Paypal - charge customer an unknown amount at a la

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.