Set Payment Method "PayPal" on Particular State Only in Magento

If you want to disable a specfic payment method for specfic State then follow these steps. 1.Make a new file in app/etc/module/Arunendra_Disablepayment.xml copy and Paste below code in that file

<?xml version="1.0"?>


     
        true
        local
     

2.Now make module folder inside app/code/local/Arunendra/Disablepayment 3.Make new folder and file inside app/code/local/Arunendra/Disablepayment/etc/config.xml and copy and paste below code in that file.

<?xml version="1.0"?>

    
         
            1.0.1
         
    
    
        
            
            Arunendra_Disablepayment_Model
            
        
    
    
        
            
                
                    
                        singleton
                        disablepayment/observer
                        filterpaymentmethod
                    
                
            
        
    

4.Make new folder and file inside app/code/local/Arunendra/Disablepayment/Model/Observer.php and copy and paste below code in that file.

<?php
class Arunendra_Disablepayment_Model_Observer {
 public function filterpaymentmethod(Varien_Event_Observer $observer) {
            /* call get payment method */
        $method = $observer->getEvent()->getMethodInstance();
		/* you can put your own  payment method code here */
        if($method->getCode()=='paypal_express'){
            $quote = $observer->getEvent()->getQuote();
            $shippingAddress = $quote->getShippingAddress();
            $RegionId=$shippingAddress->getRegionId();
            if($RegionId=='yourregioncode'){
            $result = $observer->getEvent()->getResult();   
            $result->isAvailable = true;
            return;
            }
            else{
            $result = $observer->getEvent()->getResult();   
            $result->isAvailable = false;
            }

        }
        return;
    }
}

it's done.!