NSS：使用Paypal和CURL找不到客户证书（昵称未指定）

I have paypal payment API integrated, From today its showing me error like NSS: client certificate not found (nickname not specified). I have tried few solutions available here but not able to sort it out.

We have OPEN SSL enable on the server and using CentOs 6.x. Try to upgrade the OS again the same result.

We are on sandbox mode and running our server on IP as our domain yet to map. Any help will be appreciated.

You have to pass following parameters in Curl call if you are using Curl. Plus take care if you have any extra space in json data.

something like this:

 $ch = curl_init();
 curl_setopt($ch, CURLOPT_URL, "https://api.sandbox.paypal.com/v1/payments/payment");
  curl_setopt($ch, CURLOPT_POST, true);
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
  curl_setopt($ch, CURLOPT_POSTFIELDS, CARD_DATA_OBJECT);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
 curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: application/json","Authorization: Bearer ".PAYPAL_TOKEN));

Hope it's helpful to you.