There is a form, how to process the payment on your site after payment?

<form action="https://www.sandbox.paypal.com/cgi-bin/websc" method="post"> <input type="hidden" name="cmd" value="_xclick"> <input type="hidden" name="business" value="mr.dealer-facilitator@mail.ru"> <input id="paypalItemName" type="hidden" name="item_name" value="5"> <input id="paypalQuantity" type="hidden" name="quantity" value="1"> <input id="paypalAmmount" type="hidden" name="amount" value="0.01"> <input type="hidden" name="return" value="https://jobinchina.co/ipn"> <input type="hidden" name="custom" value="<?php echo json_encode($customData = ['user_id' => 1, 'product_id' => 1]);?>"> <input type="hidden" name="currency_code" value="USD"> <input type="hidden" name="lc" value="US"> <input type="hidden" name="bn" value="PP-BuyNowBF"> <button type="submit"> Pay Now</button> </form>

on the success page returns false

 $raw_post_data = file_get_contents('php://input'); $raw_post_array = explode('&', $raw_post_data); $myPost = array(); foreach ($raw_post_array as $keyval) { $keyval = explode ('=', $keyval); if (count($keyval) == 2) $myPost[$keyval[0]] = urldecode($keyval[1]); } // read the IPN message sent from PayPal and prepend 'cmd=_notify-validate' $req = 'cmd=_notify-validate'; if (function_exists('get_magic_quotes_gpc')) { $get_magic_quotes_exists = true; } foreach ($myPost as $key => $value) { if ($get_magic_quotes_exists == true && get_magic_quotes_gpc() == 1) { $value = urlencode(stripslashes($value)); } else { $value = urlencode($value); } $req .= "&$key=$value"; } // Step 2: POST IPN data back to PayPal to validate $ch = curl_init('https://ipnpb.paypal.com/cgi-bin/webscr'); curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1); curl_setopt($ch, CURLOPT_POST, 1); curl_setopt($ch, CURLOPT_RETURNTRANSFER,1); curl_setopt($ch, CURLOPT_POSTFIELDS, $req); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1); curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2); curl_setopt($ch, CURLOPT_FORBID_REUSE, 1); curl_setopt($ch, CURLOPT_HTTPHEADER, array('Connection: Close')); // In wamp-like environments that do not come bundled with root authority certificates, // please download 'cacert.pem' from "https://curl.haxx.se/docs/caextract.html" and set // the directory path of the certificate as shown below: // curl_setopt($ch, CURLOPT_CAINFO, dirname(__FILE__) . '/cacert.pem'); if ( !($res = curl_exec($ch)) ) { // error_log("Got " . curl_error($ch) . " when processing IPN data"); curl_close($ch); exit; } curl_close($ch); if (strcmp ($res, "VERIFIED") == 0) { return 'true'; } else if (strcmp ($res, "INVALID") == 0) { return 'false'; }

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