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How to integrate PayPal express check?

I am developing a wordpress plugin that needs PayPal Express validation feature.

I followed this article from the PayPal website on how to integrate the check function inside the context ( https://developer.paypal.com/webapps/developer/docs/classic/express-checkout/integration-guide/ECGettingStarted/#id53620a28-e357-474444 -9979-66ed5c592183 ), which gave me the following form in 1 step.

<form method=post action=https://api-3t.sandbox.paypal.com/nvp>
    <input type=hidden name=USER value=API_username>
    <input type=hidden name=PWD value=API_password>
    <input type=hidden name=SIGNATURE value=API_signature>
    <input type=hidden name=VERSION value=XX.0>
    <input type=hidden name=PAYMENTREQUEST_0_PAYMENTACTION value=Sale>
    <input name=PAYMENTREQUEST_0_AMT value=19.95>
    <input type=hidden name=RETURNURL value=https://www.YourReturnURL.com>
    <input type=hidden name=CANCELURL value=https://www.YourCancelURL.com>
    <input type=submit name=METHOD value=SetExpressCheckout>
</form>

I added my own name API_username, API_password and API_Signature from PayPal, but it is displayed when it is presented ACK=Failure.

The following is the message from paypal that I receive:

TIMESTAMP=2015%2d10%2d30T05%3a27%3a09Z&CORRELATIONID=24cb45b8dd36b&ACK=Failure&VERSION=0%2e000000&BUILD=18308778&L_ERRORCODE0=10002&L_SHORTMESSAGE0=Security%20error&L_LONGMESSAGE0=Security%20header%20is%20not%20valid&L_SEVERITYCODE0=Error

Because of this, I cannot go to step 2 in the PayPal documentation, so you need help here. What am I doing wrong?

+4
3

, , .

PHP:

$paypal_url='https://www.paypal.com/cgi-bin/webscr'; 
$paypal_id='example@example.com';

HTML:

<form action='<?php echo $paypal_url; ?>' method='post' name='frmPayPal1'>
    <input type='hidden' name='business' value='<?php echo $paypal_id;?>'>
    <input type='hidden' name='cmd' value='_xclick'>
    <input type='hidden' name='item_name' value='Products Total'>
    <input type='hidden' name='amount' value='<?php echo $tot;?>'>
    <input type='hidden' name='no_shipping' value='1'>
    <input type='hidden' name='currency_code' value='USD'>
    <input type='hidden' name='handling' value='0'>
    <input type='hidden' name='cancel_return' value='http://localhost/paypal/cancel.php'>
    <input type='hidden' name='return' value='http://localhost/paypal/success.php'>
    <input type="image" src="https://www.sandbox.paypal.com/en_US/i/btn/btn_buynowCC_LG.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!">
    <img alt="" border="0" src="https://www.sandbox.paypal.com/en_US/i/scr/pixel.gif" width="1" height="1">
</form>
+9

PayPal Express Checkout, (PHP, ASP.Net,...). , , HTML-, . 3 API .

API.

+4

API PayPal Express Checkout.

, wordpress. , , IPN . , . , , , wordpress !

. (PHP), ( ):

// Parameters for SetExpressCheckout, which will be sent to PayPal

$padata['L_BILLINGAGREEMENTDESCRIPTION0']   = 'Product description';
$padata['L_BILLINGAGREEMENTDESCRIPTION0']   = $padata['L_BILLINGAGREEMENTDESCRIPTION0'] . 
' $'.$product->price.'/month';
$padata['L_PAYMENTREQUEST_0_DESC0']     = $padata['L_BILLINGAGREEMENTDESCRIPTION0'] . 
' $'.$product->price.'/month';
$padata['PAYMENTREQUEST_0_NOTIFYURL']         = 'http://site_url/paypal/ipn';
$padata['PAYMENTREQUEST_0_DESC']            = $product->name;
$padata['RETURNURL']                        = 'http://site_url/paypal/returnurl';
$padata['CANCELURL']                        = 'http://site_url/paypal/cancelurl';

$padata['PAYMENTREQUEST_0_CURRENCYCODE']    = 'USD';
$padata['PAYMENTREQUEST_0_PAYMENTACTION']   = 'SALE';
$padata['PAYMENTREQUEST_0_ITEMAMT']     = $product->price;
$padata['PAYMENTREQUEST_0_AMT']          = $product->price;
$padata['L_BILLINGTYPE0']                    = 'RecurringPayments';
$padata['L_PAYMENTREQUEST_0_NAME0']         = $product->name;
$padata['L_PAYMENTREQUEST_0_NUMBER0']      = '322';
$padata['L_PAYMENTREQUEST_0_QTY0']        = '1';
$padata['L_PAYMENTREQUEST_0_AMT0']          = $product->price;
$padata['L_PAYMENTREQUEST_0_NAME1']        = 'Second Product name';
$hosteddata['L_PAYMENTREQUEST_0_DESC1']    = 'second product description';
$hosteddata['L_PAYMENTREQUEST_0_NUMBER1']  = $secondproduct->id;
$hosteddata['L_PAYMENTREQUEST_0_QTY1']      = '1';
$hosteddata['L_PAYMENTREQUEST_0_AMT1']      = $secondproduct->price;

$paypal_data            = http_build_query($padata);
$httpParsedResponseAr   = $this->PPHttpPost('SetExpressCheckout', $paypal_data);

//Respond according to message we receive from Paypal
if("SUCCESS" == strtoupper($httpParsedResponseAr["ACK"]) || "SUCCESSWITHWARNING" == strtoupper($httpParsedResponseAr["ACK"])){

    //Redirect user to PayPal store with Token received.
    $paypalurl ='https://www.paypal.com/cgi-bin/webscr?cmd=_express-checkout&token='.$httpParsedResponseAr["TOKEN"].'';
    header('Location: '.$paypalurl);

}else{
    echo 'Error : '.urldecode($httpParsedResponseAr["L_LONGMESSAGE0"]).'';


}

returnurl:

$hosteddata['L_BILLINGAGREEMENTDESCRIPTION0']   = 'Recurring Description';
$hosteddata['L_BILLINGAGREEMENTDESCRIPTION0']   = $hosteddata['L_BILLINGAGREEMENTDESCRIPTION0'] . ' $'.$pr->price.'/month';
$hosteddata['L_PAYMENTREQUEST_0_NAME0']         = $pr->name;
$hosteddata['PROFILEREFERENCE']                 = $GetExpressCheckoutDetails['L_PAYMENTREQUEST_0_NUMBER0'];
$hosteddata['PROFILESTARTDATE']               = date('Y-m-d') . 'T' . date('H:i:s').'Z';
$hosteddata['SUBSCRIBERNAME']                    = $GetExpressCheckoutDetails['FIRSTNAME'] . ' ' . $GetExpressCheckoutDetails['LASTNAME'];
$hosteddata['TOKEN']                               = urlencode($_POST['token']);
$hosteddata['DESC']                              = $hosteddata['L_BILLINGAGREEMENTDESCRIPTION0'];
$hosteddata['AMT']                               = $pr->price;
$hosteddata['BILLINGPERIOD']                  = 'Month';
$hosteddata['BILLINGFREQUENCY']                  = '1';
$hosteddata['TOTALBILLINGCYCLES']                = '12';
$hosteddata['REGULARTOTALBILLINGCYCLES']        = '1';
$hosteddata['VERSION']                           = '74.0';
$hosteddata['MAXFAILEDPAYMENTS']              = '1';
$hosteddata['L_PAYMENTREQUEST_0_QTY0']           = '1';
$hosteddata['L_BILLINGTYPE0']                    = 'RecurringPayments';
$hosteddata['L_PAYMENTREQUEST_0_ITEMCATEGORY0']  = 'Digital';
$hosteddata['L_PAYMENTREQUEST_0_AMT0']         = $pr->price;
$hosteddata['INITAMT']                            = $pr->price;
$hosteddata['L_PAYMENTREQUEST_0_NUMBER0']     = $pr->id;
$hosteddata['PAYMENTREQUEST_0_NOTIFYURL']        = 'http://site_url/paypal/ipn';

$padata['L_PAYMENTREQUEST_0_NAME1']      = 'Second Product name';
$hosteddata['L_PAYMENTREQUEST_0_DESC1']         = 'second product description';
$hosteddata['L_PAYMENTREQUEST_0_NUMBER1']       = $secondproduct->id;
$hosteddata['L_PAYMENTREQUEST_0_QTY1']            = '1';
$hosteddata['L_PAYMENTREQUEST_0_AMT1']           = $secondproduct->price;

$paypal_data = http_build_query($hosteddata);
$hosted_saas_response = $this->PPHttpPost('CreateRecurringPaymentsProfile', $paypal_data);

paypal

private function PPHttpPost( $methodName_, $nvpStr_ ) {

$api_username   = 'yourpaypal@email.com';
$api_password   = 'QWEQWEWQEQWEQEQWE';
$api_signature   = 'WQEQWEQWEQWEWQEQWEQWEQWEQWEQWE.cT';
$api_endpoint    = "https://api-3t.paypal.com/nvp";
$version     = '124.0';

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $api_endpoint);
curl_setopt($ch, CURLOPT_VERBOSE, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

curl_setopt($ch, CURLOPT_POST, 1);

$nvpreq = "METHOD=$methodName_&VERSION=$version&PWD=$api_password&USER=$api_username&SIGNATURE=$api_signature&$nvpStr_";

curl_setopt($ch, CURLOPT_POSTFIELDS, $nvpreq);
$httpResponse = curl_exec($ch);

if(!$httpResponse) {
    exit("$methodName_ failed: ".curl_error($ch).'('.curl_errno($ch).')');
}

// Extract the response details.
$httpResponseAr = explode("&", $httpResponse);

$httpParsedResponseAr = array();

foreach ($httpResponseAr as $i => $value) {
    $tmpAr = explode("=", $value);
    if(sizeof($tmpAr) > 1) {
      $httpParsedResponseAr[$tmpAr[0]] = $tmpAr[1];
    }

}

if((0 == sizeof($httpParsedResponseAr)) || !array_key_exists('ACK', $httpParsedResponseAr)) {
  exit("Invalid HTTP Response for POST request($nvpreq) to $api_endpoint.");

}

return $httpParsedResponseAr;

}
+4

Source: https://habr.com/ru/post/1613791/

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