1. Write script which will generate static XML file from Vendor product API, I need only all product data.
2. Script must be executed using PHP-CLI in browser window with start and stop generate button and maybe show some progress and finish information.
Here is vendor documentation (you will need org number, login and pass for gateway - will give you)
[login to view URL]
(will have more api's for you, if you will finish this successfuly)