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  1. POFacebook Pay Dialog not returning resposnse
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    <p>I'm trying to open a Pay Dialog and it's not going well. When I set the action to buy_credits or ear_credits it works. But when I set action to buy_item it returns an error of"</p> <pre><code>1383046 - Sorry, but we're having trouble processing your payment. You have not been charged for this transaction. Please try again. </code></pre> <p>My Java Code:</p> <pre><code>&lt;script type="text/javascript"&gt; function buy() { FB.ui( { method: 'pay', action: 'buy_item', order_info: { 'item_id': '1a'}, dev_purchase_params: {'oscif': true} }, js_callback); } var js_callback = function (data) { if (data['order_id']) { write_callback_data( "&lt;br&gt;&lt;b&gt;Transaction Completed!&lt;/b&gt; &lt;/br&gt;&lt;/br&gt;" + "Data returned from Facebook: &lt;/br&gt;" + "Order ID: " + data['order_id'] + "&lt;/br&gt;" + "Status: " + data['status']); } else if (data['error_code']) { // Appropriately alert the user. write_callback_data( "&lt;br&gt;&lt;b&gt;Transaction Failed!&lt;/b&gt; &lt;/br&gt;&lt;/br&gt;" + "Error message returned from Facebook:&lt;/br&gt;" + data['error_code'] + " - " + data['error_message']); } else { // Appropriately alert the user. write_callback_data("&lt;br&gt;&lt;b&gt;Transaction failed!&lt;/b&gt;"); } }; function write_callback_data(str) { document.getElementById('fb-ui-return-data').innerHTML = str; } &lt;/script&gt; </code></pre> <p>My PHP callback code:</p> <pre><code>error_reporting(E_ALL); $app_secret = '********************************'; // Validate request is from Facebook and parse contents for use. $request = parse_signed_request($_POST['signed_request'], $app_secret); // Get request type. // Two types: // 1. payments_get_items. // 2. payments_status_update. $request_type = $_POST['method']; error_log($request_type, 0); // Setup response. $response = ''; if ($request_type == 'payments_get_items') { // Get order info from Pay Dialog's order_info. // Assumes order_info is a JSON encoded string. $order_info = json_decode($request['credits']['order_info'], true); // Get item id. $item_id = $order_info['item_id']; // Simulutates item lookup based on Pay Dialog's order_info. if ($item_id == '1a') { $item = array( 'title' =&gt; '100 Gold', 'description' =&gt; 'Premium Currency.', // Price must be denominated in credits. 'price' =&gt; 5, 'image_url' =&gt; '1a.png' ); // Construct response. $response = array( 'content' =&gt; array( 0 =&gt; $item, ), 'method' =&gt; "payments_get_items", ); // Response must be JSON encoded. $response = json_encode($response); } } else if ($request_type == "payments_status_update") { // Get order details. $order_details = json_decode($request['credits']['order_details'], true); // Determine if this is an earned currency order. $item_data = json_decode($order_details['items'][0]['data'], true); $earned_currency_order = (isset($item_data['modified'])) ? $item_data['modified'] : null; // Get order status. $current_order_status = $order_details['status']; if ($current_order_status == 'placed') { // Fulfill order based on $order_details unless... if ($earned_currency_order) { // Fulfill order based on the information below... // URL to the application's currency webpage. $product = $earned_currency_order['product']; // Title of the application currency webpage. $product_title = $earned_currency_order['product_title']; // Amount of application currency to deposit. $product_amount = $earned_currency_order['product_amount']; // If the order is settled, the developer will receive this // amount of credits as payment. $credits_amount = $earned_currency_order['credits_amount']; } $next_order_status = 'settled'; // Construct response. $response = array( 'content' =&gt; array( 'status' =&gt; $next_order_status, 'order_id' =&gt; $order_details['order_id'], ), 'method' =&gt; $request_type, ); // Response must be JSON encoded. $response = json_encode($response); } else if ($current_order_status == 'disputed') { // 1. Track disputed item orders. // 2. Investigate user's dispute and resolve by settling or refunding the order. // 3. Update the order status asychronously using Graph API. } else if ($current_order_status == 'refunded') { // Track refunded item orders initiated by Facebook. No need to respond. } else { // Track other order statuses. } } // Send response. error_log(print_r($response, true)); echo $response; // These methods are documented here: // https://developers.facebook.com/docs/authentication/signed_request/ function parse_signed_request($signed_request, $secret) { list($encoded_sig, $payload) = explode('.', $signed_request, 2); // decode the data $sig = base64_url_decode($encoded_sig); $data = json_decode(base64_url_decode($payload), true); if (strtoupper($data['algorithm']) !== 'HMAC-SHA256') { error_log('Unknown algorithm. Expected HMAC-SHA256'); return null; } // check sig $expected_sig = hash_hmac('sha256', $payload, $secret, $raw = true); if ($sig !== $expected_sig) { error_log('Bad Signed JSON signature!'); return null; } return $data; } function base64_url_decode($input) { return base64_decode(strtr($input, '-_', '+/')); } </code></pre> <p>I have error_log calls in the script and it seems when I press the buy button it calls the service twice. Calling the same method: payments_get_items. The response data looks like it is properly formatted. Here is the output of the log:</p> <pre><code>payments_get_items {"content":[{"title":"100 Gold","description":"Premium Currency.","price":5,"image_url":"1a.png"}],"method":"payments_get_items"} payments_get_items {"content":[{"title":"100 Gold","description":"Premium Currency.","price":5,"image_url":"1a.png"}],"method":"payments_get_items"} </code></pre>
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