I'm developing a module that handles IPN calls from Paypal. From the documentation, I see that when txn_type = 'recurring_payment_skipped' , the IPN will be retried up to 3 times, 5 days apart. But what about other transaction types, such as 'subscr_failed' and 'recurring_payment_failed' ? Do they enter the retry process as well or are they sent once only? Thanks!
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