Get Etsy sales data and update stock levels via API (JSON) in PHP

I would like 2 php functions written to integrate with the [login to view URL] API (JSON) for an existing Etsy store. - First function will take 2 date variables (a to and from range) as and contact Etsy to obtain sales data for transactions from within this date range. It will parse the JSON data returned and then return this data as an array of SKU, transaction ID and quantity sold. - Second function will take an array of SKU's and inventory stock levels and update Etsy. It will return the outcome of the update and any fails. The functions must be written in PHP to integrate with existing scripts.