I could not find anything explaining how a PayPal subscription (or recurring payment) works when the payment is suspended and then reactivated.
Suppose I start through ExpressCheckout APIs a subscription: starts the 1st january and is 10 euros each month. Then I suspend the subscription the 15th of February (I got 10 euros for January and 10 euros for February).
Suppose I reactivate the subscription the 15th of May:
and above all: is it me or PP docs are confusing? (be sincere ;))
If the subscription is suspended then each billing date is "ignored" and deemed not to be collected. March and April's payment would not be collected.
Once reactivated we will billing the customer on their original billing date which is the 1st. So once activated on the 15th of May we'd still charge the customer on the 1st of June.
I hope this helps and let me know if you have any questions.