App setup/installed to gather datafeed for google/amazon

I am not sure if I put this in the right area, but I am wanting to have our website setup with an app that will automatically or manually save and update a data feed for Google/Amazon/Etc. We are wanting to promote our products on Google/Yahoo/Amazon and would like for the data feed to either manually or automatically save itself to a file. This file can either update daily or it can allow me to update it. Please let me know what options we have for this, as I am looking for a more permanent solution rather than a short term goal. Here is some info from Google Feed Specification for Merchants: Feed Specification Share Comment Print In order to prevent suspension of your feed please read the Product Search policies very carefully before creating a feed. This page lists all the attributes which are available to describe your products. You can use these attributes to upload your product data in data feeds (text/tab delimited or XML format) or API. Important Note: * If you are using a delimited format, you can use the attribute names in either English or the language of your target country. * If you are using XML or API, you must use English attribute names shown within the brackets. * If you are using XML or API, you must use an underscore in place for a space within an attribute name (e.g., "image_link" instead of "image link".) A space within an attribute value is allowed (e.g., "in stock".) Required These attributes must be included in any data feed and any items missing these attributes will not be processed. For more detailed instructions for each attribute click on them. id [id] A unique alphanumeric identifier for each item- e.g. your internal ID code. IMPORTANT: * Once an item is submitted the unique id cannot change when you update your data feed. * Item identifiers must be unique within your account. If you have multiple feeds, items within different feeds must still have a unique identifier. Type Alphanumeric characters Text/Tab delimited tddy123uk XML <g:id>tddy123uk</g:id> title [title] The name of the item should be placed here and as described in our editorial guidelines please don't include any promotional text. In addition, all symbols should adhere to their true meaning, for example, do not use the @ symbol to replace the letter "a". Type Text, that should be not longer than 70 characters Text/Tab delimited Yellow Teddy Bear XML <title>Yellow Teddy Bear</title> link [link] This attribute is a direct link to your product URL. As our policies state as a merchant using Google Product Search it is your responsibility to maintain the website associated with your account at all times. All your URLs must link directly to webpages about your products without pop ups or redirects to other pages. This includes landing pages requiring sign ups, passwords, or direct links to files/email addresses. Links should not contain raw ip addresses. Type URL. (this must include the http:// portion) Text/Tab delimited [login to view URL] XML <link>[login to view URL];id=1030</link> price [price] Only items with fixed prices are allowed in Product Search; items with variable prices such as plane tickets or auctions are not valid. For items sold in bulk quantities the price for the lowest purchasable number of items must be defined in this attribute (not the per unit price) as described in our policies. All submitted prices must be in the correct must exactly match the price displayed on your website. If you do not provide a currency with the price (e.g. 15.00 USD), we will assume the currency is the same as that of your target country. Type Number Text/Tab delimited 15.00 USD XML <g:price>15.00 USD</g:price> description [description] This text describes each item. As laid out in our policies you may not use promotion