Perform[cb] does not allow billing or pricing models that are not transparent to users. This transparency must be present during the checkout process and clearly tell users how they'll be charged.

Requirements:

• Billing terms and conditions must be clear and conspicuous to users.
• Billing terms and conditions cannot be provided only via a link.
• Prices and billing methods must be easily located on your website and obvious to users.
• Must provide users the opportunity to affirmatively consent to recurrent billing or subscriptions. This can be done by allowing users to click a button which signifies their consent next to a clear and conspicuous disclosure of the price, billing interval, cancellation method and other material terms. This may also be done through the use of an opt-in box which users must check before submitting their information and which is positioned next to a hyperlink to the terms and conditions.  
• Providing prices and billing information in very small print is not considered clear and conspicuous to users.