Its paid in cash to the girl when you have your date. What the site recommends is that you pay (or collect) half of the money up front and the other half at the end of the date. If you have any issues with collection of money or payment, you can contact the site and let them know.

How do I delete whats your price?

Click on your user icon at the top right corner of the site and click on Settings. On the bottom of the page you will see the Revoke consent and Delete account link (Both will result in account deletion).