edit functions in laravel project

hi how are you
i need add new functions in laravel project
i have project system wallet
PayMoney - Secure Online Payment Gateway
___________
project idea
Send money via e-mail or the customer's phone number
I need to change this functions to
Send money through the owner of a specific code that contains 4 digits
These are 4 numbers associated with the user
I mean, for example, User X has 4 clients
When he wants to send to a specific client
You only show him 4 clients
And user y does not show him this