How to write a custom model binder

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ASP.NET

I am doing development for a payment screen using asp.net mvc, I have a PaymentModel and want to
use a custom model binder, can someone help me how to implement a custom model binder? Thanks in advance.

Here is model class:

public class PaymentModel
{
    public JobPayment JobPayment {get;set;}

}

Public class JobPayment
{
    public decimal InstallCharge {get;set;}
    public CreditCard creditcard {get;set;}

}

Public class creditCard
{
    public string NameOnCard {get;set;}
    public string AccountNumber {get;set;}
    public Date ExpirationDate {get;set;}

}