Struct Dkb 

pub struct Dkb { /* private fields */ }

DKB (Deutsche Kreditbank) FinTS workflow.

DKB message flow per spec + empirical discovery:

  Sync dialog:
    Msg 1: HKIDN + HKVVB + HKSYN   → BPD, system_id
    Msg 2: HKEND

  Business dialog:
    Msg 1: HKIDN + HKVVB + HKTAN:4(ref=HKIDN)  → InitResult
      → TanRequired: push sent (3955)
      → Opened: SCA exemption (3076)
    Msg 2: HKTAN:S(task_ref)                     → PollResult
      → Confirmed: 0020
      → Pending: 3955/3956
    Msg 3: HKSAL [+ HKTAN:4(ref=HKSAL)]         → SendResult
      → Success: balance data (HISAL)
      → NeedTan: additional TAN for balance
    Msg 4: HKKAZ [+ HKTAN:4(ref=HKKAZ)]         → SendResult
      → Success: transaction data (HIKAZ)
      → Touchdown: more data, fetch again
    Msg 5: HKEND

Implementations

impl Dkb

pub fn new() -> Self

Trait Implementations

impl BankOps for Dkb

fn config(&self) -> &BankConfig

async fn initiate( &self, username: &UserId, pin: &Pin, product_id: &ProductId, system_id: Option<&SystemId>, _target_iban: Option<&Iban>, _target_bic: Option<&Bic>, ) -> Result<InitiateOutcome>

Phase 1: sync + init, return TAN challenge or authenticated dialog.

async fn fetch( &self, dialog: &mut Dialog<Open>, account: &Account, days: u32, ) -> Result<FetchResult>

Phase 2: fetch balance + transactions from an open dialog. Takes &Account — IBAN and BIC are guaranteed present.

async fn fetch_holdings( &self, dialog: &mut Dialog<Open>, account: &Account, ) -> Result<Vec<SecurityHolding>>

Fetch securities holdings from an open dialog. Takes &Account — IBAN and BIC are guaranteed present. Returns an empty Vec if the bank does not support depot queries.