PayPal Billing REST Api Php issue - php

Question

I have an issue with Paypal REST Api billing (recurring payments).
I did exactly as in paypal documentation but when I click payment button it opens blank page (no errors in the error log).
Here is what I do:
Front End Button
<form action="WEBSITE/subscribe/paypal/paypal_agreement.php" method="POST">
<button type="submit" style="margin-top:10px;border: 0; background: transparent">
<img src="WEBSITE/wp-content/uploads/2017/05/paypal.png" style = "width:170px;" alt="submit" />
</button>
</form>
paypal_agreement.php (copy/paste from paypal docs)
<?php
require_once("../../paypal/vendor/autoload.php");
$createdPlan = require 'paypal_createplan.php';
use PayPal\Api\Agreement;
use PayPal\Api\Payer;
use PayPal\Api\Plan;
use PayPal\Api\ShippingAddress;
$ppstartdate = date('c', time()+210);
$agreement = new Agreement();
$agreement->setName('Title Agreement')
->setDescription('Description Agreement')
->setStartDate($ppstartdate);
// Add Plan ID
// Please note that the plan Id should be only set in this case.
$plan = new Plan();
$plan->setId($createdPlan->getId());
$agreement->setPlan($plan);
// Add Payer
$payer = new Payer();
$payer->setPaymentMethod('paypal');
$agreement->setPayer($payer);
// ### Create Agreement
try {
// Please note that as the agreement has not yet activated, we wont be receiving the ID just yet.
$agreement = $agreement->create($apiContext);
// ### Get redirect url
// The API response provides the url that you must redirect
// the buyer to. Retrieve the url from the $agreement->getApprovalLink()
// method
$approvalUrl = $agreement->getApprovalLink();
header("Location: ".$approvalUrl);
} catch (Exception $ex) {
exit(1);
}
return $agreement;
?>
paypal_createplan.php (copy/paste from paypal docs)
<?php
require_once("../../paypal/vendor/autoload.php");
use PayPal\Api\Currency;
use PayPal\Api\MerchantPreferences;
use PayPal\Api\PaymentDefinition;
use PayPal\Api\Plan;
// Create a new instance of Plan object
$plan = new Plan();
// # Basic Information
// Fill up the basic information that is required for the plan
$plan->setName('Title Plan')
->setDescription('Description Subscription Plan')
->setType('fixed');
// # Payment definitions for this billing plan.
$paymentDefinition = new PaymentDefinition();
// The possible values for such setters are mentioned in the setter method documentation.
// Just open the class file. e.g. lib/PayPal/Api/PaymentDefinition.php and look for setFrequency method.
// You should be able to see the acceptable values in the comments.
$paymentDefinition->setName('Regular Payments')
->setType('REGULAR')
->setFrequency('Month')
->setFrequencyInterval("1")
->setCycles("6")
->setAmount(new Currency(array('value' => 94.99, 'currency' => 'USD')));
$merchantPreferences = new MerchantPreferences();
$baseUrl = "https://websitelink.com";
$merchantPreferences->setReturnUrl("$baseUrl/subscribe/paypal/execute.php?success=true")
->setCancelUrl("$baseUrl/subscribe/paypal/execute.php?success=false")
->setAutoBillAmount("yes")
->setInitialFailAmountAction("CONTINUE")
->setMaxFailAttempts("0")
->setSetupFee(new Currency(array('value' => 0, 'currency' => 'USD')));
// ### Create Plan
try {
$output = $plan->create($apiContext);
} catch (Exception $ex) {
exit(1);
}
return $output;
?>
execute.php (copy/paste from paypal docs)
<?php
// #Execute Agreement
// This is the second part of CreateAgreement Sample.
// Use this call to execute an agreement after the buyer approves it
require_once("../../paypal/vendor/autoload.php");
// ## Approval Status
// Determine if the user accepted or denied the request
if (isset($_GET['success']) && $_GET['success'] == 'true') {
$token = $_GET['token'];
$agreement = new \PayPal\Api\Agreement();
try {
// ## Execute Agreement
// Execute the agreement by passing in the token
$agreement->execute($token, $apiContext);
} catch (Exception $ex) {
exit(1);
}
// ## Get Agreement
// Make a get call to retrieve the executed agreement details
try {
$agreement = \PayPal\Api\Agreement::get($agreement->getId(), $apiContext);
//done
header('Location: https://websitelink.com/subscribe/subscribe.php');
} catch (Exception $ex) {
exit(1);
}
} else {
$_SESSION['pmsg'] = $_SESSION['pmsg'].'<h2>Subscription Failed</h2>';
}
But I couldn't find anything about authentication OAuth2 (as for example with express checkout), nothing in documentation. Maybe it doesn't work because of that?

Answer 1

Variable $apiContext should contain paypal app authentication & setConfig

Answer 2

Is this: "Variable $apiContext should contain paypal app authentication & setConfig"
the solution to this issue?: I have an issue with Paypal REST Api billing (recurring payments). I did exactly as in paypal documentation but when I click payment button it opens blank page (no errors in the error log).
I am having a similiar issue. Pls confirm. And how do we get the paypal app authentication & setConfig?