Hello, I understand that you are looking for someone to integrate with a new payment gateway and keep the backend's callback API reusable while migrating to the new PG.
With over 9 years of web technology experience and a skilled workforce of competent professionals, we at GlobalTechnosys are confident that we can provide the best solution for this project. Our development centers are located in Western Region and employ 60+ professionals and consultants who have extensive knowledge in payment gateway integration and other related technologies such as Zend, CodeIgniter, Cake PHP, OpenCart, Joomla and WordPress. Additionally, our successful execution of over 3000+ projects makes us a reliable choice for this job. Moreover, our competitive prices along with strong customer orientation and commitment to quality make us an ideal choice for this project.
If you feel our skillset matches the requirements of this project please feel free to reach out to us directly so we can discuss further how we can make your project successful together. Thank you for your time!