feat(clientes): alta de cliente in one screen, opening balance as a payment

The 2026-10-08 ask: open an account without four screens — cliente,
propiedad, servicios and the saldo inicial, taken as the first payment.

POST /customers/onboard writes it all in one Prisma transaction; a bad
service or a taken folder number leaves nothing behind (rolled back on dev).
A cash opening balance goes through the EFE receipt book inside that same
transaction, so it gets its folio and its C<folio> credit; a check posts a
CHECK DEPOSIT against the number given. /clientes/alta pre-fills the next
free folder number and links the receipt for printing. The old
customer-only form stays as "Solo cliente".

Built without the screen sketch from the meeting (it never arrived); the
fields are the legacy ones.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/api/src/customers/customer-folder.spec.ts

@@ -20,7 +20,7 @@ function build(opts: { holder?: { name: string } | null; archived?: boolean; fol
       update: jest.fn().mockImplementation(({ data }) => Promise.resolve(data)),
     },
   };
-  return { service: new CustomersService(prisma as never), prisma };
+  return { service: new CustomersService(prisma as never, {} as never), prisma };
 }
 
 describe("customer folder numbers", () => {

apps/api/src/customers/customer-ledger-card.spec.ts

@@ -26,7 +26,7 @@ describe("customer file ledger card", () => {
       },
     };
     return {
-      service: new CustomersService(prisma as never),
+      service: new CustomersService(prisma as never, {} as never),
       prisma,
       groupBy,
     };

apps/api/src/customers/customer-onboard.spec.ts

@@ -0,0 +1,68 @@
+import { BadRequestException } from "@nestjs/common";
+import { CustomersService } from "./customers.service";
+
+/**
+ * Onboarding writes four tables in one transaction; what is checked here is
+ * that a request it can't complete is refused before anything is written, and
+ * that a cash opening balance goes through the receipt book inside that same
+ * transaction. The rollback itself was exercised against the dev database.
+ */
+
+function build() {
+  const tx = {
+    customer: { create: jest.fn().mockResolvedValue({ id: "c1" }) },
+    property: { create: jest.fn().mockResolvedValue({ id: "p1" }) },
+    propertyService: { createMany: jest.fn() },
+    typeTransaction: { findFirst: jest.fn() },
+    transaction: { create: jest.fn() },
+  };
+  const prisma = {
+    customer: { findFirst: jest.fn().mockResolvedValue(null) },
+    $transaction: jest.fn((fn) => fn(tx)),
+  };
+  const cash = { create: jest.fn().mockResolvedValue({ folio: 13935 }) };
+  return { service: new CustomersService(prisma as never, cash as never), prisma, tx, cash };
+}
+
+const pay = { amount: 500, currency: "MXN" as const, receivedAt: "2026-10-12" };
+
+describe("customer onboarding", () => {
+  it("refuses a check opening balance with no check number, writing nothing", async () => {
+    const { service, prisma } = build();
+    await expect(
+      service.onboard({ customer: { name: "X" }, openingPayment: { ...pay, method: "CHECK" } }, "u1"),
+    ).rejects.toBeInstanceOf(BadRequestException);
+    expect(prisma.$transaction).not.toHaveBeenCalled();
+  });
+
+  it("refuses services with no property to hang them on", async () => {
+    const { service, prisma } = build();
+    await expect(
+      service.onboard({ customer: { name: "X" }, services: [{ kind: "WATER" }] }, "u1"),
+    ).rejects.toBeInstanceOf(BadRequestException);
+    expect(prisma.$transaction).not.toHaveBeenCalled();
+  });
+
+  it("issues the cash receipt inside the onboarding transaction", async () => {
+    const { service, tx, cash } = build();
+    const r = await service.onboard(
+      {
+        customer: { name: "X" },
+        property: { addressLine1: "Calle 1" },
+        services: [{ kind: "WATER", accountNumber: "3014057" }],
+        openingPayment: { ...pay, method: "CASH" },
+      },
+      "u1",
+    );
+
+    expect(cash.create).toHaveBeenCalledWith(
+      expect.objectContaining({ customerId: "c1", amount: 500, concept: "SALDO INICIAL" }),
+      "u1",
+      tx,
+    );
+    expect(tx.propertyService.createMany).toHaveBeenCalledWith({
+      data: [{ kind: "WATER", accountNumber: "3014057", propertyId: "p1" }],
+    });
+    expect(r.receipt).toEqual({ folio: 13935 });
+  });
+});

apps/api/src/customers/customers.controller.ts

@@ -19,6 +19,7 @@ import { CustomersService } from "./customers.service";
 import { NumidService } from "./numid.service";
 import { CreateCustomerDto } from "./create-customer.dto";
 import { UpdateCustomerDto } from "./update-customer.dto";
+import { OnboardCustomerDto } from "./onboard-customer.dto";
 
 @UseGuards(AuthenticatedGuard, AbilityGuard)
 @Controller("customers")
@@ -83,6 +84,26 @@ export class CustomersController {
     return c;
   }
 
+  /**
+   * Alta en una pantalla. Gated on customer:create; the property, service and
+   * ledger abilities it also exercises sit at the same STAFF tier.
+   */
+  @Post("onboard")
+  @RequireAbility("customer:create")
+  async onboard(@Body() dto: OnboardCustomerDto, @Req() req: Request) {
+    const r = await this.customers.onboard(dto, this.actingId(req));
+    void this.audit.log(this.actingId(req), "customer.onboard", {
+      customerId: r.customer.id,
+      name: r.customer.name,
+      folderNumber: r.customer.folderNumber,
+      propertyId: r.property?.id,
+      services: dto.services?.length ?? 0,
+      folio: r.receipt?.folio,
+      openingTransactionId: r.receipt?.transactionId ?? r.payment?.id,
+    });
+    return r;
+  }
+
   @Patch(":id")
   @RequireAbility("customer:update")
   async update(

apps/api/src/customers/customers.module.ts

@@ -1,11 +1,12 @@
 import { Module } from "@nestjs/common";
 import { SettingsModule } from "../settings/settings.module";
+import { CashReceiptsModule } from "../cash-receipts/cash-receipts.module";
 import { CustomersController } from "./customers.controller";
 import { CustomersService } from "./customers.service";
 import { NumidService } from "./numid.service";
 
 @Module({
-  imports: [SettingsModule],
+  imports: [SettingsModule, CashReceiptsModule],
   controllers: [CustomersController],
   providers: [CustomersService, NumidService],
   exports: [NumidService],

apps/api/src/customers/customers.service.ts

@@ -1,8 +1,15 @@
-import { ConflictException, Injectable, NotFoundException } from "@nestjs/common";
+import {
+  BadRequestException,
+  ConflictException,
+  Injectable,
+  NotFoundException,
+} from "@nestjs/common";
 import { Prisma } from "@jorgecuadros/database";
 import { PrismaService } from "../prisma/prisma.service";
 import { CreateCustomerDto } from "./create-customer.dto";
 import { UpdateCustomerDto } from "./update-customer.dto";
+import type { OnboardCustomerDto } from "./onboard-customer.dto";
+import { CashReceiptsService } from "../cash-receipts/cash-receipts.service";
 import {
   BALANCE_FORWARD_TYPE,
   notCashJournal,
@@ -51,7 +58,10 @@ function toDate(v?: string): Date | null | undefined {
 
 @Injectable()
 export class CustomersService {
-  constructor(private readonly prisma: PrismaService) {}
+  constructor(
+    private readonly prisma: PrismaService,
+    private readonly cashReceipts: CashReceiptsService,
+  ) {}
 
   /** Unified customer list with search + business-line filter, paginated. */
   async list({ query, page, pageSize, line, includeArchived }: ListParams) {
@@ -259,6 +269,81 @@ export class CustomersService {
     });
   }
 
+  /**
+   * Open an account from one screen: customer, property, services and the
+   * opening balance taken as the first payment. One database transaction — a
+   * half-created account (a customer with no property, a payment with no
+   * customer) is worse than none, because the office would key it again.
+   */
+  async onboard(dto: OnboardCustomerDto, userId: string) {
+    const pay = dto.openingPayment;
+    if (pay) {
+      if (!(pay.amount > 0)) throw new BadRequestException("El saldo inicial debe ser mayor a cero.");
+      if (pay.method === "CHECK" && !pay.checkNumber?.trim()) {
+        throw new BadRequestException("Falta el número de cheque del saldo inicial.");
+      }
+    }
+    if (dto.services?.length && !dto.property) {
+      throw new BadRequestException("Los servicios necesitan una propiedad.");
+    }
+    await this.assertFolderFree(dto.customer.folderNumber);
+
+    return this.prisma.$transaction(async (tx) => {
+      const customer = await tx.customer.create({
+        data: { ...this.toData(dto.customer), name: dto.customer.name, nameMissing: false },
+      });
+
+      const property = dto.property
+        ? await tx.property.create({ data: { ...dto.property, customerId: customer.id } })
+        : null;
+      if (property && dto.services?.length) {
+        await tx.propertyService.createMany({
+          data: dto.services.map((s) => ({ ...s, propertyId: property.id })),
+        });
+      }
+
+      const concept = pay?.concept?.trim() || "SALDO INICIAL";
+      let receipt = null;
+      let payment = null;
+      if (pay?.method === "CASH") {
+        receipt = await this.cashReceipts.create(
+          {
+            customerId: customer.id,
+            receivedAt: pay.receivedAt,
+            amount: pay.amount,
+            currency: pay.currency,
+            exchangeRate: pay.exchangeRate,
+            concept,
+          },
+          userId,
+          tx,
+        );
+      } else if (pay?.method === "CHECK") {
+        const date = new Date(pay.receivedAt);
+        if (isNaN(date.getTime())) throw new BadRequestException("Fecha del saldo inicial inválida.");
+        const type = await tx.typeTransaction.findFirst({
+          where: { nameEn: "CHECK DEPOSIT" },
+          select: { id: true },
+        });
+        payment = await tx.transaction.create({
+          data: {
+            customerId: customer.id,
+            domain: "UTILITY",
+            typeId: type?.id,
+            transactionDate: date,
+            amount: new Prisma.Decimal(pay.amount.toFixed(2)),
+            currency: pay.currency,
+            checkNumber: pay.checkNumber!.trim(),
+            message: concept,
+            captureSource: "MANUAL",
+          },
+        });
+      }
+
+      return { customer, property, receipt, payment };
+    });
+  }
+
   async update(id: string, dto: UpdateCustomerDto) {
     const current = await this.ensureExists(id);
     // An archived customer's number is history, not a claim on the shelf.

apps/api/src/customers/onboard-customer.dto.ts

@@ -0,0 +1,56 @@
+import {
+  ArrayMaxSize,
+  IsArray,
+  IsEnum,
+  IsIn,
+  IsNumber,
+  IsOptional,
+  IsString,
+  MinLength,
+  ValidateNested,
+} from "class-validator";
+import { Type } from "class-transformer";
+import { Currency } from "@jorgecuadros/database";
+import { CreateCustomerDto } from "./create-customer.dto";
+import { ServiceDto } from "../properties/property.dto";
+
+/** The property, minus the customer it is being created for. */
+export class OnboardPropertyDto {
+  @IsOptional() @IsString() addressLine1?: string;
+  @IsOptional() @IsString() addressLine2?: string;
+  @IsOptional() @IsString() phone1?: string;
+}
+
+/**
+ * The opening balance the office takes when an account is opened, captured as
+ * the customer's first payment. Cash issues an EFE receipt; a check posts a
+ * CHECK DEPOSIT against that check number.
+ */
+export class OpeningPaymentDto {
+  @IsIn(["CASH", "CHECK"]) method!: "CASH" | "CHECK";
+  @IsNumber() amount!: number;
+  @IsEnum(Currency) currency!: Currency;
+  @IsString() @MinLength(1) receivedAt!: string;
+  @IsOptional() @IsString() checkNumber?: string;
+  /** Cash only: dollars credited to a pesos ledger. */
+  @IsOptional() @IsNumber() exchangeRate?: number;
+  @IsOptional() @IsString() concept?: string;
+}
+
+/** One screen: cliente + propiedad + servicios + saldo inicial. */
+export class OnboardCustomerDto {
+  @ValidateNested() @Type(() => CreateCustomerDto) customer!: CreateCustomerDto;
+
+  @IsOptional() @ValidateNested() @Type(() => OnboardPropertyDto)
+  property?: OnboardPropertyDto;
+
+  @IsOptional()
+  @IsArray()
+  @ArrayMaxSize(12)
+  @ValidateNested({ each: true })
+  @Type(() => ServiceDto)
+  services?: ServiceDto[];
+
+  @IsOptional() @ValidateNested() @Type(() => OpeningPaymentDto)
+  openingPayment?: OpeningPaymentDto;
+}

apps/web/src/app/clientes/alta/page.tsx

@@ -0,0 +1,291 @@
+"use client";
+
+import Link from "next/link";
+import { useEffect, useState } from "react";
+import { AppShell } from "@/components/AppShell";
+import { getNextFolderNumber, onboardCustomer } from "@/lib/api";
+import { useCan } from "@/lib/abilities";
+import { formatMoney, SERVICE_KIND_LABELS } from "@/lib/labels";
+import type { Currency, OnboardInput, OnboardResult, ServiceKind } from "@/lib/types";
+
+/**
+ * Alta de cliente in one screen (2026-10-08 meeting): the customer, their
+ * property, its services and the opening balance taken as the first payment,
+ * saved together or not at all. Cash issues an EFE receipt with its folio.
+ */
+export default function AltaClientePage() {
+  return (
+    <AppShell>
+      <Alta />
+    </AppShell>
+  );
+}
+
+type ServiceRow = { kind: ServiceKind; accountNumber: string; meterNumber: string };
+
+const today = () => new Date().toISOString().slice(0, 10);
+const t = (v: string) => v.trim() || undefined;
+
+function Alta() {
+  const allowed = useCan("customer:create");
+
+  const [folder, setFolder] = useState("");
+  const [name, setName] = useState("");
+  const [email, setEmail] = useState("");
+  const [phone, setPhone] = useState("");
+  const [mobile, setMobile] = useState("");
+  const [preferredCurrency, setPreferredCurrency] = useState<Currency>("USD");
+
+  const [address1, setAddress1] = useState("");
+  const [address2, setAddress2] = useState("");
+  const [propertyPhone, setPropertyPhone] = useState("");
+  const [services, setServices] = useState<ServiceRow[]>([]);
+
+  const [payAmount, setPayAmount] = useState("");
+  const [payMethod, setPayMethod] = useState<"CASH" | "CHECK">("CASH");
+  const [payCurrency, setPayCurrency] = useState<Currency>("MXN");
+  const [payDate, setPayDate] = useState(today);
+  const [checkNumber, setCheckNumber] = useState("");
+  const [exchangeRate, setExchangeRate] = useState("");
+  const [concept, setConcept] = useState("");
+
+  const [busy, setBusy] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const [done, setDone] = useState<OnboardResult | null>(null);
+
+  useEffect(() => {
+    getNextFolderNumber()
+      .then((r) => setFolder((prev) => prev || String(r.folderNumber)))
+      .catch(() => {});
+  }, []);
+
+  const hasProperty = !!(address1.trim() || address2.trim() || propertyPhone.trim() || services.length);
+  const paying = Number(payAmount) > 0;
+
+  function setService(i: number, patch: Partial<ServiceRow>) {
+    setServices((prev) => prev.map((s, j) => (j === i ? { ...s, ...patch } : s)));
+  }
+
+  async function submit(e: React.FormEvent) {
+    e.preventDefault();
+    setBusy(true);
+    setError(null);
+    const input: OnboardInput = {
+      customer: {
+        name: name.trim(),
+        folderNumber: folder ? Number(folder) : undefined,
+        email: t(email),
+        phone: t(phone),
+        mobile: t(mobile),
+        preferredCurrency,
+      },
+      ...(hasProperty && {
+        property: { addressLine1: t(address1), addressLine2: t(address2), phone1: t(propertyPhone) },
+        services: services.map((s) => ({
+          kind: s.kind,
+          accountNumber: t(s.accountNumber),
+          meterNumber: t(s.meterNumber),
+        })),
+      }),
+      ...(paying && {
+        openingPayment: {
+          method: payMethod,
+          amount: Number(payAmount),
+          currency: payCurrency,
+          receivedAt: payDate,
+          checkNumber: payMethod === "CHECK" ? t(checkNumber) : undefined,
+          exchangeRate:
+            payMethod === "CASH" && payCurrency === "USD" && exchangeRate
+              ? Number(exchangeRate)
+              : undefined,
+          concept: t(concept),
+        },
+      }),
+    };
+    try {
+      setDone(await onboardCustomer(input));
+    } catch (e2) {
+      setError((e2 as Error)?.message ?? "No se pudo dar de alta al cliente.");
+    } finally {
+      setBusy(false);
+    }
+  }
+
+  if (!allowed) {
+    return <div className="state-box state-error">No tiene permisos para crear clientes.</div>;
+  }
+
+  if (done) {
+    return (
+      <div className="stack">
+        <h1 className="page-title">Cliente dado de alta</h1>
+        <div className="card" style={{ padding: 20 }}>
+          <p>
+            <strong>{done.customer.name}</strong>
+            {done.customer.folderNumber != null && ` · Carpeta ${done.customer.folderNumber}`}
+          </p>
+          {done.receipt && (
+            <p>
+              Saldo inicial recibido en efectivo, folio {done.receipt.folio}.{" "}
+              <Link href={`/efectivo/${done.receipt.folio}`} target="_blank">
+                Imprimir recibo
+              </Link>
+            </p>
+          )}
+          {done.payment && <p>Saldo inicial registrado con el cheque {checkNumber}.</p>}
+          <div className="form-actions">
+            <Link href={`/clientes/${done.customer.id}`} className="btn btn-primary">
+              Ver cliente
+            </Link>
+            <button type="button" className="btn btn-outline" onClick={() => location.reload()}>
+              Otra alta
+            </button>
+          </div>
+        </div>
+      </div>
+    );
+  }
+
+  return (
+    <form onSubmit={submit}>
+      <div className="page-head">
+        <Link href="/clientes" className="back-link">← Clientes</Link>
+        <h1 className="page-title">Alta de cliente</h1>
+      </div>
+      {error && <div className="state-box state-error">{error}</div>}
+
+      <div className="card" style={{ padding: 20, marginBottom: 16 }}>
+        <h2 className="section-title" style={{ marginBottom: 14 }}>Cliente</h2>
+        <div className="form-grid">
+          <Field label="Carpeta">
+            <input className="input" type="number" min={1} value={folder}
+              onChange={(e) => setFolder(e.target.value)} />
+          </Field>
+          <Field label="Nombre *">
+            <input className="input" required value={name} onChange={(e) => setName(e.target.value)} />
+          </Field>
+          <Field label="Correo">
+            <input className="input" type="email" value={email} onChange={(e) => setEmail(e.target.value)} />
+          </Field>
+          <Field label="Teléfono">
+            <input className="input" value={phone} onChange={(e) => setPhone(e.target.value)} />
+          </Field>
+          <Field label="Celular">
+            <input className="input" value={mobile} onChange={(e) => setMobile(e.target.value)} />
+          </Field>
+          <Field label="Moneda preferida">
+            <select className="select" value={preferredCurrency}
+              onChange={(e) => setPreferredCurrency(e.target.value as Currency)}>
+              <option value="USD">USD</option>
+              <option value="MXN">MXN</option>
+            </select>
+          </Field>
+        </div>
+      </div>
+
+      <div className="card" style={{ padding: 20, marginBottom: 16 }}>
+        <h2 className="section-title" style={{ marginBottom: 14 }}>Propiedad y servicios</h2>
+        <div className="form-grid">
+          <Field label="Dirección 1">
+            <input className="input" value={address1} onChange={(e) => setAddress1(e.target.value)} />
+          </Field>
+          <Field label="Dirección 2">
+            <input className="input" value={address2} onChange={(e) => setAddress2(e.target.value)} />
+          </Field>
+          <Field label="Teléfono de la propiedad">
+            <input className="input" value={propertyPhone} onChange={(e) => setPropertyPhone(e.target.value)} />
+          </Field>
+        </div>
+        {services.map((s, i) => (
+          <div key={i} className="inline-form" style={{ flexWrap: "wrap", gap: 12, marginTop: 12 }}>
+            <select className="select" value={s.kind}
+              onChange={(e) => setService(i, { kind: e.target.value as ServiceKind })}>
+              {Object.entries(SERVICE_KIND_LABELS).map(([k, label]) => (
+                <option key={k} value={k}>{label}</option>
+              ))}
+            </select>
+            <input className="input" placeholder="Cuenta / referencia" value={s.accountNumber}
+              onChange={(e) => setService(i, { accountNumber: e.target.value })} />
+            <input className="input" placeholder="Medidor" value={s.meterNumber}
+              onChange={(e) => setService(i, { meterNumber: e.target.value })} />
+            <button type="button" className="btn btn-ghost"
+              onClick={() => setServices((prev) => prev.filter((_, j) => j !== i))}>
+              Quitar
+            </button>
+          </div>
+        ))}
+        <button type="button" className="btn btn-ghost" style={{ marginTop: 12 }}
+          onClick={() => setServices((prev) => [...prev, { kind: "WATER", accountNumber: "", meterNumber: "" }])}>
+          + Agregar servicio
+        </button>
+      </div>
+
+      <div className="card" style={{ padding: 20, marginBottom: 16 }}>
+        <h2 className="section-title" style={{ marginBottom: 14 }}>Saldo inicial (pago)</h2>
+        <div className="form-grid">
+          <Field label="Monto">
+            <input className="input" type="number" step="0.01" min="0" value={payAmount}
+              placeholder="Vacío = sin saldo inicial"
+              onChange={(e) => setPayAmount(e.target.value)} />
+          </Field>
+          <Field label="Moneda">
+            <select className="select" value={payCurrency}
+              onChange={(e) => setPayCurrency(e.target.value as Currency)}>
+              <option value="MXN">MXN</option>
+              <option value="USD">USD</option>
+            </select>
+          </Field>
+          <Field label="Forma de pago">
+            <select className="select" value={payMethod}
+              onChange={(e) => setPayMethod(e.target.value as "CASH" | "CHECK")}>
+              <option value="CASH">Efectivo (emite recibo EFE)</option>
+              <option value="CHECK">Cheque</option>
+            </select>
+          </Field>
+          <Field label="Fecha">
+            <input className="input" type="date" value={payDate} onChange={(e) => setPayDate(e.target.value)} />
+          </Field>
+          {payMethod === "CHECK" && (
+            <Field label="Número de cheque *">
+              <input className="input" required={paying} value={checkNumber}
+                onChange={(e) => setCheckNumber(e.target.value)} />
+            </Field>
+          )}
+          {payMethod === "CASH" && payCurrency === "USD" && (
+            <Field label="Tipo de cambio (abonar en pesos)">
+              <input className="input" type="number" step="0.0001" min="0" value={exchangeRate}
+                placeholder="Vacío = abonar en dólares"
+                onChange={(e) => setExchangeRate(e.target.value)} />
+            </Field>
+          )}
+          <Field label="Concepto">
+            <input className="input" placeholder="SALDO INICIAL" value={concept}
+              onChange={(e) => setConcept(e.target.value)} />
+          </Field>
+        </div>
+        {paying && (
+          <p className="page-sub" style={{ marginTop: 12 }}>
+            Se abonará {formatMoney(payAmount, payCurrency)} a la cuenta del cliente
+            {payMethod === "CASH" ? " y se emitirá el recibo de efectivo con el siguiente folio." : "."}
+          </p>
+        )}
+      </div>
+
+      <div className="form-actions">
+        <button type="submit" className="btn btn-primary" disabled={busy || !name.trim()}>
+          {busy ? "Guardando…" : "Dar de alta"}
+        </button>
+        <Link href="/clientes" className="btn btn-outline">Cancelar</Link>
+      </div>
+    </form>
+  );
+}
+
+function Field({ label, children }: { label: string; children: React.ReactNode }) {
+  return (
+    <label className="field">
+      <span className="field-label">{label}</span>
+      {children}
+    </label>
+  );
+}

apps/web/src/app/clientes/page.tsx

@@ -107,9 +107,14 @@ function ClientesBrowser() {
             ]}
           />
           {canCreate && (
-            <Link href="/clientes/nuevo" className="btn btn-primary">
+            <>
-              + Nuevo cliente
+              <Link href="/clientes/nuevo" className="btn btn-outline">
-            </Link>
+                + Solo cliente
+              </Link>
+              <Link href="/clientes/alta" className="btn btn-primary">
+                + Alta de cliente
+              </Link>
+            </>
           )}
         </div>
         <StatStrip stats={stats} />

apps/web/src/lib/api.ts

@@ -84,6 +84,8 @@ import type {
   CashReceipt,
   CashReceiptInput,
   CompanyHeader,
+  OnboardInput,
+  OnboardResult,
 } from "./types";
 
 // Resolve the API origin at runtime, not build time — so one built image serves
@@ -228,6 +230,14 @@ export function getCustomer(id: string): Promise<CustomerDetail> {
   return apiFetch<CustomerDetail>(`/customers/${id}`);
 }
 
+/** Open an account in one step; see OnboardInput. */
+export function onboardCustomer(input: OnboardInput): Promise<OnboardResult> {
+  return apiFetch<OnboardResult>("/customers/onboard", {
+    method: "POST",
+    body: JSON.stringify(input),
+  });
+}
+
 export function createCustomer(input: CustomerInput): Promise<CustomerDetail> {
   return apiFetch<CustomerDetail>("/customers", {
     method: "POST",

apps/web/src/lib/types.ts

@@ -1723,3 +1723,26 @@ export interface CashReceiptInput {
   concept: string;
   depositedAt?: string;
 }
+
+/** One-screen account opening: cliente + propiedad + servicios + saldo inicial. */
+export interface OnboardInput {
+  customer: CustomerInput;
+  property?: { addressLine1?: string; addressLine2?: string; phone1?: string };
+  services?: { kind: ServiceKind; accountNumber?: string; meterNumber?: string }[];
+  openingPayment?: {
+    method: "CASH" | "CHECK";
+    amount: number;
+    currency: Currency;
+    receivedAt: string;
+    checkNumber?: string;
+    exchangeRate?: number;
+    concept?: string;
+  };
+}
+
+export interface OnboardResult {
+  customer: { id: string; name: string; folderNumber: number | null };
+  property: { id: string } | null;
+  receipt: { folio: number } | null;
+  payment: { id: string } | null;
+}