Integrate Amazon FPS

We have an existing and fully functional drupal 6.x site complete with Ubercart modules and with the Amazon Store module. Both modules are populated with product and both work fine. Items can be “purchased” from either the Ubercart or the Amazon store without error. As it stands the Ubercart purchases will be payment-processed using paypal, [login to view URL], or google checkout. Amazon accounts are in place, and the Amazon items will be payment-processed using the Amazon checkout process. A buyer purchasing an item from the Ubercart modules and another from the Amazon items will have to checkout twice: once using Ubercart payment processing and once using Amazon processing. The project is to integrate the Ubercart checkout with the Amazon FPS payment processing system and to ensure that items from both the Ubercart modules and the Amazon Affiliate modules are added to the SAME CART while the SAME SESSION is active. In that manner, there will be a single checkout for all items whether purchased from the Ubercart selection or the Amazon selection, so long as checkout and payment is accomplished during the same session. The point of integration is at the “add to cart” button click in the ubercart module, after which no further ubercart processing required. This invalidates certain inventory quantity tracking and customer payment histories, which we understand and which is accepted. [login to view URL] is in the process of integrating the Amazon FPS with the Ubercart modules. We do not wish to wait for their completion of the module, and it may be that their module will not fully integrate on a site where both Ubercart items and Amazon affiliate items are sold. Understand that this project is to have a single checkout process using the Amazon FPS for ALL items. Please do not bid on this project unless you have the drupal 6.x, ubercart, and amazon api skills and experience to fully visualize how you will build the customization, and can accomplish the task within the time specified in your bid. We are savvy drupal site builders and operators of multiple websites. We can help where necessary with decisions and methods. We will escrow the full bid and expect the work to be done on our site on our verio server. We will provide full ftp and drupal admin access. No core modifications to drupal or to the ubercart and amazon store modules will be allowed. All customizations must be placed in custom folders as drupal allows. The work must unaffected by [login to view URL], version upgrades, and patches, except insofar as separate code modifications may be required.