什么是JSON支付paypal定义的简单，最小的例子？

I am looking for a simple JSON example of a paypal definition for a donation. This does not seem to be covered in PayPal docs. It needs a simple parameter for a specific date for the payment to be made, and a option for it to be recurring on this date annually. I have tried the following , but it does not allow for a payment date or recurring. What needs adding?I am looking for a simple JSON example of a pay