Petar Vasilev

<?php

namespace App\Logic\Paypal;

use Exception;
use App\Setting;
use PayPal\Api\Currency;
use PayPal\Api\MerchantPreferences;
use PayPal\Api\PaymentDefinition;
use PayPal\Api\Plan;
use PayPal\Api\Patch;
use PayPal\Api\PatchRequest;
use PayPal\Api\VerifyWebhookSignature;
use PayPal\Api\Webhook;
use PayPal\Auth\OAuthTokenCredential;
use PayPal\Common\PayPalModel;
use PayPal\Api\Agreement;
use PayPal\Api\Payer;
use PayPal\Rest\ApiContext;

class Paypal {

    public $apiContext;

    public function __construct()
    {
        $this->apiContext = new ApiContext(
            new OAuthTokenCredential(
                config('services.paypal.client_id'),     // ClientID
                config('services.paypal.secret')
            )
        );
    }

    public function createPlan()
    {
        $monthlyAmount = 10;
        $currency = 'EUR';

        // 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('Epic Plan')
            ->setDescription('Unlimited form submissions. €10 paid monthly.')
            ->setType('infinite');

        // # Payment definitions for this billing plan.
        $paymentDefinition = new PaymentDefinition();

        $paymentDefinition->setName('Regular Payments')
            ->setType('REGULAR')
            ->setFrequency('Day')
            ->setFrequencyInterval("1")
            ->setCycles("0")
            ->setAmount(new Currency(array('value' => $monthlyAmount, 'currency' => $currency)));

        $merchantPreferences = new MerchantPreferences();
        $baseUrl = env('APP_URL');

        $merchantPreferences->setReturnUrl("$baseUrl/paypal/execute-agreement?success=true")
            ->setCancelUrl("$baseUrl/paypal/execute-agreement?success=false")
            ->setAutoBillAmount("yes")
            ->setInitialFailAmountAction("CONTINUE")
            ->setMaxFailAttempts("0")
            ->setSetupFee(new Currency(array('value' => $monthlyAmount, 'currency' => $currency)));

        $plan->setPaymentDefinitions(array($paymentDefinition));
        $plan->setMerchantPreferences($merchantPreferences);

        // ### Create Plan
        $output = $plan->create($this->apiContext);

        return $output;
    }

    public function activatePlan()
    {
        $createdPlan = $this->createPlan();

        $patch = new Patch();

        $value = new PayPalModel('{
           "state":"ACTIVE"
         }');

        $patch->setOp('replace')
            ->setPath('/')
            ->setValue($value);
        $patchRequest = new PatchRequest();
        $patchRequest->addPatch($patch);

        $createdPlan->update($patchRequest, $this->apiContext);

        $plan = Plan::get($createdPlan->getId(), $this->apiContext);

        // try to find previous setting with plan id
        $setting = Setting::where('name', '=', 'active_plan_id')->first();

        // save the plan id in the database
        if ($setting) {
            $setting->value = $plan->getId();
            $setting->save();
        } else {
            $newSetting = new Setting(
                [
                    'name' => 'active_plan_id',
                    'value' => $plan->getId(),
                ]
            );

            $newSetting->save();
        }

        return $plan;
    }

    public function createBillingAgreement()
    {
        $setting = Setting::where('name', '=', 'active_plan_id')->first();

        if (! $setting) {
            throw new Exception('Active plan id not found.');
        }

        $activePlanId = $setting->value;

        $agreement = new Agreement();

        $dateAgreementStarts = gmdate("Y-m-d\TH:i:s\Z", time() + 120);
        $agreement->setName('Base Agreement')
            ->setDescription('€10 a month in return for accessing our unlimited plan.')
            ->setStartDate($dateAgreementStarts);

        // Add Plan ID
        // Please note that the plan Id should be only set in this case.
        $plan = new Plan();
        $plan->setId($activePlanId);
        $agreement->setPlan($plan);

        // Add Payer
        $payer = new Payer();
        $payer->setPaymentMethod('paypal');
        $agreement->setPayer($payer);

        // ### Create Agreement
        // Please note that as the agreement has not yet activated, we wont be receiving the ID just yet.
        $agreement = $agreement->create($this->apiContext);

        // ### Get redirect url
        $approvalUrl = $agreement->getApprovalLink();

        return redirect($approvalUrl);
    }

    /**
     * Get list of all webhooks
     *
     * @return \PayPal\Api\WebhookList
     */
    public function listAllWebhooks()
    {
        $output = Webhook::getAllWithParams([], $this->apiContext);

        return $output;
    }

    /**
     * Delete all webhooks
     *
     * @return bool
     */
    public function deleteAllWebhooks()
    {
        $webhookList = $this->listAllWebhooks();

        foreach ($webhookList->getWebhooks() as $webhook) {
            $webhook->delete($this->apiContext);
        }

        return true;
    }

    /**
     * Register primary webhooks
     *
     * @return Webhook|string
     */
    public function registerPrimaryWebhooks()
    {
        $setting = Setting::where('name', '=', 'primary_webhooks_registered')->first();

        if ($setting) {
            return 'primary webhooks already registered';
        }

        $baseUrl = env('APP_URL');
        $webhook = new Webhook();
        $webhook->setUrl("$baseUrl/paypal/webhooks/primary");

        // # Event Types
        // Event types correspond to what kind of notifications you want to receive on the given URL.
        $webhookEventTypes = array();
        $webhookEventTypes[] = new \PayPal\Api\WebhookEventType(
            '{
                "name":"PAYMENT.AUTHORIZATION.CREATED"
            }'
        );
        $webhookEventTypes[] = new \PayPal\Api\WebhookEventType(
            '{
                "name":"PAYMENT.AUTHORIZATION.VOIDED"
            }'
        );
        $webhook->setEventTypes($webhookEventTypes);

        // ### Create Webhook
        $output = $webhook->create($this->apiContext);

        $newSetting = new Setting(
            [
                'name' => 'primary_webhooks_registered',
                'value' => $output->getId(),
            ]
        );
        $newSetting->save();

        return $output;
    }

    public function validatePrimaryWebhooks()
    {
        $setting = Setting::where('name', '=', 'primary_webhooks_registered')->first();

        if (! $setting) {
            throw new Exception('Primary webhooks not registered.');
        }

        $webhookId = $setting->value;

        $requestBody = file_get_contents('php://input');
        $headers = getallheaders();

        $headers = array_change_key_case($headers, CASE_UPPER);

        $signatureVerification = new VerifyWebhookSignature();
        $signatureVerification->setAuthAlgo($headers['PAYPAL-AUTH-ALGO']);
        $signatureVerification->setTransmissionId($headers['PAYPAL-TRANSMISSION-ID']);
        $signatureVerification->setCertUrl($headers['PAYPAL-CERT-URL']);
        $signatureVerification->setWebhookId($webhookId);
        $signatureVerification->setTransmissionSig($headers['PAYPAL-TRANSMISSION-SIG']);
        $signatureVerification->setTransmissionTime($headers['PAYPAL-TRANSMISSION-TIME']);

        $signatureVerification->setRequestBody($requestBody);

        $output = $signatureVerification->post($this->apiContext);

        $status = $output->getVerificationStatus();

        (new Setting(
            [
                'name' => 'webhook ' . date('Y-m-d H:i:s'),
                'value' => $status . $requestBody,
            ]
        ))->save();

        return response()->json([
            'status' => 'OK'
        ]);
    }
}

<?php

namespace App\Http\Controllers;

use App\Setting;
use App\Logic\Paypal\Paypal;
use Illuminate\Http\Request;
use PayPal\Api\Agreement;

class PaypalController extends Controller
{
    public function createAndActivatePlan()
    {
        $setting = Setting::where('name', '=', 'active_plan_id')--->first();

        if ($setting) {
            return 'plan already activated';
        }

        $paypal = new Paypal();
        $plan = $paypal->activatePlan();

        if ($plan) {
            return 'success';
        } else {
            return 'failure';
        }
    }

    public function redirectToPaypal()
    {
        $paypal = new Paypal();

        return $paypal->createBillingAgreement();
    }

    public function executeAgreement()
    {
        // ## Approval Status
        // Determine if the user accepted or denied the request
        if (isset($_GET['success']) && $_GET['success'] == 'true') {
            $paypal = new Paypal();
            $token = $_GET['token'];
            $agreement = new Agreement();

            // ## Execute Agreement
            // Execute the agreement by passing in the token
            $agreement->execute($token, $paypal->apiContext);

            // ## Get Agreement
            // Make a get call to retrieve the executed agreement details
            $agreement = Agreement::get($agreement->getId(), $paypal->apiContext);

            dd($agreement);
        }
    }

    public function registerPrimaryWebhooks()
    {
        $paypal = new Paypal();

        return $paypal->registerPrimaryWebhooks();
    }

    public function handlePrimaryWebhooks()
    {
        $paypal = new Paypal();

        return $paypal->validatePrimaryWebhooks();
    }
}

<?php

// PayPal
Route::get('/paypal/create-and-activate-plan', 'PaypalController@createAndActivatePlan');
Route::get('/paypal/register-primary-webhooks', 'PaypalController@registerPrimaryWebhooks');
Route::get('/paypal/redirect-to-paypal', 'PaypalController@redirectToPaypal');
Route::get('/paypal/execute-agreement', 'PaypalController@executeAgreement');
Route::post('/paypal/webhooks/primary', 'PaypalController@handlePrimaryWebhooks');