What are the possible responses for "payment_error"?

[brianoflondon]

Ask: what are the possible return results for payment_error that I need to code against?

I have a curious transaction which returned the following to me following a call to the API endpoint v1/channels/transactions

This is a log from my app and the line Status: 200 after time: 0.701 is remarkably quick: normally I see times of 2 or 3s at least and up to a couple of minutes. I believe I currently time out at 420s.

2022-03-25 19:56:23,521 INFO      lnd_local_pay    562 : Starting to pay invoice lnbc135240n1p3r6g5npp59ymv9jqls7ykw6hvmc0pxmx2chljxsplsv59s5yf22383km8737qdqqcqzzgxqyz5vqrzjqw8c7yfutqqy3kz8662fxutjvef7q2ujsxtt45csu0k688lkzu3ld5vn99lhjy8v8sqqqqryqqqqthqqpysp5pstenszmx4fhp6j6vvvhhdy63hk89jwc5uf0ql4v5hwvjhae84ns9qypqsqc3nzjql6gtfn8kzz9rqx09263p5tggpdut57gvvxexuyf98w8e5ksj3qt0w023fpkvhk5g45sdpgzlsvglhm2pmpkc4hgkljgt9h69sqxjk5ec | Timeout set: 480
2022-03-25 19:56:24,222 INFO      lnd_local_pay    569 : Status: 200 after time: 0.701
2022-03-25 19:56:24,225 INFO      lnd_local_pay    571 : LND result: {
  "payment_error": "payment is in transition",
  "payment_preimage": "",
  "payment_route": null,
  "payment_hash": "KTbCyB+HiWdq7N4eE2zKxf8jQD+DKFhQiVKieNtn9Hw="
}

My code had never seen that before and I went ahead and acted on it as if it was a failure.

Subsequently, more than 2 hours later, it seems a payment did succeed.

I've got the full output of the Invoice and I'm not sure if posting it here is a problem in what it reveals but if I'm told it is fine to do I will post it here.

This section of the second payment attempt is what has me genuinely confused:

            },
            "attempt_time_ns": "1648237458419732384",
            "resolve_time_ns": "1648246107396001336",
            "failure": null,
            "preimage": "wZ43hhvlXWXHjcDj1HJ6s3nXqdtMpf7NxX3U3HO2vP4="
        }

Calculating those times gives the following:
Attempt: GMT: Friday, 25 March 2022 19:44:18.397
Resolve: GMT: Friday, 25 March 2022 22:08:27.396

I had no idea this was possible.

I believe the transaction was a payment to a wallet within Magnetron and I've had all sorts of issues with them. The penultimate hop was:

https://amboss.space/node/038f8f113c580048d847d6949371726653e02b928196bad310e3eda39ff61723f6

And the last hop is a private node.

So my final question remains, what are all the possible results I have to code against when paying an invoice?