I need a script to export sales from eBay and Amazon into Freeagent

I need a script that will:

* import all the transactions from my eBay seller account, such as listing fees, final value fees, payments against invoices, etc (this is not PayPal, but eBay directly)
* import all the transactions from my Amazon seller central account, such as the monthly service fee, shipping charges, sales, etc

I only really need the date and time of the transaction, the value and a summary of what it is, all that information is available from the eBay / Amazon APIs.

I need that information imported into Freeagent (online accounting software). Freeagent has a JSON REST API that you can send a CSV containing the transactions too easily enough.

I can increase the budget if the script is also able to create explanations for the transactions via the Freeagent API also. For example, if it can tell Freeagent that one transaction is a sale, and another transaction is a cost of sale charge (eg: final value fee on eBay).

I would like the script to run on Linux, via the command line so that I can schedule it to run daily via a cron job to import the transactions overnight.

I would prefer the script to be written in Python, or PHP.

Please contact me if you have any questions.