.claude/CLAUDE.md

@@ -292,6 +292,10 @@ The native Android app is a Capacitor 8 wrapper of the `ui` SPA, scaffolded unde
     millisecond clock — the first eight are shared by every order in the same ~65 seconds, which
     would make two purchases indistinguishable to the probe. An unresolved outcome halts the
     whole queue on purpose; a blind retry is the one thing that must never happen.
+  - **The printable receipt link IS public** — `GET /api/v1/receipt/<ИНН>/<uuid>/print` opens with
+    no authentication (verified on prod 2026-07-28; online sources contradict each other on this,
+    so do not "fix" it back). It is the same URL the «Мой налог» app hands out under «копировать в
+    буфер», which is why the buyer's receipt letter can simply carry it.
   - **The receipt's time zone decides the tax month.** The ledger is UTC; `BACKEND_MYNALOG_TZ`
     (default `Europe/Moscow`) is what a payment is filed under, so a 23:30 UTC payment on the last
     of the month belongs to the *next* one.

backend/internal/adminconsole/render_test.go

@@ -54,10 +54,10 @@ func TestRendererRendersEveryPage(t *testing.T) {
 			SignedIn: true, INN: "770000000000", AutoEnabled: true, TimeZone: "Europe/Moscow",
 			LastOK:  "2026-07-28 12:00",
 			Backlog: MyNalogBacklogRow{Count: 2, Amount: "300.00 RUB", Oldest: "2026-06-30", Overdue: true},
-			Owed: []MyNalogRow{{LedgerID: "l1", AccountID: "a1", At: "2026-07-28 12:00",
+			Owed: []MyNalogRow{{LedgerID: "l1", AccountID: "a1", AccountShort: "a1", At: "2026-07-28 12:00",
 				Amount: "149.00 RUB", Name: `Внутриигровая валюта: "Фишка", 100 шт. (ID: 0198c1f2)`}},
-			Cancels: []MyNalogCancelRow{{LedgerID: "l2", AccountID: "a2", ReceiptUUID: "20abcdef01", Failed: true}},
-			Attention: []MyNalogRow{{LedgerID: "l3", AccountID: "a3", At: "2026-07-27 09:00",
+			Cancels: []MyNalogCancelRow{{LedgerID: "l2", AccountID: "a2", AccountShort: "a2", ReceiptUUID: "20abcdef01", Failed: true}},
+			Attention: []MyNalogRow{{LedgerID: "l3", AccountID: "a3", AccountShort: "a3", At: "2026-07-27 09:00",
 				Amount: "99.00 RUB", Name: "x (ID: 0198c1f3)", Attempts: 2, LastError: "timeout"}},
 		}, "Needs attention"},
 		{"mynalog", MyNalogView{SignedIn: true, TimeZone: "Europe/Moscow", Paused: true,

backend/internal/adminconsole/templates/pages/ledger.gohtml

@@ -40,7 +40,7 @@ Money in: {{range .Totals.MoneyIn}}<strong>{{.}}</strong> {{else}}<span class="n
 {{range .Rows}}
 <tr>
 <td>{{.At}}</td>
-<td><a href="/_gm/users/{{.AccountID}}">card</a></td>
+<td><a href="/_gm/users/{{.AccountID}}"><code>{{.AccountShort}}</code></a></td>
 <td>{{.Kind}}</td>
 <td>{{.Money}}</td>
 <td>{{.ChipsDelta}}</td>

backend/internal/adminconsole/templates/pages/mynalog.gohtml

@@ -79,7 +79,7 @@ created; entering a receipt number means you filed it by hand.</p>
 <tbody>
 {{range .Cancels}}
 <tr>
-<td><a href="/_gm/users/{{.AccountID}}">card</a></td>
+<td><a href="/_gm/users/{{.AccountID}}"><code>{{.AccountShort}}</code></a></td>
 <td><code>{{.ReceiptUUID}}</code></td>
 <td>{{if .Failed}}<span class="note">a previous attempt was refused</span>{{else}}awaiting{{end}}</td>
 </tr>
@@ -96,7 +96,7 @@ created; entering a receipt number means you filed it by hand.</p>
 {{range .Owed}}
 <tr>
 <td>{{.At}}</td>
-<td><a href="/_gm/users/{{.AccountID}}">card</a></td>
+<td><a href="/_gm/users/{{.AccountID}}"><code>{{.AccountShort}}</code></a></td>
 <td class="num">{{.Amount}}</td>
 <td><code>{{.Name}}</code></td>
 <td class="num">{{.Attempts}}</td>

backend/internal/adminconsole/views.go

@@ -786,7 +786,10 @@ type LedgerView struct {
 // still reverse, which is what puts the Refund button on that row.
 type LedgerRow struct {
 	At string
+	// AccountID is the link target; AccountShort is what the cell shows, because a ledger row has
+	// no room for a full uuid and the operator mostly needs to spot two rows from the same buyer.
 	AccountID    string
+	AccountShort string
 	Kind         string
 	Source       string
 	Origin       string
@@ -843,6 +846,7 @@ type MyNalogBacklogRow struct {
 type MyNalogRow struct {
 	LedgerID     string
 	AccountID    string
+	AccountShort string
 	At           string
 	Amount       string
 	Name         string
@@ -858,6 +862,7 @@ type MyNalogRow struct {
 type MyNalogCancelRow struct {
 	LedgerID     string
 	AccountID    string
+	AccountShort string
 	ReceiptUUID  string
 	Failed       bool
 }

backend/internal/inttest/mynalog_test.go

@@ -675,8 +675,22 @@ func TestMyNalogBuyerMails(t *testing.T) {
 	if got := len(box.to(addr)); got != 2 {
 		t.Fatalf("letters after filing = %d, want 2", got)
 	}
-	if !strings.Contains(box.to(addr)[1].Text, "/api/v1/receipt/770000000000/") {
-		t.Errorf("the receipt letter carries no receipt link:\n%s", box.to(addr)[1].Text)
+	receipt := box.to(addr)[1]
+	if receipt.Subject != "Эрудит — Ваш чек покупки" {
+		t.Errorf("receipt letter subject = %q", receipt.Subject)
+	}
+	if !strings.Contains(receipt.Text, "/api/v1/receipt/770000000000/") {
+		t.Errorf("the receipt letter carries no receipt link:\n%s", receipt.Text)
+	}
+	// The amount carries its time-zone offset, because that offset is what decides the tax period
+	// the receipt belongs to and the buyer should see the same moment the receipt states.
+	if !strings.Contains(receipt.Text, "Покупка на сумму: 149.00 ₽ от ") ||
+		!strings.Contains(receipt.Text, "+03:00") {
+		t.Errorf("the receipt letter's amount line is wrong:\n%s", receipt.Text)
+	}
+	// Nothing beyond the amount, the moment and the link: the receipt is the document.
+	if strings.Contains(receipt.Text, "test pack") {
+		t.Errorf("the receipt letter repeats the catalog title; the receipt itself carries it:\n%s", receipt.Text)
 	}
 
 	// 3. The annulment letter after a refund.

backend/internal/mynalogsync/mailer.go

@@ -164,7 +164,7 @@ func (m *Mailer) sendReceiptMails(ctx context.Context, cancelled bool) {
 			m.stampReceipt(ctx, mark, r.LedgerID)
 			continue
 		}
-		subject, body := "Эрудит — чек от налоговой", receiptText(r, stored.INN, m.baseURL, m.loc)
+		subject, body := "Эрудит — Ваш чек покупки", receiptText(r, stored.INN, m.baseURL, m.loc)
 		if cancelled {
 			subject, body = "Эрудит — чек аннулирован", cancelText(r, m.loc)
 		}
@@ -232,19 +232,19 @@ func purchaseText(p payments.PurchaseMail) string {
 
 // receiptText is the fiscal receipt letter, which is how the receipt is actually handed to the
 // buyer as the professional-income tax regime requires.
+//
+// It is deliberately bare: the amount, the moment of payment with its offset, and the link. The
+// receipt itself is the document and it opens without authentication, so repeating its contents
+// here would only add something for the two to disagree about.
 func receiptText(r payments.ReceiptMail, inn, baseURL string, loc *time.Location) string {
 	return fmt.Sprintf(`Здравствуйте!
 
-По вашей покупке сформирован чек в налоговой службе.
+Покупка на сумму: %s от %s
+Ссылка на чек: %s
 
-%s
-Дата: %s
-Чек: %s
-
-Продавец применяет налог на профессиональный доход; чек сформирован в сервисе
-«Мой налог» Федеральной налоговой службы.
-`, describe(r.Title, r.AmountMinor, r.Currency),
-		r.OperationTime.In(loc).Format("02.01.2006 15:04"),
+Спасибо, что играете в «Эрудит».
+`, formatAmount(r.AmountMinor, r.Currency),
+		r.OperationTime.In(loc).Format("02.01.2006 15:04 -07:00"),
 		mynalog.ReceiptURL(baseURL, inn, r.ReceiptUUID))
 }
 

backend/internal/server/handlers_admin_console.go

@@ -1375,6 +1375,17 @@ func normalizeComplaintStatus(s string) string {
 	return ""
 }
 
+// shortID abbreviates an account id for a table cell: enough to recognise the same buyer across
+// rows at a glance, while the link still carries the whole id. Money tables have no room for a full
+// uuid, and a generic label there ("card") read as a payment card on the very pages about payments.
+func shortID(id string) string {
+	const n = 8
+	if len(id) <= n {
+		return id
+	}
+	return id[:n]
+}
+
 // fmtTime formats a timestamp for display, or "" when zero.
 func fmtTime(t time.Time) string {
 	if t.IsZero() {

backend/internal/server/handlers_admin_ledger.go

@@ -132,6 +132,7 @@ func ledgerRow(r payments.LedgerReportRow) adminconsole.LedgerRow {
 	row := adminconsole.LedgerRow{
 		At:           fmtTime(r.CreatedAt),
 		AccountID:    r.AccountID.String(),
+		AccountShort: shortID(r.AccountID.String()),
 		Kind:         r.Kind,
 		Source:       r.Source,
 		Origin:       r.Origin,

backend/internal/server/handlers_admin_mynalog.go

@@ -61,6 +61,7 @@ func (s *Server) consoleMyNalog(c *gin.Context) {
 		view.Cancels = append(view.Cancels, adminconsole.MyNalogCancelRow{
 			LedgerID:     cn.LedgerID.String(),
 			AccountID:    cn.AccountID.String(),
+			AccountShort: shortID(cn.AccountID.String()),
 			ReceiptUUID:  cn.ReceiptUUID,
 			Failed:       cn.CancelStatus == payments.MyNalogCancelFailed,
 		})
@@ -99,6 +100,7 @@ func (s *Server) myNalogRow(in payments.MyNalogIncome, inn string, loc *time.Loc
 	row := adminconsole.MyNalogRow{
 		LedgerID:     in.LedgerID.String(),
 		AccountID:    in.AccountID.String(),
+		AccountShort: shortID(in.AccountID.String()),
 		At:           in.OperationTime.In(loc).Format("2006-01-02 15:04"),
 		Amount:       in.Amount.String(),
 		Name:         s.mynalog.ReceiptName(in),