The receipt letter repeated what the receipt itself states. It now carries the
amount, the moment of payment with its offset, and the link — the receipt is
the document, and it opens without authentication, so there is nothing for the
two to disagree about. Subject reworded to name what it is.
The ledger and tax-export tables labelled the account link "card", meaning the
user card. On pages about payments that reads as a bank card, which is exactly
how it was misread. Both now show the first eight characters of the account id,
so the column carries data — two rows from the same buyer are visible at a
glance — while the link still holds the whole id.
The direct rail runs on НПД, where the provider neither files with the tax
service nor issues a receipt — so nobody was doing it. This registers each
rouble purchase, annuls its receipt on a refund, and hands the buyer the
receipt by email.
Two properties of the (unofficial) lknpd API shape the design. Registering an
income takes no idempotency key, so an error does not mean nothing happened:
the service name is frozen before the call and carries a marker from the tail
of the order id, and after a failure the taxpayer's income list is searched
for that exact name. Found means filed; not found halts the queue for a human,
because declaring an income twice is as wrong as not declaring it. And faults
are classified rather than logged: a token is renewed silently, a throttle
backs off, an outage retries, but three unfixable rejections take the rail out
of service — a changed format must not become thousands of requests overnight.
The console button and the worker share one RunBatch. Automatic mode is armed
from the console, not from configuration, so the operator can watch a run go
through by hand first. A daily watchdog runs whether or not it is armed, since
the case it exists for is the export being off. An idle queue issues no call at
all — not even an authentication.
No payment path changed: the purchase letter rides the existing payment-event
outbox on its own cursor, the receipt and annulment letters ride the export
row. Decisions D53-D60.
Ilia Denisov