Add authorize.net form to existing PHP site

I have an existing small PHP site, I need to add a single form to accept a user's name/address and credit cards through [login to view URL] and once the amount is authorized, send an email (order summary) to the customer, and to the admin of the site. This is for a single product only, the price will be hard coded in the PHP, and the user will only be allowed to update the quantity.