Found when trying to test the adyen pending transaction resolver T321602: Adyen pending resolver - handle no gateway_txn_id and when its equal to the string false
{"gateway_txn_id":false,"response":false,"gateway_account":"WikimediaDonations","fee":0,"contribution_tracking_id":"133452400","utm_source":"2.7.cc.default~default~default~default~control.cc","utm_medium":"WikipediaApp","utm_campaign":"Android"...
Preliminary research:
MariaDB [smashpig]> select count(id) from pending WHERE gateway='adyen' AND gateway_txn_id='';
| count(id) |
| 534 |
So there are a bunch of these
Checking the last few made in Adyen looks like some aren't in Adyen at all, some are Refused and at least one was Retried and sitting at Authorised
137966477.1 Not in Adyen
137949583.1 Refused
137947555.1 Refused
137945018.1 Not in Adyen
137911822.1 Refused
137870362.1 Retried then sitting at Authorised