I've made the change. Turned on logging in the module settings and placed an order through the web shop (successfully).
Afterwards I was able to find a few log files.
2 of them contain a reference to IPN. I have copied a few lines from ipn_1457695299_IV51.log.
Code:
Mar 11 2016 12:21 -- IPN INFO - POST VARS to be sent back for validation:
To: ssl://www.paypal.com:443
POST /cgi-bin/webscr HTTP/1.1
Host: www.paypal.com
Content-type: application/x-www-form-urlencoded
Content-length: 101
Connection: close
The second file also contains a few errors ipn_1457695301_EzA7.log
Code:
Mar 11 2016 12:21 -- IPN PROCESSING INITIATED.
*** Originating IP: 173.0.81.1 notify.paypal.com
*** Browser/User Agent: PayPal IPN ( https://www.paypal.com/ipn )
Mar 11 2016 12:21 -- IPN FATAL ERROR :: Could not find stored session in DB, cannot re-create session as PayPal IPN transaction.
Mar 11 2016 12:21 -- IPN FATAL ERROR :: No saved IPN session data available. Must be an Express Checkout or Direct Pay transaction.
Mar 11 2016 12:21 -- IPN INFO - POST VARS received (sorted):
Array
(
Code:
Mar 11 2016 12:21 -- IPN INFO - Confirmation/Validation response
SUCCESS
Mar 11 2016 12:21 -- Breakpoint: 1 - Collected data from PayPal notification
Mar 11 2016 12:21 -- IPN INFO :: Transaction email details.
Mar 11 2016 12:21 -- Breakpoint: 2 - Validated transaction components
Mar 11 2016 12:21 -- Breakpoint: 3 - Communication method verified
Mar 11 2016 12:21 -- Breakpoint: 4 - Details: txn_type=unknown ordersID = 0 IPN_id=0
Relevant data from POST:
txn_type = unknown
parent_txn_id = None
txn_id = xxxxxxxx (deleted by me)
Mar 11 2016 12:21 -- Breakpoint: 5 - Transaction type (txn_type) = unknown
Mar 11 2016 12:21 -- IPN WARNING :: Could not process for txn type: unknown
postdata=transaction_subject=
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