Paypal - charge customer an unknown amount at a later date

问题

We have a site where we need to charge the customer an upfront fee, and then when they complete a process at a later date, we will charge them another amount for which we only have an estimate.

What is the best way to do this with PHP SDK?

Do I need to use the Classic API? Is a regular Billing Agreement (subscription) required?

回答1:

Reference Transactions are not currently available in the Paypal PHP SDK, but they are working on it. You can do it with the Classic API.

来源：https://stackoverflow.com/questions/39665659/paypal-charge-customer-an-unknown-amount-at-a-later-date