(Mono C#) Get eBay Application Token

This example shows how to request an eBay Application token.

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// 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

Chilkat.Http http = 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.
Chilkat.HttpRequest req = 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")
string endPoint = "https://api.sandbox.ebay.com/identity/v1/oauth2/token";
Chilkat.HttpResponse resp = http.PostUrlEncoded(endPoint,req);
if (http.LastMethodSuccess != true) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

// The response is JSON..
Chilkat.JsonObject json = new Chilkat.JsonObject();
json.Load(resp.BodyStr);
json.EmitCompact = false;

// If the response status code is not 200, then it failed.
Debug.WriteLine("Response status code = " + Convert.ToString(resp.StatusCode));
if (resp.StatusCode != 200) {
    Debug.WriteLine(json.Emit());
    Debug.WriteLine("Failed.");
    return;
}

// We successfully retrieved an eBay access token.
// The actual access token string can be parsed from the JSON like this:
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.
Chilkat.CkDateTime dtExpire = new Chilkat.CkDateTime();
dtExpire.SetFromCurrentSystemTime();
dtExpire.AddSeconds(json.IntOf("expires_in"));
json.AppendString("expire_time",dtExpire.GetAsTimestamp(false));

// Persist the JSON to a file.
Chilkat.FileAccess fac = new Chilkat.FileAccess();
bool success = fac.WriteEntireTextFile("qa_data/tokens/ebay.json",json.Emit(),"utf-8",false);
if (success != true) {
    Debug.WriteLine(fac.LastErrorText);
    Debug.WriteLine("Failed to save eBay Application token to file.");
    return;
}

Debug.WriteLine(json.Emit());
Debug.WriteLine("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.
//