(.NET Core C#) Amazon SP-API Request an LWA access token

See more Amazon SP-API Examples

Request an LWA access token, make a secure HTTP POST to the LWA authentication server (https://api.amazon.com/auth/o2/token)

For more information, see https://developer-docs.amazon.com/sp-api/docs/connecting-to-the-selling-partner-api

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

Chilkat.Http http = new Chilkat.Http();

// Implements the following CURL command:

// curl -X POST https://example.com/auth/o2/token \
//   -H "Host: api.amazon.com" \
//   -H "Content-Type: application/x-www-form-urlencoded;charset=UTF-8" \
//   -d "grant_type=refresh_token" \
//   -d "refresh_token=Aztr|..." \
//   -d "client_id=foodev" \
//   -d "client_secret=Y76SDl2F"

// Use the following online tool to generate HTTP code from a CURL command
// Convert a cURL Command to HTTP Source Code

Chilkat.HttpRequest req = new Chilkat.HttpRequest();
req.AddParam("grant_type","refresh_token");
req.AddParam("refresh_token","Aztr|...");
req.AddParam("client_id","foodev");
req.AddParam("client_secret","Y76SDl2F");

req.AddHeader("Host","api.amazon.com");

Chilkat.HttpResponse resp = http.PostUrlEncoded("https://api.amazon.com/auth/o2/token",req);
if (http.LastMethodSuccess == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

int statusCode = resp.StatusCode;
Debug.WriteLine("Status Code = " + Convert.ToString(statusCode));

Chilkat.JsonObject json = new Chilkat.JsonObject();
json.Load(resp.BodyStr);

json.EmitCompact = false;
Debug.WriteLine(json.Emit());

if (statusCode != 200) {
    Debug.WriteLine("Failed.");
    return;
}

// Success returns this JSON:

// {
//   "access_token": "Atza|...",
//   "refresh_token": "Atzr|...",
//   "token_type": "bearer",
//   "expires_in": 3600
// }

// Save the JSON token to a file for use in subsequent calls.
// (this example is passing a relative file path.  You don't need to save to a file
// if, for example, you keep the access token in-memory for subsequent use...)
bool success = json.WriteFile("qa_data/tokens/sp_api_lwa_token.json");

Debug.WriteLine("access_token: " + json.StringOf("access_token"));
Debug.WriteLine("Success.");