eBay OAuth cannot fetch token - oauth

Question

I am trying to integrate an eBay SDK developed by David Sadler which is in GitHub. But I got stuck on connection part itself. I am getting app token with http://localhost/ebay-sdk-examples/oauth-tokens/01-get-app-token.php with my production credentials.
But when I hit, http://localhost/ebay-sdk-examples/oauth-tokens/02-get-user-token.php it gives me this error:
[error] => invalid_grant
[error_description] => the provided authorization grant code is invalid or was issued to another client
all The codes are available in the SDK link. Incase you need here is the code snippet
<?php
/**
* Copyright 2017 David T. Sadler
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Include the SDK by using the autoloader from Composer.
*/
require __DIR__ . '/../vendor/autoload.php';
/**
* Include the configuration values.
*
* Ensure that you have edited the configuration.php file
* to include your application keys.
*/
$config = require __DIR__ . '/../configuration.php';
/**
* The namespaces provided by the SDK.
*/
use \DTS\eBaySDK\OAuth\Services;
use \DTS\eBaySDK\OAuth\Types;
/**
* Create the service object.
*/
$service = new Services\OAuthService([
'credentials' => $config['production']['credentials'],
'ruName' => $config['production']['ruName'],
'sandbox' => false,
]);
$token = $config['production']['testToken']; ** This is the app token I get with http://localhost/ebay-sdk-examples/oauth-tokens/01-get-app-token.php **
/**
* Create the request object.
*/
$request = new Types\GetUserTokenRestRequest();
$request->code = $token;
// $request->code = 'v^1.1#i^1#I^3#r^1#p^3#f^0#t^Ul41XzA6MkIzRjJFRjA1MENDMzZCQjlGMjVERkYyMkMxMTRBM0VfMV8xI0VeMjYw';
/**
* Send the request.
*/
$response = $service->getUserToken($request);
echo '<pre>';
print_r($response);
echo '<pre>';
exit;
/**
* Output the result of calling the service operation.
*/
printf("\nStatus Code: %s\n\n", $response->getStatusCode());
if ($response->getStatusCode() !== 200) {
printf(
"%s: %s\n\n",
$response->error,
$response->error_description
);
} else {
printf(
"%s\n%s\n%s\n%s\n\n",
$response->access_token,
$response->token_type,
$response->expires_in,
$response->refresh_token
);
}
If there are simple codes to without using any SDK to connect to eBay with OAuth, its what I am searching for.

Answer 1

I am also currently working with this SDK.
My understanding is you should place the url:
http://localhost/ebay-sdk-examples/oauth-tokens/02-get-user-token.php
As your Your auth accepted URL1 in the developer.ebay.com, under Get a Token from eBay via Your Application.
Where you are setting $token this should be set to $_GET['code'] as when testing the sign-in and accepting you should be redirected to the above URL with a ?code=xxxx parsed back to it.
The value your currently setting to $token should be set as the value of your authToken within your credentials.
Hope that helps.

Answer 2

eBay Token generation can be achieved using our custom PHP/.NET scripts. eBay API documentation having many references
https://viewdotnet.wordpress.com/2011/12/20/ebay-token-generation/
The above link includes all the required details to generate eBay Auth. token