PayPal website Payment standard Version (for PHP), PayPal Standard Edition _php tutorial

PayPal website Payment standard Version (for PHP), PayPal Standard Edition

Simply organize your PHP project to integrate PayPal payment functionality.

One, the construction of the form:

<formMethod= "POST"name= "form"Action= "HTTPS://WWW.PAYPAL.COM/CGI-BIN/WEBSCR"><inputtype= "hidden"name= "rm"value= "2"/><inputtype= "hidden"name= "cmd"value= "_xclick"/><inputtype= "hidden"name= "Business"value= "Merchant Account"/><inputtype= "hidden"name= "return"value= "Return url"/><inputtype= "hidden"name= "Cancel_return"value= "Cancel return url"/><inputtype= "hidden"name= "Notify_url"value= "URL to receive instant payment notifications sent by PayPal, must be a valid URL"/><inputtype= "hidden"name= "Item_name"value= "Item Name"/><inputtype= "hidden"name= "Item_Number"value= "can be used to track purchases or donations of transfer variables that are returned to you when payment is completed"/><inputtype= "hidden"name= "Amount"value= "The price of the item (the total price of all items in the shopping cart" )/><inputtype= "hidden"name= "Currency_code"value= "Currency"/> 
    form> 
 

Second, the IPN verification part

 PhpclassPayPal {var $IPN _data=Array();//array contains the POST values for IPN　　 var $fields=Array();//after PayPal receives payment from the customer, PayPal will post the form information back to the customer,
The received post information must be returned to PayPal for verification,
The contents are: Item_name=iphone 6,QUANTITY=1,AMOUNT=499,CURRENCY_CODE=USD and so on all form information,
Pre-initialization is required prior to calling validation IPN. 　　 var $paypal _url= ' HTTPS://WWW.PAYPAL.COM/CGI-BIN/WEBSCR ';//SANDBOX:HTTPS://WWW.SANDBOX.PAYPAL.COM/CGI-BIN/WEBSCR 　　 　　functionVALIDATE_IPN () {//Verify IPN//Parse the PayPal URL 　　　　　　 $url _par=Parse_url($this-Paypal_url); //generate the Post string from the _post VARs aswell as load the//_post VARs to an arry so we can play with T Hem from the calling//script. 　　　　　　 $post _str= ''; foreach($_post  as $field=$value) {$this->ipn_data["$field"] =$value; $post _str.=$field.' ='.UrlEncode(stripslashes($value)).' & '; }$post _str. = "Cmd=_notify-validate";//Append IPN command//Open the connection to PayPal 　　　　　　 $fp=Fsockopen($url _par[Host], "80",$errnum,$errstr, 30); if(!$fp) {//could not open the connection. 　　　　　　　　 return false; } Else{//Post The data back to PayPal 　　　　　　　　 fputs($fp, "POST".$url _par[Path]. " Http/1.1\r\n "); fputs($fp, "Host:".$url _par[Host]. \ r \ n "); fputs($fp, "content-type:application/x-www-form-urlencoded\r\n"); fputs($fp, "Content-length:".strlen($post _str)." \ r \ n "); fputs($fp, "connection:close\r\n\r\n"); fputs($fp,$post _str. "\r\n\r\n"); //Loop through the response from the server and append to variable 　　　　　　　　  while(!feof($fp)) {$this->validate_ipn_response. =fgets($fp, 1024); }fclose($fp);//Close Connection}if(Eregi("Verified",$this-validate_ipn_response)) {return true; } Else{return false; }}}?>

Instant Payment Notice (IPN) is as follows:

1) The customer clicks the "Payment" button to pay for your account;

2) PayPal receives the customer's payment, sends the IPN via POST to the URL specified by your server;

3) After your server receives the IPN, you must return the POST information received to PayPal for verification, PayPal This method to help you prevent spoofing or "man-in-the-middle" attack; (the verification process of IPN information we call the notification confirmation)

4) PayPal Returns verification information, verified as verified, or Invald;

5) According to the Verification information processing payment details.

Related information:

Developer: https://developer.paypal.com/
Instant Payment Notice: https://www.paypal-biz.com/development/documentation/PayPal_IPN&PDT_Guide_V1.0.pdf
PayPal Standard Version: Https://www.paypal-biz.com/development/documentation/PayPal_WPS_Guide_CN_V2.0.pdf

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