413553 Oscommerce PayPal integration

Hi Have a online shop which has a paypal instant pay module, however there are some minor errors coming up, and some general fixes that are required to make the shop work perfectly. We would also like to possibly have people sign into the shop with their PayPal account info to save them signing up twice (if possible). Also have a problem because sometimes a sale goes through and it doesn't show up as cleared, but it is cleared .