Is there any api service on fastspring?

Dear author,

One of my client asking fastingspring payment gateway for woocommerce and i found you. but my client asking your plugin only ask company id to process the payment. Loadspring provide any API keys to integrate the payment? she feel api way is too secure compare to company id.

kindly clarify my doubts, because i am also newbie for fastspring

The page I need help with: [log in to see the link]