You're certainly welcome to purchase any of the white-label services on your own Workify storefront website.
One reason you might want to do this is to help market your Workify site. To purchase a service yourself, you will need to purchase directly from your Workify site. Make sure you're logged out of your Workify owner account when you make the purchase.
You'll then have two accounts:
- An owner account which you log into at workify.co
- A client account which you log into through your Workify storefront website to access your own purchases