diff --git a/src/app/api/v1/driver/invoice-match/route.test.ts b/src/app/api/v1/driver/invoice-match/route.test.ts
new file mode 100644
index 0000000..2c21041
--- /dev/null
+++ b/src/app/api/v1/driver/invoice-match/route.test.ts
@@ -0,0 +1,52 @@
+import { describe, it, expect, beforeEach, vi } from "vitest";
+import { NextRequest } from "next/server";
+
+const matchInvoiceToDriverLines = vi.fn();
+vi.mock("@/lib/server/collection-ai-service", () => ({
+  matchInvoiceToDriverLines: (...a: unknown[]) => matchInvoiceToDriverLines(...a),
+  COLLECTION_AI_NOT_SET_UP_ERROR: "not set up",
+  COLLECTION_AI_DISABLED_ERROR: "AI is disabled in settings",
+}));
+const getBrowserSessionUser = vi.fn();
+vi.mock("@/lib/server/browser-session", () => ({
+  getBrowserSessionUser: (...a: unknown[]) => getBrowserSessionUser(...a),
+}));
+
+import { POST, OPTIONS } from "./route";
+
+const req = (body?: unknown) =>
+  new NextRequest("http://localhost/api/v1/driver/invoice-match", {
+    method: "POST",
+    headers: { authorization: "Bearer t", "content-type": "application/json" },
+    body: body === undefined ? undefined : JSON.stringify(body),
+  });
+
+beforeEach(() => {
+  vi.clearAllMocks();
+  getBrowserSessionUser.mockResolvedValue({ id: "d1", user_type: null, name: "Driver" });
+});
+
+describe("POST /api/v1/driver/invoice-match", () => {
+  it("answers the CORS preflight", () => {
+    expect(OPTIONS().status).toBe(204);
+  });
+  it("401s without a session", async () => {
+    getBrowserSessionUser.mockRejectedValue(Object.assign(new Error("no"), { status: 401 }));
+    const res = await POST(req({ po_number: "PO1" }));
+    expect(res.status).toBe(401);
+    expect(matchInvoiceToDriverLines).not.toHaveBeenCalled();
+  });
+  it("400s without po_number", async () => {
+    expect((await POST(req({}))).status).toBe(400);
+  });
+  it("409s when AI is disabled", async () => {
+    matchInvoiceToDriverLines.mockResolvedValue({ error: "AI is disabled in settings" });
+    expect((await POST(req({ po_number: "PO1" }))).status).toBe(409);
+  });
+  it("matches for the signed-in driver only", async () => {
+    matchInvoiceToDriverLines.mockResolvedValue({ po_number: "PO1", matched: [], review: [], error: "" });
+    const res = await POST(req({ po_number: " PO1 " }));
+    expect(res.status).toBe(200);
+    expect(matchInvoiceToDriverLines).toHaveBeenCalledWith("PO1", "d1");
+  });
+});
diff --git a/src/app/api/v1/driver/invoice-match/route.ts b/src/app/api/v1/driver/invoice-match/route.ts
new file mode 100644
index 0000000..11ce878
--- /dev/null
+++ b/src/app/api/v1/driver/invoice-match/route.ts
@@ -0,0 +1,61 @@
+import { NextRequest, NextResponse } from "next/server";
+import { getBrowserSessionUser } from "@/lib/server/browser-session";
+import {
+  matchInvoiceToDriverLines,
+  COLLECTION_AI_DISABLED_ERROR,
+  COLLECTION_AI_NOT_SET_UP_ERROR,
+} from "@/lib/server/collection-ai-service";
+
+/**
+ * POST /api/v1/driver/invoice-match
+ *
+ * The driver photographed a supplier invoice on a PO. Body:
+ * `{ po_number: string }`. Reads the photo(s) and compares them with every
+ * line assigned to THIS driver at the same supplier. Returns `matched` (same
+ * product, invoice quantity = ordered quantity: safe to mark collected) and
+ * `review` (probably on the invoice but uncertain or a different quantity).
+ *
+ * Read-only for the order/stock lines: the driver app does the collecting
+ * through its normal write path. Auth: the driver's PocketBase token.
+ * CORS is open because the PWA is on its own origin and uses a bearer token.
+ */
+export const runtime = "nodejs";
+export const dynamic = "force-dynamic";
+export const maxDuration = 120;
+
+const CORS = {
+  "Access-Control-Allow-Origin": "*",
+  "Access-Control-Allow-Methods": "POST, OPTIONS",
+  "Access-Control-Allow-Headers": "Authorization, Content-Type",
+  "Access-Control-Max-Age": "86400",
+};
+
+function json(body: unknown, status = 200) {
+  return NextResponse.json(body, { status, headers: CORS });
+}
+
+export function OPTIONS() {
+  return new NextResponse(null, { status: 204, headers: CORS });
+}
+
+export async function POST(req: NextRequest) {
+  try {
+    const user = await getBrowserSessionUser(req);
+    const body = (await req.json().catch(() => ({}))) as { po_number?: unknown };
+    const poNumber = typeof body.po_number === "string" ? body.po_number.trim() : "";
+    if (!poNumber) return json({ error: "po_number is required" }, 400);
+
+    const result = await matchInvoiceToDriverLines(poNumber, user.id);
+    if (
+      result.error === COLLECTION_AI_NOT_SET_UP_ERROR ||
+      result.error === COLLECTION_AI_DISABLED_ERROR
+    ) {
+      return json({ error: result.error }, 409);
+    }
+    return json(result);
+  } catch (err) {
+    const message = err instanceof Error ? err.message : "Invoice match failed";
+    const status = (err as Error & { status?: number }).status || 500;
+    return json({ error: message }, status);
+  }
+}
diff --git a/src/lib/server/collection-ai-service.ts b/src/lib/server/collection-ai-service.ts
index e8fa5c1..96e367a 100644
--- a/src/lib/server/collection-ai-service.ts
+++ b/src/lib/server/collection-ai-service.ts
@@ -1094,3 +1094,245 @@ export async function loadCardLineChecks(poNumber: string): Promise<CardLineChec
     ai_check: l.ai_check,
   }));
 }
+
+// ─── Invoice → driver's assigned lines (pre-collection match) ───────
+
+export interface InvoiceMatchLine {
+  id: string;
+  kind: "customer" | "stock";
+  po_number: string;
+  description: string;
+  /** Quantity on the invoice (equals the ordered quantity for a match). */
+  quantity: number;
+  /** What the row looked like before, so the driver app can undo. */
+  previous: Record<string, unknown>;
+}
+
+export interface InvoiceMatchReview {
+  id: string;
+  kind: "customer" | "stock";
+  po_number: string;
+  description: string;
+  reason: string;
+}
+
+export interface InvoiceMatchResult {
+  po_number: string;
+  files_read: number;
+  /** Exact matches: same product ("sure") and invoice quantity = ordered quantity. */
+  matched: InvoiceMatchLine[];
+  /** Probably on the invoice, but not certain or the quantity differs: the driver decides. */
+  review: InvoiceMatchReview[];
+  error: string;
+}
+
+const MATCH_MAX_FILES = 6;
+
+/**
+ * Compare the invoice photo(s) on a PO with every line assigned to THIS
+ * driver at the same supplier. Read-only for the lines: it only caches the
+ * photo reads (like the Confirm check) and returns what matched; the driver
+ * app does the collecting through its normal write path.
+ */
+export async function matchInvoiceToDriverLines(
+  poNumber: string,
+  driverId: string,
+  opts: { deps?: CollectionAiDeps } = {},
+): Promise<InvoiceMatchResult> {
+  const deps = opts.deps ?? {};
+  const readDocument = deps.readDocument ?? readDocumentImage;
+  const pairLines = deps.pairLines ?? pairDocumentLines;
+  const fetchFile = deps.fetchFile ?? defaultFetchFile;
+  const rotateImage = deps.rotateImage ?? defaultRotateImage;
+  const now = (deps.now ?? (() => new Date()))();
+  const result: InvoiceMatchResult = { po_number: poNumber, files_read: 0, matched: [], review: [], error: "" };
+
+  return runWithAuditActor({ name: ACTOR_NAME, source: "agent", ignoreRequestUser: true }, async () => {
+    const pb = await getAdminPocketBase();
+    const settings = await getAiSettings();
+    if (!settings.enabled) {
+      result.error = COLLECTION_AI_DISABLED_ERROR;
+      return result;
+    }
+
+    // 1. The PO the photo is on, and the photos on it.
+    const [custPos, stockPos] = await Promise.all([
+      pb.collection(CUSTOMER_POS).getFullList<Rec>({ filter: `po_number = "${q(poNumber)}"` }),
+      pb.collection(STOCK_POS).getFullList<Rec>({ filter: `purchase_number = "${q(poNumber)}"` }),
+    ]);
+    const cardPos = [...custPos.map((r) => toPoRef("customer", r)), ...stockPos.map((r) => toPoRef("stock", r))];
+    if (cardPos.length === 0) {
+      result.error = `PO ${poNumber} not found`;
+      return result;
+    }
+    const stockPurchases = new Map(stockPos.map((r) => [r.id, r]));
+    const cardLines = await loadLinesForPos(pb, cardPos, false);
+    const files = filesForLines(cardLines, stockPurchases).filter((f) => IMAGE_EXT.has(ext(f.filename)));
+    if (files.length === 0) return result;
+
+    // 2. Read each photo once (cached by content hash, as in the Confirm check).
+    const readsByFile = await loadReadsForFiles(pb, files);
+    const wanted = new Set(cardPos.map((p) => normalizePoReference(p.po_number)));
+    const docsByHash = new Map<string, CollectionDocRead>();
+    for (const file of files) {
+      let read = readsByFile.get(fileKey(file));
+      if (!read || read.status === "failed" || read.status === "skipped") {
+        if (result.files_read >= MATCH_MAX_FILES) continue;
+        let fetched: Awaited<ReturnType<typeof fetchFile>>;
+        try {
+          fetched = await fetchFile({ collection: file.collection, id: file.id }, file.filename);
+        } catch (e) {
+          if (!result.error) result.error = `${file.filename}: ${errMessage(e)}`;
+          continue;
+        }
+        const hash = createHash("sha256").update(fetched.bytes).digest("hex");
+        const known = await findReadByHash(pb, hash);
+        let fields: ReadFields;
+        if (known) {
+          const rest: Partial<CollectionDocRead> = { ...known };
+          delete rest.id;
+          fields = copyOf(file, rest as ReadFields);
+        } else {
+          try {
+            let r = await readDocument({ base64: fetched.base64, contentType: fetched.contentType });
+            // Sideways photos: retry turned when it names none of this PO's numbers.
+            if (r.doc_type !== "other" && !r.po_refs.some((ref) => wanted.has(normalizePoReference(ref)))) {
+              for (const angle of RETRY_ROTATIONS) {
+                try {
+                  const turned = await readDocument(await rotateImage(fetched.bytes, angle));
+                  if (turned.po_refs.some((ref) => wanted.has(normalizePoReference(ref)))) {
+                    r = { ...turned, notes: [...turned.notes, `Read with the photo turned ${angle}°.`] };
+                    break;
+                  }
+                } catch (e) {
+                  if (e instanceof AiDisabledError) throw e;
+                }
+              }
+            }
+            fields = fromResult(file, hash, r, now);
+            result.files_read += 1;
+          } catch (e) {
+            if (e instanceof AiDisabledError) {
+              result.error = COLLECTION_AI_DISABLED_ERROR;
+              return result;
+            }
+            if (!result.error) result.error = `read failed for ${file.filename}: ${errMessage(e)}`;
+            continue;
+          }
+        }
+        try {
+          const existing = readsByFile.get(fileKey(file));
+          const saved = existing
+            ? await pb.collection(READS).update<Rec>(existing.id, fields)
+            : await pb.collection(READS).create<Rec>(fields);
+          read = toRead(saved);
+        } catch (e) {
+          if (!result.error) result.error = `saving the read of ${file.filename} failed: ${errMessage(e)}`;
+          continue;
+        }
+      }
+      if (read.status !== "read") continue;
+      if (read.doc_type !== "tax_invoice" && read.doc_type !== "delivery_note") continue;
+      const key = read.content_hash || read.id;
+      const prev = docsByHash.get(key);
+      if (!prev || newer(prev, read)) docsByHash.set(key, read);
+    }
+    const docs = [...docsByHash.values()];
+    if (docs.length === 0) return result;
+
+    // 3. Everything assigned to this driver at the same supplier(s).
+    const suppliers = [...new Set(cardPos.map((p) => p.supplier).filter(Boolean))];
+    if (suppliers.length === 0) return result;
+    const orderItems = getOrderItemsCollectionName();
+    const custRecs: Rec[] = [];
+    const stockRecs: Rec[] = [];
+    for (const s of suppliers) {
+      custRecs.push(
+        ...(await pb.collection(orderItems).getFullList<Rec>({
+          filter: `drv_id = "${q(driverId)}" && item_status = "assigned" && purchase_order.supplier = "${q(s)}"`,
+        })),
+      );
+      stockRecs.push(
+        ...(await pb.collection(STOCK_LINES).getFullList<Rec>({
+          filter: `drv_id = "${q(driverId)}" && status = "assigned_to_driver" && purchase.supplier = "${q(s)}"`,
+        })),
+      );
+    }
+    if (custRecs.length === 0 && stockRecs.length === 0) return result;
+    const poRows = [
+      ...(await listByField(pb, CUSTOMER_POS, "id", custRecs.map((r) => str(r.purchase_order)))).map((r) => toPoRef("customer", r)),
+      ...(await listByField(pb, STOCK_POS, "id", stockRecs.map((r) => str(r.purchase)))).map((r) => toPoRef("stock", r)),
+    ];
+    const poById = new Map(poRows.map((p) => [`${p.kind}:${p.id}`, p]));
+    const candidates: Line[] = [
+      ...custRecs.map((r) => customerLine(r, poById.get(`customer:${str(r.purchase_order)}`), orderItems)),
+      ...stockRecs.map((r) => stockLine(r, poById.get(`stock:${str(r.purchase)}`))),
+    ];
+    const recById = new Map([...custRecs, ...stockRecs].map((r) => [r.id, r]));
+    const pairInput: PairPoLine[] = candidates.map((l) => ({
+      id: l.id,
+      po_number: l.poNumber,
+      description: l.description,
+      collected: false,
+      order_qty: l.order_qty,
+      quantity: l.quantity,
+      qty_collected: l.qty_collected,
+      sku: l.sku,
+      po_description: l.po_description,
+      cost_price: l.cost_price,
+      status: l.status,
+    }));
+    const byId = new Map(candidates.map((l) => [l.id, l]));
+
+    // 4. Pair, then decide. A line is matched once, by its first document.
+    const decided = new Set<string>();
+    for (const doc of docs) {
+      let paired: Awaited<ReturnType<typeof pairLines>>;
+      try {
+        paired = await pairLines(doc.lines, pairInput);
+      } catch (e) {
+        if (e instanceof AiDisabledError) {
+          result.error = COLLECTION_AI_DISABLED_ERROR;
+          return result;
+        }
+        if (!result.error) result.error = `pairing failed: ${errMessage(e)}`;
+        continue;
+      }
+      const docLineByNo = new Map(doc.lines.map((d) => [d.line_no, d]));
+      for (const decision of paired.pairs.values()) {
+        const line = decision.po_line_id ? byId.get(decision.po_line_id) : undefined;
+        const docLine = docLineByNo.get(decision.doc_line_no);
+        if (!line || !docLine || decided.has(line.id) || !isRealPair(decision.same_item)) continue;
+        decided.add(line.id);
+        const ordered = line.order_qty ? line.order_qty : line.quantity;
+        const base = { id: line.id, kind: line.kind, po_number: line.poNumber, description: line.description };
+        if (decision.same_item === "sure" && docLine.quantity != null && docLine.quantity === ordered) {
+          const rec = recById.get(line.id)!;
+          result.matched.push({
+            ...base,
+            quantity: docLine.quantity,
+            previous:
+              line.kind === "customer"
+                ? {
+                    item_status: str(rec.item_status),
+                    drv_status: str(rec.drv_status),
+                    drv_collected_at: str(rec.drv_collected_at),
+                    collected_date: str(rec.collected_date),
+                    qty_collected: num(rec.qty_collected),
+                  }
+                : { status: str(rec.status), quantity_received: num(rec.quantity_received) },
+          });
+        } else {
+          const reason =
+            docLine.quantity == null
+              ? "Couldn't read the quantity on the invoice."
+              : docLine.quantity !== ordered
+                ? `Invoice says ${docLine.quantity}, ordered ${ordered}.`
+                : "Looks like the same item, but not certain.";
+          result.review.push({ ...base, reason });
+        }
+      }
+    }
+    return result;
+  });
+}