vendor/braintree/braintree_php/lib/Braintree/WebhookNotificationGateway.php

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<?php

namespace Braintree;

/**
 * Braintree WebhookNotificationGateway
 * Manages Webhooks
 */
class WebhookNotificationGateway
{
    // phpcs:ignore PEAR.Commenting.FunctionComment.Missing
    public function __construct($gateway)
    {
        $this->config = $gateway->config;
        $this->config->assertHasAccessTokenOrKeys();
    }

    /**
     * Parses a webhook from the Braintree API
     *
     * @param string $signature used to verify before parsing
     * @param mixed  $payload   to be parsed
     *
     * @throws Exception\InvalidSignature
     *
     * @return WebhookNotification object
     */
    public function parse($signature, $payload)
    {
        if (is_null($signature)) {
            throw new Exception\InvalidSignature("signature cannot be null");
        }

        if (is_null($payload)) {
            throw new Exception\InvalidSignature("payload cannot be null");
        }

        if (preg_match("/[^A-Za-z0-9+=\/\n]/", $payload) === 1) {
            throw new Exception\InvalidSignature("payload contains illegal characters");
        }

        self::_validateSignature($signature, $payload);

        $xml = base64_decode($payload);
        $attributes = Xml::buildArrayFromXml($xml);
        return WebhookNotification::factory($attributes['notification']);
    }

    /*
     * Verify a webhook challenge
     *
     * @param object $challenge to be verified
     *
     * @throws Exception\InvalidChallenge
     *
     * @return string
     */
    public function verify($challenge)
    {
        if (!preg_match('/^[a-f0-9]{20,32}$/', $challenge)) {