diff --git a/src/app/api/v1/driver/payment-proof/[poId]/route.test.ts b/src/app/api/v1/driver/payment-proof/[poId]/route.test.ts
new file mode 100644
index 0000000..f39f24d
--- /dev/null
+++ b/src/app/api/v1/driver/payment-proof/[poId]/route.test.ts
@@ -0,0 +1,39 @@
+import { NextRequest } from "next/server";
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import { getBrowserSessionUser } from "@/lib/server/browser-session";
+import { fetchDriverPaymentProof, listDriverPaymentProofs } from "@/lib/server/driver-payment-proof-service";
+import { GET } from "./route";
+
+vi.mock("@/lib/server/browser-session", () => ({ getBrowserSessionUser: vi.fn() }));
+vi.mock("@/lib/server/driver-payment-proof-service", () => ({
+  fetchDriverPaymentProof: vi.fn(),
+  listDriverPaymentProofs: vi.fn(),
+}));
+
+const url = "http://localhost/api/v1/driver/payment-proof/po1";
+const ctx = { params: Promise.resolve({ poId: "po1" }) };
+
+beforeEach(() => vi.resetAllMocks());
+
+describe("driver payment proof route", () => {
+  it("requires the driver session before looking up a proof file", async () => {
+    vi.mocked(getBrowserSessionUser).mockRejectedValue(Object.assign(new Error(), { status: 401 }));
+
+    expect((await GET(new NextRequest(`${url}?payment=request1`), ctx)).status).toBe(401);
+    expect(fetchDriverPaymentProof).not.toHaveBeenCalled();
+  });
+
+  it("returns only payment identifiers and checks access again when streaming the file", async () => {
+    vi.mocked(getBrowserSessionUser).mockResolvedValue({ id: "driver1", name: "Driver", user_type: null });
+    vi.mocked(listDriverPaymentProofs).mockResolvedValue([{ requestId: "request1", recordId: "line1", filename: "proof.pdf" }]);
+    vi.mocked(fetchDriverPaymentProof).mockResolvedValue({ body: new Response("test PDF").body!, contentType: "application/pdf" });
+
+    const list = await GET(new NextRequest(url), ctx);
+    expect(await list.json()).toEqual({ payments: ["request1"] });
+    const file = await GET(new NextRequest(`${url}?payment=request1`), ctx);
+    expect(fetchDriverPaymentProof).toHaveBeenCalledWith("po1", "driver1", "request1");
+    expect(file.headers.get("cache-control")).toBe("private, no-store");
+    expect(file.headers.get("content-type")).toBe("application/pdf");
+    expect(await file.text()).toBe("test PDF");
+  });
+});
diff --git a/src/app/api/v1/driver/payment-proof/[poId]/route.ts b/src/app/api/v1/driver/payment-proof/[poId]/route.ts
new file mode 100644
index 0000000..c61fd44
--- /dev/null
+++ b/src/app/api/v1/driver/payment-proof/[poId]/route.ts
@@ -0,0 +1,38 @@
+import { NextRequest, NextResponse } from "next/server";
+import { getBrowserSessionUser } from "@/lib/server/browser-session";
+import { fetchDriverPaymentProof, listDriverPaymentProofs } from "@/lib/server/driver-payment-proof-service";
+
+const headers = {
+  "Access-Control-Allow-Origin": "*",
+  "Access-Control-Allow-Methods": "GET, OPTIONS",
+  "Access-Control-Allow-Headers": "Authorization",
+  "Cache-Control": "private, no-store",
+};
+
+export function OPTIONS() {
+  return new NextResponse(null, { status: 204, headers });
+}
+
+export async function GET(req: NextRequest, { params }: { params: Promise<{ poId: string }> }) {
+  try {
+    const user = await getBrowserSessionUser(req);
+    const { poId } = await params;
+    const requestId = req.nextUrl.searchParams.get("payment");
+    if (requestId === null) {
+      const proofs = await listDriverPaymentProofs(poId, user.id);
+      return NextResponse.json({ payments: proofs.map((proof) => proof.requestId) }, { headers });
+    }
+
+    const file = await fetchDriverPaymentProof(poId, user.id, requestId);
+    if (!file) return NextResponse.json({ error: "Proof of payment is unavailable." }, { status: 404, headers });
+    return new NextResponse(file.body, {
+      headers: { ...headers, "Content-Type": file.contentType, "X-Content-Type-Options": "nosniff" },
+    });
+  } catch (error) {
+    const unauthorized = (error as { status?: number } | null)?.status === 401;
+    return NextResponse.json(
+      { error: unauthorized ? "Sign in to view proof of payment." : "Could not load proof of payment." },
+      { status: unauthorized ? 401 : 500, headers },
+    );
+  }
+}
diff --git a/src/lib/server/driver-payment-proof-service.test.ts b/src/lib/server/driver-payment-proof-service.test.ts
new file mode 100644
index 0000000..f50219a
--- /dev/null
+++ b/src/lib/server/driver-payment-proof-service.test.ts
@@ -0,0 +1,45 @@
+import { describe, expect, it, vi } from "vitest";
+import { listDriverPaymentProofs } from "./driver-payment-proof-service";
+
+const { getFullList, getOne, filter } = vi.hoisted(() => ({
+  getFullList: vi.fn(),
+  getOne: vi.fn(),
+  filter: vi.fn(),
+}));
+
+vi.mock("./pocketbase-admin", () => ({
+  getAdminPocketBase: async () => ({
+    filter,
+    collection: (name: string) => name === "order_items" ? { getFullList } : { getOne },
+  }),
+}));
+
+describe("driver payment proofs", () => {
+  it("uses only paid, attached evidence on assigned PO lines and lists a shared payment once", async () => {
+    const line = { order: "order1", supplier: "supplier1", payment_status: "paid", payment_request: "request1", order_item_attachements: ["proof.pdf"] };
+    getFullList.mockResolvedValue([{ ...line, id: "line1" }, { ...line, id: "line2" }]);
+    getOne.mockResolvedValue({
+      id: "request1", status: "paid", order: "order1", supplier: "supplier1",
+      items: ["line1", "line2", "other"],
+      documents: [
+        { role: "proof", collection: "order_items", recordId: "other", filename: "private.pdf" },
+        { role: "support", collection: "order_items", recordId: "line1", filename: "proof.pdf" },
+        { role: "proof", collection: "order_items", recordId: "line1", filename: "missing.pdf" },
+        { role: "proof", collection: "order_items", recordId: "line2", filename: "proof.pdf" },
+      ],
+    });
+
+    expect(await listDriverPaymentProofs("po1", "driver1")).toEqual([
+      { requestId: "request1", recordId: "line2", filename: "proof.pdf" },
+    ]);
+    expect(filter).toHaveBeenCalledWith(expect.stringContaining('drv_id = {:driverId}'), { poId: "po1", driverId: "driver1" });
+    expect(getOne).toHaveBeenCalledTimes(1);
+  });
+
+  it("returns nothing if the driver has no matching assigned lines", async () => {
+    getOne.mockClear();
+    getFullList.mockResolvedValue([]);
+    expect(await listDriverPaymentProofs("po1", "other-driver")).toEqual([]);
+    expect(getOne).not.toHaveBeenCalled();
+  });
+});
diff --git a/src/lib/server/driver-payment-proof-service.ts b/src/lib/server/driver-payment-proof-service.ts
new file mode 100644
index 0000000..56b2809
--- /dev/null
+++ b/src/lib/server/driver-payment-proof-service.ts
@@ -0,0 +1,54 @@
+import type { SupplierPaymentRequest } from "@/lib/order-payments";
+import { attachmentList } from "./order-item-files";
+import { getAdminPocketBase } from "./pocketbase-admin";
+
+type Pb = Awaited<ReturnType<typeof getAdminPocketBase>>;
+type Proof = { requestId: string; recordId: string; filename: string };
+
+async function listAssignedProofs(pb: Pb, poId: string, driverId: string): Promise<Proof[]> {
+  const lines = await pb.collection("order_items").getFullList({
+    filter: pb.filter('purchase_order = {:poId} && drv_id = {:driverId} && item_status = "assigned"', { poId, driverId }),
+    fields: "id,order,supplier,payment_status,payment_request,order_item_attachements",
+  });
+  const paidLines = new Map(lines.filter((line) => line.payment_status === "paid" && line.payment_request).map((line) => [line.id, line]));
+  const requestIds = new Set([...paidLines.values()].map((line) => String(line.payment_request)));
+  const proofs = await Promise.all([...requestIds].map(async (id) => {
+    const request = await pb.collection("supplier_payment_requests").getOne<SupplierPaymentRequest>(id, {
+      fields: "id,status,order,supplier,items,documents",
+    }).catch((error: unknown) => {
+      if ((error as { status?: number } | null)?.status === 404) return null;
+      throw error;
+    });
+    if (request?.status !== "paid") return null;
+
+    const document = (request.documents ?? []).find((doc) => {
+      if (doc.role !== "proof" || doc.collection !== "order_items" || !request.items.includes(doc.recordId)) return false;
+      const line = paidLines.get(doc.recordId);
+      return line?.payment_request === id && line.order === request.order && line.supplier === request.supplier
+        && attachmentList(line.order_item_attachements).includes(doc.filename);
+    });
+    return document ? { requestId: request.id, recordId: document.recordId, filename: document.filename } : null;
+  }));
+  return proofs.filter((proof): proof is Proof => proof !== null);
+}
+
+export async function listDriverPaymentProofs(poId: string, driverId: string) {
+  return listAssignedProofs(await getAdminPocketBase(), poId, driverId);
+}
+
+export async function fetchDriverPaymentProof(poId: string, driverId: string, requestId: string) {
+  const pb = await getAdminPocketBase();
+  const proofs = await listAssignedProofs(pb, poId, driverId);
+  const proof = proofs.find((entry) => entry.requestId === requestId);
+  if (!proof) return null;
+
+  const token = await pb.files.getToken();
+  const url = pb.files.getURL({ collectionName: "order_items", id: proof.recordId }, proof.filename, { token });
+  const response = await fetch(url, { cache: "no-store" });
+  if (response.status === 404) return null;
+  if (!response.ok || !response.body) throw new Error("Could not open proof of payment.");
+
+  const type = (response.headers.get("content-type") ?? "").split(";")[0].toLowerCase();
+  const preview = /^(application\/pdf|image\/(jpeg|png|gif|webp|avif|bmp|heic|heif))$/.test(type);
+  return { body: response.body, contentType: preview ? type : "application/octet-stream" };
+}