mikian/paypal-recurring — comment on commit 803ac0a31e6fda22942da1acfe8565e6a4816556
File:  line 0
By mikian:

Hi,

transaction_id exists in the paypal response only when an actual transaction has been made.
In my own project I get transaction_id after made payment request with request_payment method and use this id when getting IPN related to this transaction.