diff --git a/src/app/api/portal/payments/coming-soon/route.ts b/src/app/api/portal/payments/coming-soon/route.ts
new file mode 100644
index 0000000..60fe851
--- /dev/null
+++ b/src/app/api/portal/payments/coming-soon/route.ts
@@ -0,0 +1,42 @@
+/**
+ * GET /api/portal/payments/coming-soon
+ *
+ * Returns the subscriber's outstanding balance and payment instructions.
+ * Online payments are scaffolded -- actual payment gateway integration is deferred to v2.
+ */
+
+import { NextResponse } from "next/server";
+import { withPortalAuth } from "@/lib/middleware/portal-auth";
+import { prisma } from "@/lib/prisma";
+
+export const GET = withPortalAuth(async (_req, { subscriberId, tenantId, tenantPrisma }) => {
+  // Get outstanding balance: sum of unpaid invoice amounts (totalAmount - amountPaid)
+  // for invoices that are SENT, PARTIAL, or OVERDUE
+  const invoices = await tenantPrisma.invoice.findMany({
+    where: {
+      subscriberId,
+      status: { in: ["SENT", "PARTIAL", "OVERDUE"] },
+    },
+    select: {
+      totalAmount: true,
+      amountPaid: true,
+    },
+  });
+
+  let outstandingBalance = 0;
+  for (const inv of invoices) {
+    outstandingBalance += Number(inv.totalAmount) - Number(inv.amountPaid);
+  }
+
+  // Get tenant payment instructions
+  const settings = await prisma.tenantSettings.findFirst({
+    where: { tenantId },
+    select: { paymentInstructions: true },
+  });
+
+  return NextResponse.json({
+    outstandingBalance: Math.round(outstandingBalance * 100) / 100,
+    paymentInstructions: settings?.paymentInstructions || null,
+    message: "Online payments coming soon",
+  });
+});
diff --git a/src/app/api/portal/tickets/[id]/comments/route.ts b/src/app/api/portal/tickets/[id]/comments/route.ts
new file mode 100644
index 0000000..7a87f26
--- /dev/null
+++ b/src/app/api/portal/tickets/[id]/comments/route.ts
@@ -0,0 +1,61 @@
+/**
+ * GET /api/portal/tickets/[id]/comments — List comments for a ticket
+ * POST /api/portal/tickets/[id]/comments — Add a comment to a ticket
+ */
+
+import { NextRequest, NextResponse } from "next/server";
+import { withPortalAuth } from "@/lib/middleware/portal-auth";
+import {
+  getPortalTicket,
+  addTicketComment,
+} from "@/lib/services/portal-ticket-service";
+
+export function GET(req: NextRequest, { params }: { params: Promise<{ id: string }> }) {
+  return withPortalAuth(async (_req, { subscriberId, tenantPrisma }) => {
+    const { id } = await params;
+
+    const ticket = await getPortalTicket(tenantPrisma, subscriberId, id);
+
+    if (!ticket) {
+      return NextResponse.json({ error: "Ticket not found" }, { status: 404 });
+    }
+
+    return NextResponse.json({ comments: ticket.comments });
+  })(req);
+}
+
+export function POST(req: NextRequest, { params }: { params: Promise<{ id: string }> }) {
+  return withPortalAuth(async (innerReq, { subscriberId, tenantId, tenantPrisma }) => {
+    const { id } = await params;
+    const body = await innerReq.json();
+    const { message } = body;
+
+    if (!message || !message.trim()) {
+      return NextResponse.json(
+        { error: "message is required" },
+        { status: 400 }
+      );
+    }
+
+    try {
+      const comment = await addTicketComment(
+        tenantPrisma,
+        tenantId,
+        subscriberId,
+        id,
+        message
+      );
+
+      return NextResponse.json(comment, { status: 201 });
+    } catch (err) {
+      const msg = err instanceof Error ? err.message : String(err);
+      if (msg.includes("not found")) {
+        return NextResponse.json({ error: msg }, { status: 404 });
+      }
+      if (msg.includes("closed")) {
+        return NextResponse.json({ error: msg }, { status: 400 });
+      }
+      return NextResponse.json({ error: msg }, { status: 400 });
+    }
+  })(req);
+}
diff --git a/src/app/api/portal/tickets/[id]/route.ts b/src/app/api/portal/tickets/[id]/route.ts
new file mode 100644
index 0000000..83fa5d3
--- /dev/null
+++ b/src/app/api/portal/tickets/[id]/route.ts
@@ -0,0 +1,21 @@
+/**
+ * GET /api/portal/tickets/[id] — Get ticket detail with conversation thread
+ */
+
+import { NextRequest, NextResponse } from "next/server";
+import { withPortalAuth } from "@/lib/middleware/portal-auth";
+import { getPortalTicket } from "@/lib/services/portal-ticket-service";
+
+export function GET(req: NextRequest, { params }: { params: Promise<{ id: string }> }) {
+  return withPortalAuth(async (_req, { subscriberId, tenantPrisma }) => {
+    const { id } = await params;
+
+    const ticket = await getPortalTicket(tenantPrisma, subscriberId, id);
+
+    if (!ticket) {
+      return NextResponse.json({ error: "Ticket not found" }, { status: 404 });
+    }
+
+    return NextResponse.json(ticket);
+  })(req);
+}
diff --git a/src/app/api/portal/tickets/route.ts b/src/app/api/portal/tickets/route.ts
new file mode 100644
index 0000000..595549f
--- /dev/null
+++ b/src/app/api/portal/tickets/route.ts
@@ -0,0 +1,46 @@
+/**
+ * GET /api/portal/tickets — List subscriber's tickets (paginated)
+ * POST /api/portal/tickets — Create a new support ticket
+ */
+
+import { NextRequest, NextResponse } from "next/server";
+import { withPortalAuth } from "@/lib/middleware/portal-auth";
+import {
+  createPortalTicket,
+  listPortalTickets,
+} from "@/lib/services/portal-ticket-service";
+
+export const GET = withPortalAuth(async (req, { subscriberId, tenantPrisma }) => {
+  const { searchParams } = new URL(req.url);
+  const page = parseInt(searchParams.get("page") || "1", 10);
+  const limit = parseInt(searchParams.get("limit") || "20", 10);
+
+  const result = await listPortalTickets(tenantPrisma, subscriberId, { page, limit });
+
+  return NextResponse.json(result);
+});
+
+export const POST = withPortalAuth(async (req, { subscriberId, tenantId, tenantPrisma }) => {
+  const body = await req.json();
+  const { categoryId, subject, description } = body;
+
+  if (!categoryId || !subject || !description) {
+    return NextResponse.json(
+      { error: "categoryId, subject, and description are required" },
+      { status: 400 }
+    );
+  }
+
+  try {
+    const ticket = await createPortalTicket(tenantPrisma, tenantId, subscriberId, {
+      categoryId,
+      subject,
+      description,
+    });
+
+    return NextResponse.json(ticket, { status: 201 });
+  } catch (err) {
+    const message = err instanceof Error ? err.message : String(err);
+    return NextResponse.json({ error: message }, { status: 400 });
+  }
+});
diff --git a/src/lib/__tests__/portal-ticket-service.test.ts b/src/lib/__tests__/portal-ticket-service.test.ts
new file mode 100644
index 0000000..918a116
--- /dev/null
+++ b/src/lib/__tests__/portal-ticket-service.test.ts
@@ -0,0 +1,340 @@
+/**
+ * Portal Ticket Service Integration Tests
+ *
+ * Tests subscriber-scoped ticket creation, conversation threads, and isolation:
+ * 1. createPortalTicket creates ticket with SUBSCRIBER source
+ * 2. createPortalTicket ticket appears in staff listTickets
+ * 3. listPortalTickets returns only subscriber's tickets
+ * 4. addTicketComment creates conversation entry
+ * 5. addTicketComment rejects on closed ticket
+ * 6. getPortalTicket returns ticket with full conversation thread
+ *
+ * CLEANUP ORDER:
+ * ticketComments -> tickets -> ticketCategories -> subscribers ->
+ * servicePlans -> tenantSettings -> accountingPeriods -> accounts ->
+ * users -> tenant
+ */
+
+import { prisma } from "@/lib/prisma";
+import { withTenantContext } from "@/lib/prisma-tenant";
+import { seedChartOfAccounts } from "@/lib/accounting/seed-coa";
+import {
+  createPortalTicket,
+  listPortalTickets,
+  getPortalTicket,
+  addTicketComment,
+  ensurePortalUser,
+} from "@/lib/services/portal-ticket-service";
+import { listTickets } from "@/lib/services/ticket-service";
+import { BillingType, TenantStatus, TicketStatus } from "@prisma/client";
+import bcrypt from "bcryptjs";
+
+// ---------------------------------------------------------------------------
+// Shared test state
+// ---------------------------------------------------------------------------
+
+const TS = Date.now();
+
+let tenantId: string;
+let planId: string;
+let subscriberAId: string;
+let subscriberBId: string;
+let categoryId: string;
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+function db() {
+  return withTenantContext(tenantId);
+}
+
+// ---------------------------------------------------------------------------
+// Setup / Teardown
+// ---------------------------------------------------------------------------
+
+beforeAll(async () => {
+  // Create tenant
+  const tenant = await prisma.tenant.create({
+    data: {
+      name: `PortalTicket Test ${TS}`,
+      slug: `portal-ticket-${TS}`,
+      ownerEmail: `portal-ticket-${TS}@test.example`,
+      status: TenantStatus.ACTIVE,
+    },
+  });
+  tenantId = tenant.id;
+
+  // Seed COA (needed for createTenant convention)
+  await prisma.$transaction(async (tx) => {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    await seedChartOfAccounts(tx as any, tenantId);
+  });
+
+  // Create tenant settings
+  await prisma.tenantSettings.create({
+    data: {
+      tenantId,
+      autoSuspendDays: 30,
+      prepaidLeadDays: 7,
+      paymentInstructions: "Send payment via GCash to 09171234567",
+    },
+  });
+
+  // Create service plan
+  const plan = await prisma.servicePlan.create({
+    data: {
+      tenantId,
+      name: `Ticket Plan ${TS}`,
+      speed: "50 Mbps",
+      monthlyPrice: 49.99,
+      billingType: BillingType.POSTPAID,
+    },
+  });
+  planId = plan.id;
+
+  // Create subscriber A (with portal access)
+  const passwordHash = bcrypt.hashSync("subscriber-pass-123", 10);
+  const subA = await prisma.subscriber.create({
+    data: {
+      tenantId,
+      accountNumber: `TKT-A-${TS}`,
+      firstName: "Alice",
+      lastName: "Ticketer",
+      email: `alice-tkt-${TS}@subscriber.example`,
+      address: "123 Ticket St",
+      servicePlanId: planId,
+      status: "ACTIVE",
+      billingDay: 15,
+      passwordHash,
+    },
+  });
+  subscriberAId = subA.id;
+
+  // Create subscriber B (for isolation tests)
+  const subB = await prisma.subscriber.create({
+    data: {
+      tenantId,
+      accountNumber: `TKT-B-${TS}`,
+      firstName: "Bob",
+      lastName: "Ticketer",
+      address: "456 Other St",
+      servicePlanId: planId,
+      status: "ACTIVE",
+      billingDay: 20,
+      passwordHash: bcrypt.hashSync("bob-pass-456", 10),
+    },
+  });
+  subscriberBId = subB.id;
+
+  // Seed a ticket category (createTenant seeds defaults, but we need to get the ID)
+  const categories = await prisma.ticketCategory.findMany({
+    where: { tenantId },
+    take: 1,
+  });
+
+  if (categories.length > 0) {
+    categoryId = categories[0].id;
+  } else {
+    // Fallback: create one manually
+    const cat = await prisma.ticketCategory.create({
+      data: {
+        tenantId,
+        name: `Test Category ${TS}`,
+        description: "Test ticket category",
+        isActive: true,
+      },
+    });
+    categoryId = cat.id;
+  }
+});
+
+afterAll(async () => {
+  if (!tenantId) return;
+
+  // 1. Ticket comments
+  await prisma.ticketComment.deleteMany({ where: { tenantId } }).catch(() => {});
+  // 2. Job orders (tickets FK constraint)
+  await prisma.jobOrder.deleteMany({ where: { tenantId } }).catch(() => {});
+  // 3. Tickets
+  await prisma.ticket.deleteMany({ where: { tenantId } }).catch(() => {});
+  // 4. Ticket categories
+  await prisma.ticketCategory.deleteMany({ where: { tenantId } }).catch(() => {});
+  // 5. Subscribers
+  await prisma.subscriber.deleteMany({ where: { tenantId } }).catch(() => {});
+  // 6. Service plans
+  await prisma.servicePlan.deleteMany({ where: { tenantId } }).catch(() => {});
+  // 7. Tenant settings
+  await prisma.tenantSettings.deleteMany({ where: { tenantId } }).catch(() => {});
+  // 8. Accounting periods
+  await prisma.accountingPeriod.deleteMany({ where: { tenantId } }).catch(() => {});
+  // 9. Accounts
+  await prisma.account.deleteMany({ where: { tenantId } }).catch(() => {});
+  // 10. Users (including shadow portal users)
+  await prisma.user.deleteMany({ where: { tenantId } }).catch(() => {});
+  // 11. Tenant
+  await prisma.tenant.delete({ where: { id: tenantId } }).catch(() => {});
+
+  await prisma.$disconnect();
+});
+
+// ===========================================================================
+// TESTS
+// ===========================================================================
+
+describe("PortalTicketService", () => {
+  // -----------------------------------------------------------------------
+  // 1. createPortalTicket creates ticket with SUBSCRIBER source
+  // -----------------------------------------------------------------------
+  it("createPortalTicket creates ticket with SUBSCRIBER source", async () => {
+    const ticket = await createPortalTicket(db(), tenantId, subscriberAId, {
+      categoryId,
+      subject: "My internet is slow",
+      description: "Speed test shows only 5 Mbps instead of 50 Mbps",
+    });
+
+    expect(ticket).toBeDefined();
+    expect(ticket.source).toBe("SUBSCRIBER");
+    expect(ticket.status).toBe("OPEN");
+    expect(ticket.subscriberId).toBe(subscriberAId);
+    expect(ticket.subject).toBe("My internet is slow");
+    expect(ticket.ticketNumber).toMatch(/^TKT-\d{4}$/);
+  });
+
+  // -----------------------------------------------------------------------
+  // 2. createPortalTicket ticket appears in staff listTickets
+  // -----------------------------------------------------------------------
+  it("createPortalTicket ticket appears in staff listTickets", async () => {
+    const ticket = await createPortalTicket(db(), tenantId, subscriberAId, {
+      categoryId,
+      subject: "Billing question",
+      description: "Why was I charged extra this month?",
+    });
+
+    // Query via staff ticket service (no subscriber filter)
+    const staffResult = await listTickets(db());
+    const found = staffResult.tickets.find(
+      (t: { id: string }) => t.id === ticket.id
+    );
+
+    expect(found).toBeDefined();
+    expect(found.source).toBe("SUBSCRIBER");
+    expect(found.subscriberId).toBe(subscriberAId);
+  });
+
+  // -----------------------------------------------------------------------
+  // 3. listPortalTickets returns only subscriber's tickets
+  // -----------------------------------------------------------------------
+  it("listPortalTickets returns only subscriber's tickets", async () => {
+    // Create tickets for subscriber A
+    await createPortalTicket(db(), tenantId, subscriberAId, {
+      categoryId,
+      subject: "Alice ticket 1",
+      description: "Alice issue",
+    });
+
+    // Create ticket for subscriber B
+    await createPortalTicket(db(), tenantId, subscriberBId, {
+      categoryId,
+      subject: "Bob ticket 1",
+      description: "Bob issue",
+    });
+
+    // List for subscriber A
+    const resultA = await listPortalTickets(db(), subscriberAId);
+    for (const t of resultA.tickets) {
+      expect(t.subscriberId).toBe(subscriberAId);
+    }
+
+    // List for subscriber B
+    const resultB = await listPortalTickets(db(), subscriberBId);
+    for (const t of resultB.tickets) {
+      expect(t.subscriberId).toBe(subscriberBId);
+    }
+
+    // Subscriber A should NOT see subscriber B's tickets
+    const aTicketSubjects = resultA.tickets.map((t: { subject: string }) => t.subject);
+    expect(aTicketSubjects).not.toContain("Bob ticket 1");
+  });
+
+  // -----------------------------------------------------------------------
+  // 4. addTicketComment creates conversation entry
+  // -----------------------------------------------------------------------
+  it("addTicketComment creates conversation entry", async () => {
+    const ticket = await createPortalTicket(db(), tenantId, subscriberAId, {
+      categoryId,
+      subject: "Need help with router",
+      description: "Router keeps disconnecting",
+    });
+
+    const comment = await addTicketComment(
+      db(),
+      tenantId,
+      subscriberAId,
+      ticket.id,
+      "It happened again just now"
+    );
+
+    expect(comment).toBeDefined();
+    expect(comment.message).toBe("It happened again just now");
+    expect(comment.subscriberId).toBe(subscriberAId);
+    expect(comment.author).toBeDefined();
+    expect(comment.author.firstName).toBe("Alice");
+  });
+
+  // -----------------------------------------------------------------------
+  // 5. addTicketComment rejects on closed ticket
+  // -----------------------------------------------------------------------
+  it("addTicketComment rejects on closed ticket", async () => {
+    const ticket = await createPortalTicket(db(), tenantId, subscriberAId, {
+      categoryId,
+      subject: "Will be closed",
+      description: "This ticket will be closed",
+    });
+
+    // Close the ticket directly (simulating staff action)
+    await prisma.ticket.update({
+      where: { id: ticket.id },
+      data: { status: TicketStatus.CLOSED, closedAt: new Date() },
+    });
+
+    await expect(
+      addTicketComment(db(), tenantId, subscriberAId, ticket.id, "Can I still comment?")
+    ).rejects.toThrow("Cannot comment on a closed ticket");
+  });
+
+  // -----------------------------------------------------------------------
+  // 6. getPortalTicket returns ticket with full conversation thread
+  // -----------------------------------------------------------------------
+  it("getPortalTicket returns ticket with full conversation thread", async () => {
+    const ticket = await createPortalTicket(db(), tenantId, subscriberAId, {
+      categoryId,
+      subject: "Thread test",
+      description: "Testing conversation thread",
+    });
+
+    // Add 3 comments
+    await addTicketComment(db(), tenantId, subscriberAId, ticket.id, "Comment 1");
+    await addTicketComment(db(), tenantId, subscriberAId, ticket.id, "Comment 2");
+    await addTicketComment(db(), tenantId, subscriberAId, ticket.id, "Comment 3");
+
+    const result = await getPortalTicket(db(), subscriberAId, ticket.id);
+
+    expect(result).not.toBeNull();
+    expect(result!.comments).toHaveLength(3);
+
+    // Verify chronological order (ASC)
+    const messages = result!.comments.map((c: { message: string }) => c.message);
+    expect(messages).toEqual(["Comment 1", "Comment 2", "Comment 3"]);
+
+    // Verify each comment has author info
+    for (const comment of result!.comments) {
+      expect(comment.author).toBeDefined();
+      expect(comment.author.firstName).toBe("Alice");
+    }
+
+    // Security: subscriber B cannot see subscriber A's ticket
+    const crossCheck = await getPortalTicket(db(), subscriberBId, ticket.id);
+    expect(crossCheck).toBeNull();
+  });
+});