Hi there,
I can help you with this project as I am an expert mobile developer with significant skills in both Laravel and Flutter. But first, let me clear one thing for you, Only source code doesn't do anything. You have to buy plugins, a host, a payment method API (if you want to integrate one), and if you are looking for a great app, a theme also. And as for the designs to work on, if you have anything, please let me know. I can design and develop this app for you and will demonstrate my methods to you. Please share the details like what the app is for and its functionalities in chat.
Looking forward to your response.
Regards,
Taha.