title: How to make certificate in OpenSSL to work with php?
body: <p>Recently i decided to add banklink payment option for my php store and after reading specifications of implementation everything seems okey, but the 1 point of it. All public key(certificates) exchange are in X509 format. Now what does that last one mean and how it's different from regular password protected .pem file?
  Also with regular password protected .pem file i cannot use php function like <code>openssl_verify()</code> signed by <code>openssl_sign()</code> function.</p>
  
  <p>Could i get some advice here please since the bank that offering this payment method has very little information on this and im totally newb to this.</p>
  
  <p>So the routine i need to do here is generate request.pem for them and send it to them. After that they will sign it or whatever i dunno and i should be able to use it in my application.</p>
  
  <p>Please, tell me if my information is not enough because as i told i don't know much when in comes to certificates or openssl.</p>