first thanks for your astonishing work. Unfortunately I can't get the transactions from an Sparkasse (Hildesheim) account.
libfintx.Main.Assembly("libfintx", "0.1");
var sync = libfintx.Main.Synchronization(25950130, "https://banking-ni2.s-fints-pt-ni.de/fints30", 300, "XXXXXXXXX", "XXXXXX", false);
var balance = libfintx.Main.Balance("XXXXXXXXX", 25950130, "DE42259501300XXXXXXXXX", "NOLADE21HIK", "https://banking-ni2.s-fints-pt-ni.de/fints30", 300,"XXXXXXXXX", "XXXXXX", false);
var trans = libfintx.Main.Transactions("XXXXXXXXX", 25950130, "DE42259501300XXXXXXXXX", "NOLADE21HIK", "https://banking-ni2.s-fints-pt-ni.de/fints30", 300, "XXXXXXXXX", "XXXXXX", false);
Via debugger I grabbed the following bankCode. I think it's the response from the bank.
HNHBK:1:3+000000000535+300+975229635374=001912201161CN5T=+2+975229635374=001912201161CN5T=:2'HNVSK:998:3+PIN:1+998+1+2::?+PumhqCOdWEBAACsmx1zqukWrAQA+1:20180208:143703+2:2:13:@8@00000000:5:1+280:25950130:XXXXXXXXX:V:0:0+0'HNVSD:999:1+@283@HNSHK:2:4+PIN:2+910+1789155502842709+1+1+2::?+PumhqCOdWEBAACsmx1zqukWrAQA+1+1:20180208:143703+1:999:1+6:10:16+280:25950130:XXXXXXXXX:S:0:0'HIRMG:3:2+9050::Die Nachricht enth?lt Fehler.'HIRMS:4:2:3+9110:2,2:Ung?ltige Auftragsnachricht?: Unbekannter Aufbau.'HNSHA:5:2+1789155502842709''HNHBS:6:1+2'
[08.02.2018 14:37:04] Starting job HKKAZ: Request transactions
[08.02.2018 14:37:04] HNVSK:998:3+PIN:1+998+1+1::?+PumhqCOdWEBAACsmx1zqukWrAQA+1:20180208:143704+2:2:13:@8@00000000:5:1+280:25950130:XXXXXX:V:0:0+0'
[08.02.2018 14:37:04] HNSHK:2:4+PIN:2+XXXXXX+1789155502842709+1+1+1::?+PumhqCOdWEBAACsmx1zqukWrAQA+1+1:20180208:143704+1:999:1+6:10:16+280:25950130:XXXXXX:S:0:0'
[08.02.2018 14:37:04] HNSHA:4:2+1789155502842709++XXXXXX'
[08.02.2018 14:37:04] HNVSD:999:1+@209@HNSHK:2:4+PIN:2+XXXXXX+1789155502842709+1+1+1::?+PumhqCOdWEBAACsmx1zqukWrAQA+1+1:20180208:143704+1:999:1+6:10:16+280:25950130:XXXXXX:S:0:0'HKKAZ:3:4+XXXXXX::280:25950130+N'HNSHA:4:2+1789155502842709++XXXXXX''
[08.02.2018 14:37:04] HNHBK:1:3+000000000428+300+975229635374=001912201161CN5T=+2'
[08.02.2018 14:37:04] HNHBS:5:1+2'
[08.02.2018 14:37:04] Connect to FinTS Server
[08.02.2018 14:37:04] Url: https://banking-ni2.s-fints-pt-ni.de/fints30