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I hold education classes, and so I want to set up a payment system where a certain amount of people have to sign up for a particular class to go on. Kind of similar to how funding goals must be met on Kickstarter and Indiegogo. If the number of people needed is not reached, the people who signed up for the class would not be charged.
The site is built on Wordpress.
I want to use Stripe.com for the payments.