CODEWITHSUNDEEP
phpcurlpaypal
m90
m90

Reputation: 11822

Cannot connect to PayPal API via cURL

I'm trying to set up PayPal Express Payment via the "Classic" NVP API.

Trying to connect from my server to the PayPal-Sandbox using cURL, the connection stalls and times out after about 2 minutes.

I'm using the example call from the docs:

curl -v --insecure  https://api-3t.sandbox.paypal.com/nvp  -d  "USER=platfo_1255077030_biz_api1.gmail.com&PWD=1255077037&SIGNATURE=Abg0gYcQyxQvnf2HDJkKtA-p6pqhA1k-KTYE0Gcy1diujFio4io5Vqjf&METHOD=SetExpressCheckout&VERSION=78&PAYMENTREQUEST_0_PAYMENTACTION=SALE&PAYMENTREQUEST_0_AMT=19&PAYMENTREQUEST_0_CURRENCYCODE=USD&cancelUrl=http://www.yourdomain.com/cancel.html&returnUrl=http://www.yourdomain.com/success.html"

Shell output is: 

* About to connect() to api-3t.sandbox.paypal.com port 443 (#0)
* Trying 173.0.82.83... Connection timed out
* couldn't connect to host
* Closing connection #0
curl: (7) couldn't connect to host

When I try to do this via PHP curl I don't get any errors and simply an empty resource handle.

I can easily do the requests (and get the correct data back) from my local machine and from other servers that I can access so I guess this is some server side misconfiguration going on. Not being a server person I am a little clueless.

cURL is enabled and logs the following in phpinfo:

libcurl/7.21.0 OpenSSL/0.9.8o zlib/1.2.3.4 libidn/1.15 libssh2/1.2.6

openSSL is enabled as well. Also, I'm having the same issues when trying to connect to the live version of the API.

Upvotes: 14

Views: 11321

Answers (5)

Tanzil Hussain
Tanzil Hussain

Reputation: 1

In my case, I have enabled ICMP Traffic in my server right now curl and get working perfectly.

iptables -P INPUT ACCEPT; iptables -P OUTPUT ACCEPT
iptables -F INPUT; iptables -F OUTPUT

Upvotes: 0

Cemal
Cemal

Reputation: 1579

Your error is due to your server's version of nss package and api-3t.sandbox.paypal.com using an SNI certificate. You can verify it by executing

openssl s_client -servername api-3t.sandbox.paypal.com -tlsextdebug -connect api-3t.sandbox.paypal.com:443 2>/dev/null | grep "server name"

over bash. The output is TLS server extension "server name" (id=0), len=0 which indicates that this server is with SNI certificate.

The solution is actually simple.

For RedHat variants :

sudo yum -y update nss*

For Debian variants :

sudo apt-get update nss*

You don't really have to change your code( for connection wise problems)

Upvotes: 0

Marwan Salim
Marwan Salim

Reputation: 722

Most probably The PayPal Express Payment service stop/cut your connection because of the wrong authentication or not valid ssl certificate issued. In this case, try to ask the service provider about this issue.

Hopefully, solve your problem.

Upvotes: 0

Korat Prakash
Korat Prakash

Reputation: 161

Try 

$ch = curl_init();
# Merchant Account Credentials
$ppUserID = "User Id Email"; //Take it from sandbox dashboard for test mode or take it from paypal.com account in production mode, help: https://developer.paypal.com/docs/classic/api/apiCredentials/
$ppPass = "User Pass"; //Take it from sandbox dashboard for test mode or take it from paypal.com account in production mode, help: https://developer.paypal.com/docs/classic/api/apiCredentials/
$ppSign = "Paypal Sign"; //Take it from sandbox dashboard for test mode or take it from paypal.com account in production mode, help: https://developer.paypal.com/docs/classic/api/apiCredentials/

$ppAppID = "APP-80W284485P519543T"; //if it is sandbox then app id is always: APP-80W284485P519543T

$paypal_header_options = array();
    $paypal_header_options[] = "X-PAYPAL-SECURITY-USERID: $ppUserID";
    $paypal_header_options[] = "X-PAYPAL-SECURITY-PASSWORD: $ppPass";
    $paypal_header_options[] = "X-PAYPAL-SECURITY-SIGNATURE: $ppSign";
    $paypal_header_options[] = "X-PAYPAL-REQUEST-DATA-FORMAT: NV";
    $paypal_header_options[] = "X-PAYPAL-RESPONSE-DATA-FORMAT: NV";
    $paypal_header_options[] = "X-PAYPAL-APPLICATION-ID: $ppAppID";

$URL = 'https://api-3t.sandbox.paypal.com/nvp'
    .'?USER='.$ppUserID
    .'&PWD='.$ppPass
.'&SIGNATURE='.$ppSign
    .'&METHOD=SetExpressCheckout' 
    .'&VERSION=93'
    .'&RETURNURL=https://localhost/express-checkout-single-product/success.php?success=true'
    .'&CANCELURL=https://localhost/express-checkout-single-product/index.php'
.'&PAYMENTREQUEST_0_CURRENCYCODE=USD'
.'&PAYMENTREQUEST_0_AMT=250.00'    #The payment amount for the first receiver   # Merchant(Primary AC) Account Amount
.'&PAYMENTREQUEST_0_ITEMAMT=225.00'                         # Merchant(Primary AC) Account Email
.'&PAYMENTREQUEST_0_TAXAMT=25.00'    #Receiver designation (there can be only 1 primary receiver)
.'&PAYMENTREQUEST_0_PAYMENTACTION=Order' 
.'&PAYMENTREQUEST_0_SELLERPAYPALACCOUNTID=email' 
.'&PAYMENTREQUEST_0_PAYMENTREQUESTID=CART110-PAYMENT0'    #The payment amount for the second receiver   # Seller(Secondry AC) Account Amount
.'&PAYMENTREQUEST_1_CURRENCYCODE=USD'
.'&PAYMENTREQUEST_1_AMT=75.00'    #The payment amount for the first receiver    # Merchant(Primary AC) Account Amount
.'&PAYMENTREQUEST_1_ITEMAMT=65.00'                          # Merchant(Primary AC) Account Email
.'&PAYMENTREQUEST_1_TAXAMT=10.00'    #Receiver designation (there can be only 1 primary receiver)
.'&PAYMENTREQUEST_1_PAYMENTACTION=Order' 
.'&PAYMENTREQUEST_1_SELLERPAYPALACCOUNTID=email' 
.'&PAYMENTREQUEST_1_PAYMENTREQUESTID=CART110-PAYMENT1' 
    .'&L_PAYMENTREQUEST_0_NAME0=Departs2'
    .'&L_PAYMENTREQUEST_0_NAME0=Sunset'
.'&L_PAYMENTREQUEST_0_QTY0=1'
    .'&L_PAYMENTREQUEST_0_AMT0=125'
    .'&L_PAYMENTREQUEST_0_TAXAMT0=15'
    .'&L_PAYMENTREQUEST_0_NAME1=Departs'
.'&L_PAYMENTREQUEST_0_QTY1=1'
    .'&L_PAYMENTREQUEST_0_AMT1=100.00'
    .'&L_PAYMENTREQUEST_0_TAXAMT1=10.00';
    curl_setopt($ch, CURLOPT_URL, $URL);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  //  curl_setopt($ch, CURLOPT_HTTPHEADER, $paypal_header_options);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

    $paypal_response = curl_exec($ch);

$responseAr = explode('&', $paypal_response);
$parsedResponseAr = array();
foreach($responseAr as $i => $value) {
    $tmpAr = explode('=', $value);
    if(!empty($tmpAr))
        $parsedResponseAr[strtoupper($tmpAr[0])] = urldecode($tmpAr[1]);
}
print_r(json_encode($parsedResponseAr));
curl_close($ch);

Upvotes: 1

Mason.Chase
Mason.Chase

Reputation: 905

A) First try to wget https://api-3t.sandbox.paypal.com/nvp and see if you can get a simple connection with "Bad Request" reply , and if not you have been blocked by Paypal server or your firewall is blocking you on port 443 to access paypal

B) try to add custom header: -H "Host: api-3t.sandbox.paypal.com"

curl -v --insecure https://api-3t.sandbox.paypal.com/nvp -d "USER=platfo_1255077030_biz_api1.gmail.com&PWD=1255077037&SIGNATURE=Abg0gYcQyxQvnf2HDJkKtA-p6pqhA1k-KTYE0Gcy1diujFio4io5Vqjf&METHOD=SetExpressCheckout&VERSION=78&PAYMENTREQUEST_0_PAYMENTACTION=SALE&PAYMENTREQUEST_0_AMT=19&PAYMENTREQUEST_0_CURRENCYCODE=USD&cancelUrl=http://www.yourdomain.com/cancel.html&returnUrl=http://www.yourdomain.com/success.html" -H "Host: api-3t.sandbox.paypal.com"

C) what version of CURL and on what platform are you using? I have:

curl 7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.21 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2

Upvotes: 0

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