(Xojo Plugin) Get eBay Application Token

This example shows how to request an eBay Application token.

Chilkat Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

// 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

Dim http As New 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.
Dim req As New 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")
Dim endPoint As String
endPoint = "https://api.sandbox.ebay.com/identity/v1/oauth2/token"
Dim resp As Chilkat.HttpResponse
resp = http.PostUrlEncoded(endPoint,req)
If (http.LastMethodSuccess <> True) Then
    System.DebugLog(http.LastErrorText)
    Return
End If

// The response is JSON..
Dim json As New Chilkat.JsonObject
success = json.Load(resp.BodyStr)
json.EmitCompact = False

// If the response status code is not 200, then it failed.
System.DebugLog("Response status code = " + Str(resp.StatusCode))
If (resp.StatusCode <> 200) Then
    System.DebugLog(json.Emit())
    System.DebugLog("Failed.")
    Return
End If

// We successfully retrieved an eBay access token.
// The actual access token string can be parsed from the JSON like this:
Dim accessToken As String
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.
Dim dtExpire As New Chilkat.CkDateTime
success = dtExpire.SetFromCurrentSystemTime()
success = dtExpire.AddSeconds(json.IntOf("expires_in"))
success = json.AppendString("expire_time",dtExpire.GetAsTimestamp(False))

// Persist the JSON to a file.
Dim fac As New Chilkat.FileAccess
Dim success As Boolean
success = fac.WriteEntireTextFile("qa_data/tokens/ebay.json",json.Emit(),"utf-8",False)
If (success <> True) Then
    System.DebugLog(fac.LastErrorText)
    System.DebugLog("Failed to save eBay Application token to file.")
    Return
End If

System.DebugLog(json.Emit())
System.DebugLog("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.
//