Invalid transaction id in paypal recurring

Hi all

I am working with the paypal recurring gem and rails 3.

I am subscribing different plans for a demo site. with “Basic” and “Premium” plans.

I am doing a refund process for test.

def refund_payment
ppr = PayPal::Recurring.new({
:profile_id => self.paypal_recurring_profile_token,
:transaction_id => “#7RX73297E7023873T”,
:reference => “1234”,
:refund_type => :full,
:currency => “USD”
})
response = ppr.refund
raise response.errors.inspect if response.errors.present?
response
end

For profie id it gets the profile id from the table for each transaction. But incase of transaction id there are no transaction id in response while getting a payment to paypal.
I just hardcoded the transaction id from the last transaction from the website. But it showing error.

[{:code=>"10004", :messages=>["Transaction refused because of an invalid argument. See additional error messages for details.", "The transaction id is not valid"]}]

Thanks in advance
Debadatta