.

Chilkat .NET Downloads Chilkat .NET Assemblies

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.

# See the Ebay documentation about Access token types
# Also see the Ebay documentation about client credentials grant flow

$http = New-Object Chilkat.Http

# If using the sandbox, the target endpoint will be:
# POST https://api.sandbox.ebay.com/identity/v1/oauth2/token

# If using the production (live) system, the target endpoint will be:
# POST https://api.ebay.com/identity/v1/oauth2/token

# The eBay client_id and client_secret needs to be sent
# in a Basic Authorization  request header, which has this format:
# Authorization: Basic <B64_encoded_oauth_credentials>

# Chilkat takes care of it.  You only need to set the Login = client_id,
# and password = client_secret, and indicate you want "Basic" HTTP Authorization.
$http.Login = "EBAY_CLIENT_ID"
$http.Password = "EBAY_CLIENT_SECRET"
$http.BasicAuth = $true

# Let's do the following POST:

#   HTTP method:   POST
#   URL (Sandbox): https://api.sandbox.ebay.com/identity/v1/oauth2/token
# 
#   HTTP headers:
#     Content-Type = application/x-www-form-urlencoded
#     Authorization = Basic <B64-encoded-oauth-credentials>
# 
#   Request body (wrapped for readability):
#     grant_type=client_credentials&
#     redirect_uri=<RuName-value>&
#     scope=<SPACE separated list of scopes>
# 

# Create an HttpRequest object to hold the request params.
$req = New-Object Chilkat.HttpRequest
$req.HttpVerb = "POST"
$req.AddParam("grant_type","client_credentials")

# The scope query param indicates the access to be provided by the token.
# Multiple scopes can be specified by separating each with a SPACE char.
# See the Ebay OAuth scopes documentation

$req.AddParam("scope","https://api.ebay.com/oauth/api_scope")

# (The PostUrlEncoded method automatically sets the Content-Type header equal to "application/x-www-form-urlencoded")
$endPoint = "https://api.sandbox.ebay.com/identity/v1/oauth2/token"
$resp = $http.PostUrlEncoded($endPoint,$req)
if ($http.LastMethodSuccess -ne $true) {
    $($http.LastErrorText)
    exit
}

# The response is JSON..
$json = New-Object Chilkat.JsonObject
$json.Load($resp.BodyStr)
$json.EmitCompact = $false

# If the response status code is not 200, then it failed.
$("Response status code = " + $resp.StatusCode)
if ($resp.StatusCode -ne 200) {
    $($json.Emit())
    $("Failed.")
    exit
}

# We successfully retrieved an eBay access token.
# The actual access token string can be parsed from the JSON like this:
$accessToken = $json.StringOf("access_token")

# This application token is only valid for 7200 seconds (2 hours).  We'll want to refresh
# it before it expires.  (There is an online example for that..)
# For now, let's save the JSON to a file for our application to use.

# But before doing that, let's add to the JSON an expiration timestamp
# so we know when to refresh the token.
$dtExpire = New-Object Chilkat.CkDateTime
$dtExpire.SetFromCurrentSystemTime()
$dtExpire.AddSeconds($json.IntOf("expires_in"))
$json.AppendString("expire_time",$dtExpire.GetAsTimestamp($false))

# Persist the JSON to a file.
$fac = New-Object Chilkat.FileAccess
$success = $fac.WriteEntireTextFile("qa_data/tokens/ebay.json",$json.Emit(),"utf-8",$false)
if ($success -ne $true) {
    $($fac.LastErrorText)
    $("Failed to save eBay Application token to file.")
    exit
}

$($json.Emit())
$("Success.")

# The output of this example is:

# 	{ 
# 	  "access_token": "v^1.1#i^1#p^1#I^3#r^0# ... Ajp1BQhJDgAA",
# 	  "token_type": "Application Access Token",
# 	  "expires_in": 7200,
# 	  "refresh_token": "N/A",
# 	  "expire_time": "2017-04-16T14:44:20Z"
# 	}
# 
# 	Success.
#