Laravel Checkout Payment Integration Expert

We are looking for a payment integration expert to implement a secure payment system within a custom Laravel checkout flow, without using a fully hosted payment page.

The solution must ensure PCI DSS compliance (SAQ A) by keeping all card data out of our servers and application.

It should also support:

- Strong Customer Authentication (3D Secure 2)
- Trial payments
- Subscriptions and recurring billing
- Secure signed webhooks for payment event synchronization

This integration involves Paysagi, a merchant of record payment gateway.

The goal is to deliver a robust, compliant, and scalable integration while maintaining a smooth user experience in a fully custom checkout.