The shoes ?  Because you have G pay in the listing the money will go through "Managed Payments", have you completed the process of signing up and verifying your account ?

As eBay sees you as a "new seller" you funds will be held for 30 days or until you can show by feedback and/or tracking that the item has been delivered. That does not mean that you can hold the item until payment has cleared into your account. You MUST send the item as soon as eBay notifies you that the payment has been received by them.