Paypal express checkout integration with PayPal REST API - php

Question

I'm trying to integrate Paypal express checkout integration with PayPal REST API.
JS file looks like this:
paypal.Button.render({
env: 'sandbox', // sandbox | production
commit: true,
payment: function() {
var CREATE_URL = 'createpayment';
return paypal.request.get(CREATE_URL)
.then(function(res) {
return res.paymentID;
});
},
onAuthorize: function(data, actions) {
var EXECUTE_URL = 'executepayment';
var data = {
paymentID: data.paymentID,
payerID: data.payerID
};
return paypal.request.post(EXECUTE_URL, data)
.then(function (res) {
window.alert('Payment Complete!');
});
}
}, '#paypal-button-container');
Now I can't figure out what should be in CREATE_URL and EXECUTE_URL url's php files. I have read a lot of their docs. I understand that in php I should make first request to get token, then I should make create-payment request and after execute-payment curl reuqest. But I have no-luck.
I also don't understand how should I pass payment value to CREATE_URL php file.
Several days ago I found here some good answer of my question with all examples, but it's about two days I can't find it.
Update: ALso I need to pass input amount to php file from payment request. And I can't do that using return paypal.request.get(CREATE_URL, data)
request.
Can anybody help me please.
Thank you.

Answer 1

Share some examples for server PHP code.
PHP Code in CREATE_URL:
<?php
$curl = curl_init();
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_URL, 'https://api-3t.sandbox.paypal.com/nvp');
curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query(array(
'USER' => 'xxxxx',
'PWD' => 'xxxxx',
'SIGNATURE' => 'xxxxx',
'METHOD' => 'SetExpressCheckout',
'VERSION' => '108',
'LOCALECODE' => 'en_US',
'PAYMENTREQUEST_0_AMT' => 100,
'PAYMENTREQUEST_0_CURRENCYCODE' => 'USD',
'PAYMENTREQUEST_0_PAYMENTACTION' => 'Sale',
'PAYMENTREQUEST_0_ITEMAMT' => 100,
'L_PAYMENTREQUEST_0_NAME0' => 'test name',
'L_PAYMENTREQUEST_0_DESC0' => 'test desc',
'L_PAYMENTREQUEST_0_QTY0' => 1,
'L_PAYMENTREQUEST_0_AMT0' => 100,
'CANCELURL' => 'http://localhost/cancel.html',
'RETURNURL' => 'http://localhost/success.html'
)));
$response = curl_exec($curl);
curl_close($curl);
$nvp = array();
if (preg_match_all('/(?<name>[^\=]+)\=(?<value>[^&]+)&?/', $response, $matches)) {
foreach ($matches['name'] as $offset => $name) {
$nvp[$name] = urldecode($matches['value'][$offset]);
}
}
if (isset($nvp['ACK']) && $nvp['ACK'] == 'Success') {
echo $nvp['TOKEN'];
} else {
//failed
}
?>
PHP Code in EXECUTE_URL:
<?php
$curl = curl_init();
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_URL, 'https://api-3t.sandbox.paypal.com/nvp');
curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query(array(
'USER' => 'xxxxx',
'PWD' => 'xxxxx',
'SIGNATURE' => 'xxxxx',
'METHOD' => 'DoExpressCheckoutPayment',
'VERSION' => '108',
'LOCALECODE' => 'en_US',
'TOKEN' => $_POST['TOKEN'],
'PayerID' => $_POST['PAYERID'],
'PAYMENTREQUEST_0_AMT' => 100,
'PAYMENTREQUEST_0_CURRENCYCODE' => 'USD',
'PAYMENTREQUEST_0_PAYMENTACTION' => 'Sale',
'PAYMENTREQUEST_0_ITEMAMT' => 100,
'L_PAYMENTREQUEST_0_NAME0' => 'test name',
'L_PAYMENTREQUEST_0_DESC0' => 'test desc',
'L_PAYMENTREQUEST_0_QTY0' => 1,
'L_PAYMENTREQUEST_0_AMT0' => 100,
)));
$response = curl_exec($curl);
curl_close($curl);
$nvp = array();
if (preg_match_all('/(?<name>[^\=]+)\=(?<value>[^&]+)&?/', $response, $matches)) {
foreach ($matches['name'] as $offset => $name) {
$nvp[$name] = urldecode($matches['value'][$offset]);
}
}
print_r($nvp);