MAGENTO/PHP Specialist

We are having two problems with a Custom magento ecommerce site: 1) Failed payments via PAYPAL EXPRESS CHECKOUT - We get the following message from magento: PayPal gateway has rejected request. Express Checkout token is missing (#10408: Express Checkout token is missing). Express Checkout PayerID is missing (#10419: Express Checkout PayerID is missing). The PayerID value is invalid (#10406: Transaction refused because of an invalid argument. See additional error messages for details). 2) Sales not registering in Magento - We are getting payments come through from PAYPAL where there is no record in Magento. The Payments also come through in the wrong currency (US $ instead of Au $) and postage rates are also wrong. These two bugs need fixing