I prefer payments to be made via PayPal. You don't need a PayPal account in order to do this and it's a very easy way to pay; you'll simply be emailed a PayPal invoice which enables you to make a secure online payment using your credit or debit card.
The first time you use Cats' Cradle I'll send you an invoice prior to your departure, as this means you'll have an official record of my name and address should you need to inform your insurance company of any additional key holders. Subsequent invoices will be sent at the end of each month, unless requested otherwise.