Wire zappier-edge into the live stack and add billing department APIs

Fleet now spawns the real zappier and middleware processes. Metered
timestamp/receipt/hash calls proxy to middleware when ZAPPIER_UPSTREAM
is set. CS credits, sales per-customer pricing, and QuickBooks export
are separate repos plugged into zappier-edge admin.

packages/zappier/src/admin.ts

@@ -10,6 +10,8 @@ import { PriceRule, PricingStore, TierConfig } from './pricing';
 import { PROJECT_ROOT } from './paths';
 import { billingRows, toCsv, usageTrend } from './reports';
 import { UsageRepo } from './usage';
+import { CreditLedger } from './credits';
+import { invoicesToAccountingCsv, invoicesToQuickBooksIif } from './accounting-export';
 
 // Issued login tokens (in-memory; a restart simply requires logging in again).
 const sessions = new Map<string, number>();
@@ -139,6 +141,7 @@ export function adminRouter(
   store: PricingStore,
   customers: CustomerRepo,
   accounting: AccountingDeps,
+  credits: CreditLedger = new CreditLedger(),
 ): Router {
   const router = Router();
 
@@ -222,6 +225,70 @@ export function adminRouter(
     res.json({ ok: true });
   });
 
+  /* ---------------- customer service: credits ---------------- */
+
+  router.post('/credits', (req, res) => {
+    const { customerId, cents, reason, agent } = req.body ?? {};
+    if (typeof customerId !== 'string' || !Number.isFinite(Number(cents))) {
+      res.status(400).json({ error: 'customerId and cents required' });
+      return;
+    }
+    const customer = customers.list().find((c) => c.id === customerId);
+    if (!customer) {
+      res.status(404).json({ error: 'customer not found' });
+      return;
+    }
+    const delta = Math.trunc(Number(cents));
+    const rec = credits.add({
+      customerId,
+      cents: delta,
+      reason: typeof reason === 'string' ? reason : 'credit adjustment',
+      agent: typeof agent === 'string' ? agent : 'admin',
+    });
+    customers.save({ ...customer, balanceCents: (customer.balanceCents ?? 0) + delta });
+    res.status(201).json(rec);
+  });
+
+  router.get('/credits', (req, res) => {
+    const customerId = typeof req.query.customerId === 'string' ? req.query.customerId : undefined;
+    res.json({ credits: credits.list(customerId) });
+  });
+
+  router.get('/sales/quote/:id', (req, res) => {
+    const customer = customers.list().find((c) => c.id === req.params.id);
+    if (!customer) {
+      res.status(404).json({ error: 'customer not found' });
+      return;
+    }
+    const tier = store.getTiers().find((t) => t.id === customer.tierId);
+    res.json({
+      customerId: customer.id,
+      name: customer.name,
+      tierId: customer.tierId,
+      multiplierOverride: customer.multiplierOverride ?? null,
+      monthlyCreditCents: tier?.monthlyCreditCents ?? 0,
+      listMultiplier: tier?.multiplier ?? 1,
+    });
+  });
+
+  router.get('/exports/quickbooks.iif', (req, res) => {
+    const period = typeof req.query.period === 'string' ? req.query.period : undefined;
+    const invoices = accounting.invoices.list({ ...(period ? { period } : {}) });
+    res
+      .type('text/plain')
+      .set('content-disposition', 'attachment; filename="zappier-quickbooks.iif"')
+      .send(invoicesToQuickBooksIif(invoices));
+  });
+
+  router.get('/exports/accounting.csv', (req, res) => {
+    const period = typeof req.query.period === 'string' ? req.query.period : undefined;
+    const invoices = accounting.invoices.list({ ...(period ? { period } : {}) });
+    res
+      .type('text/csv')
+      .set('content-disposition', 'attachment; filename="zappier-accounting.csv"')
+      .send(invoicesToAccountingCsv(invoices));
+  });
+
   /* ---------------- accounting: invoices ---------------- */
 
   router.post('/invoices/generate', (req, res) => {