title: Is it possible to add Product to Magento cart from another website without product being in magento store
body: <p>I just setup a magento store (1.8) and added some demo products, but now my company wants to use the payment gateway built into magento to process payments from another website.</p>
  
  <p>To explain better, my company runs a school and has a website with an application that generates bills for parents to pay. These bills vary depending on class of student and other factors. So Parent A may pay $200 while parent B pays $400.</p>
  
  <p>What we want to do is post the amounts to be paid from the other website to our magento store and add it to cart for payment using our payment processor so that the magento features can still be used to log all transactions.
  Since I am new to magento, I don't know if it is possible to do this and how if possible.</p>
  
  <p>We intend to get the other application to generate the SKU, Product ID and Description automatically and post it together with the amount to the store.</p>
  
  <p>So how do I get the magento store to receive this url and process it?</p>