I have three models: Payment, Booking and Customer. A payment relation belongs to the Booking model and the Booking model belongs to the Customer model. 

I need to make a customer relation inside the Payment model, however, they are not related, the only relation between them is through the Booking model.

My code: 

```php
public function booking(){
        return $this->belongsTo(Booking::class , 'payable_id' , 'id')->with('customer');
    }

// what i need , i need to consume that booking function to get customer info 
// something like this 
public function customer(){
      // consume the booking relation 
      // return customer info
}

```

Could you please advise me on the right approach?