Are there hooks for when stock is sold, or when the stock quantity of a product is updated? I want to use SimplePOS as a module of an existing PHP-based stock system and update quantities in the main stock system as sales happen.

I would also like to be able to send all sales information (quantity, unit price, line item total, tax etc.) to my stock system for accounting purposes.

Are there hooks for the two above situations, or will I need to code my own solution that talks directly to the MySQL database?

Thanks!!