Interspire Cart (multi-vendor) Modifications

Hi, I will summarize the details about the tasks for better understanding. We are using Interspire Shopping Cart 5.5.4 Virtual Mall edition. You must have previous experience working with Interspire, so please do not bid if you are not sure what you are getting into. This is first of many work orders, so hopefully we can build a long working relationship. We would like work to be done on a work copy on our server, when its complete the changes will be applied to production website. 1) Allow Purchasing option for vendor level: This is currently a global setting, we would like this to be adjustable at the vendor level (controlled by site admins only). This either enables or disables shopping cart function on the whole website, we like to have control over individual vendors. in the vendor profile settings, under "Vendor Permissions" , add a checkbox for "Allow Purchasing" (example can be given privately) 2) Separate checkout/payment for each Vendor: We would like each vendor to handle their transactions directly with the customers... so we need to give each vendor the ability to configure their own checkout payment [login to view URL] a customer checkout, if he is buying from more than one vendor.. group checkout items by each vendor (please see attached pic ). In the vendor profile settings, under "Vendor Permissions" , add a checkbox for "Vendor Checkout" .. add an additional tab for the checkout/payment gateway settings. If the "vendor checkout" checkbox is not enabled, leave the transactions run its normal way (script default). Again we are only looking for programmers that has some experience with Interspire products, we are not looking for someone to do trial and error. Our budget is $200 ($100 for each task). There are more tasks after, will discuss after this is completed. Bid away, thank you!