WebhookHandler.php

<?php
namespace WPGraphQL\Webhooks\Handlers;

use WPGraphQL\Webhooks\Entity\Webhook;
use WPGraphQL\Webhooks\Handlers\Interfaces\Handler;

/**
 * Class WebhookHandler
 *
 * Sends the webhook to the configured URL when an event is triggered.
 */
class WebhookHandler implements Handler {

	/**
	 * Handle the event payload for a specific webhook.
	 *
	 * @param Webhook $webhook The Webhook entity instance.
	 * @param array   $payload The event payload data.
	 *
	 * @return void
	 */
	public function handle( Webhook $webhook, array $payload ): void {
		$args = [ 
			'headers' => $webhook->headers ?: [ 'Content-Type' => 'application/json' ],
			'timeout' => 5,
			'blocking' => false,
		];
        $payload = apply_filters( 'graphql_webhooks_payload', $payload, $webhook );

		if ( strtoupper( $webhook->method ) === 'GET' ) {
			$url = add_query_arg( $payload, $webhook->url );
			$args['method'] = 'GET';
		} else {
			$url = $webhook->url;
			$args['method'] = 'POST';
			$args['body'] = wp_json_encode( $payload );
			if ( empty( $args['headers']['Content-Type'] ) ) {
				$args['headers']['Content-Type'] = 'application/json';
			}
		}
		wp_remote_request( $url, $args );
		do_action( 'graphql_webhooks_sent', $webhook, $payload );
	}
}