Script I use to send n26 transactions to YNAB. Not documented as it's not really intended to be used by anyone but me but good luck.

n26_ynab.py

import requests
from n26.api import Api as N26Api
from datetime import datetime, timedelta
from pprint import pprint

ENABLE_YNAB = True

YNAB_TOKEN = '...'
BUDGET_ID = '...'
ACCOUNT_ID = '...'
IMPORT_ID_FMT = 'dx-n26:{unix_ts}:{amount}'
DAYS_BACK = timedelta(days=7)

YNAB_BASE = 'https://api.youneedabudget.com/v1'
YNAB_TRANS_URL = f'{YNAB_BASE}/budgets/{BUDGET_ID}/transactions'


def process_n26_transaction_for_ynab(tran):
    pending = (tran['type'] == 'AA' or tran['pending'])
    unix_ts = int(tran['visibleTS'] / 1000)
    amount = int(tran['amount'] * 1000)
    import_id = IMPORT_ID_FMT.format(unix_ts=unix_ts, amount=amount)
    date = datetime.fromtimestamp(unix_ts).date().isoformat()

    return {
        'account_id': ACCOUNT_ID,
        'date': date,
        'payee_name': tran.get('merchantName', tran.get('partnerName', '?')),
        'memo': tran.get('referenceText', ''),
        'amount': amount,
        'cleared': 'uncleared' if pending else 'cleared',
        'import_id': import_id,
    }

def send_transactions_to_ynab(trans):
    response = requests.post(
        YNAB_TRANS_URL,
        json={'transactions': trans},
        headers={'Authorization': 'Bearer ' + YNAB_TOKEN},
    )
    return response.json()

def main():
    now = datetime.utcnow()
    interval = [
        int(dt.timestamp() * 1000)
        for dt in [now - DAYS_BACK, now]
    ]

    trans = N26Api().get_transactions(*interval, limit=1000)

    trans = [process_n26_transaction_for_ynab(tran) for tran in trans]

    if ENABLE_YNAB:
        pprint(send_transactions_to_ynab(trans))
    else:
        pprint(trans)
        print(len(trans))


if __name__ == '__main__':
    main()