If all of this just needs to be posted in your thank-you pages, and you're using your standard E-junkie-generated thank-you pages (rather than redirecting to a thank-you page URL on your site), you could insert most of the required order details by using our template tags documented here:
The section for general order and merchant information would go in your Common Thank-you Page HTML field (Seller Admin > Account Preferences), and the section for item specific information would go in each product's Message (HTML) field. You would place the template tag where its information should be inserted, like so:
E.g., our 'txn_id' for Google Wallet/Checkout adds a prefix "gc-" to the standard Google checkout Order Number, so if they require the original Order Number in the line:
All that said, what happens if the buyer never clicks past the end of checkout to view their thank-you page at all? PayPal and Google Wallet/Checkout do not auto-redirect the buyer to any thank-you page after checkout, so if the buyer has no reason to do so (such as claiming a download), they might never trigger any tracking code placed in that page.
All that said, it seems like the requirements you posted above might be intended for use with a "licensed", full-featured ecommerce software package that gets installed on your server, which controls every step of the shopping and checkout experience as a self-contained solution operating entirely on your own server. E-junkie is a "hosted" service where we manage the shopping cart software for you on our own servers, and we hand-off checkouts entirely to a third-party payment processor such as PayPal or Google Wallet/Checkout, so we don't provide the degree of complete control that this Trusted Stores implementation might require.