diff --git a/scripts/generate-api-models.sh b/scripts/generate-api-models.sh
index d30e7400..d1660273 100755
--- a/scripts/generate-api-models.sh
+++ b/scripts/generate-api-models.sh
@@ -5,6 +5,8 @@ IO_BACKEND_VERSION=v17.5.2
 IO_SERVICES_METADATA_VERSION=1.0.93
 # Session manager version
 IO_SESSION_MANAGER_VERSION=1.8.0
+# Send Functions
+IO_SEND_FUNC=1.5.5
 
 declare -a noParams=(
   "./generated/definitions/backend https://raw.githubusercontent.com/pagopa/io-backend/$IO_BACKEND_VERSION/api_public.yaml"
@@ -31,7 +33,8 @@ declare -a noStrict=(
 )
 
 declare -a noStrictRequestTypesRespondeDecoders=(
-  "./generated/definitions/pn/aar https://raw.githubusercontent.com/pagopa/io-messages/send-func@1.4.1/apps/send-func/openapi/aar-notification.yaml"
+  "./generated/definitions/pn/aar https://raw.githubusercontent.com/pagopa/io-messages/send-func@$IO_SEND_FUNC/apps/send-func/openapi/aar-notification.yaml"
+  "./generated/definitions/pn/lollipopLambda https://raw.githubusercontent.com/pagopa/io-messages/send-func@$IO_SEND_FUNC/apps/send-func/openapi/lollipop-integration-check.yaml"
   "./generated/definitions/pn https://raw.githubusercontent.com/pagopa/io-backend/$IO_BACKEND_VERSION/api_pn.yaml"
   "./generated/definitions/trial_system https://raw.githubusercontent.com/pagopa/io-backend/$IO_BACKEND_VERSION/api_trial_system.yaml"
   "./generated/definitions/fims_history https://raw.githubusercontent.com/pagopa/io-backend/$IO_BACKEND_VERSION/api_io_fims.yaml"
diff --git a/src/config.ts b/src/config.ts
index 5c6110b1..4dc05eef 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -119,6 +119,7 @@ const defaultConfig: IoDevServerConfig = {
   send: {
     isServiceUpsertRateLimited: false,
     aarQRCodeUrl: "https://cittadini.notifichedigitali.it/io",
+    lollipopLambdaResponseCode: 200,
     mandateTimeToLiveSeconds: 120,
     paymentDocumentExpirationTimeSeconds: 10,
     paymentDocumentGenerationTimeSeconds: 3,
diff --git a/src/features/messages/routers/ioSendRouter.ts b/src/features/messages/routers/ioSendRouter.ts
index 0af297cd..eaf2995e 100644
--- a/src/features/messages/routers/ioSendRouter.ts
+++ b/src/features/messages/routers/ioSendRouter.ts
@@ -21,6 +21,7 @@ import {
 } from "../services/ioSendService";
 import MessagesService from "../services/messagesService";
 import { bodyToString } from "../utils";
+import { generateLollipopLambdaGetPath } from "../../pn/routers/lollipopLambda";
 
 export const ioSendRouter = Router();
 
@@ -163,21 +164,68 @@ addHandler(
   () => Math.random() * 500
 );
 
+addHandler(
+  ioSendRouter,
+  "get",
+  "/api/com/v1/send/lollipop-check/test",
+  lollipopMiddleware(async (req, res) => {
+    const sendLollipopLambdaGetUrl = `${serverUrl}${generateLollipopLambdaGetPath()}`;
+    commonHandleIsTestQueryParam(req);
+    const sendLollipopLambdaGetFetch = () =>
+      fetch(sendLollipopLambdaGetUrl, {
+        method: "get",
+        headers: generateRequestHeaders(req.headers, "application/json", true)
+      });
+    await fetchSENDDataAndForwardResponse(
+      sendLollipopLambdaGetFetch,
+      "lollipop-test",
+      res
+    );
+  }),
+  () => Math.random() * 500
+);
+
+addHandler(
+  ioSendRouter,
+  "post",
+  "/api/com/v1/send/lollipop-check/test",
+  lollipopMiddleware(async (req, res) => {
+    const sendLollipopLambdaPostUrl = `${serverUrl}${generateLollipopLambdaGetPath()}`;
+    const sendLollipopLambdaPostBodyEither = bodyToString(req.body);
+    if (handleLeftEitherIfNeeded(sendLollipopLambdaPostBodyEither, res)) {
+      return;
+    }
+    commonHandleIsTestQueryParam(req);
+    const sendLambdaLollipopPostFetch = () =>
+      fetch(sendLollipopLambdaPostUrl, {
+        method: "post",
+        headers: generateRequestHeaders(req.headers, "application/json", true),
+        body: sendLollipopLambdaPostBodyEither.right
+      });
+    await fetchSENDDataAndForwardResponse(
+      sendLambdaLollipopPostFetch,
+      "lollipop-test",
+      res
+    );
+  }),
+  () => Math.random() * 500
+);
+
 const fetchSENDDataAndForwardResponse = async (
   fetchFunction: () => Promise<globalThis.Response>,
   endpointName: string,
   res: Response
 ) => {
   try {
-    const sendQResponse = await fetchFunction();
+    const sendResponse = await fetchFunction();
 
-    const contentType = sendQResponse.headers.get("content-type");
-    const responseBodyBuffer = await sendQResponse.arrayBuffer();
+    const contentType = sendResponse.headers.get("content-type");
+    const responseBodyBuffer = await sendResponse.arrayBuffer();
     const body = Buffer.from(responseBodyBuffer);
     if (contentType) {
       res.setHeader("Content-Type", contentType);
     }
-    res.status(sendQResponse.status).send(body);
+    res.status(sendResponse.status).send(body);
   } catch (e) {
     const errorMessage = unknownToString(e);
     res
diff --git a/src/features/messages/services/ioSendService.ts b/src/features/messages/services/ioSendService.ts
index 590d7892..aa3e1424 100644
--- a/src/features/messages/services/ioSendService.ts
+++ b/src/features/messages/services/ioSendService.ts
@@ -29,16 +29,19 @@ export const isTestOrUndefinedFromQuery = (
 
 export const generateRequestHeaders = (
   headers: IncomingHttpHeaders,
-  contentType: string = "application/json"
+  contentType: string = "application/json",
+  excludeTaxId: boolean = false
 ): Record<string, string> => ({
   ...MessagesService.lollipopClientHeadersFromHeaders(headers),
   ...MessagesService.generateFakeLollipopServerHeaders(
     ioDevServerConfig.profile.attrs.fiscal_code
   ),
   ...MessagesService.sendAPIKeyHeader(),
-  ...MessagesService.sendTaxIdHeader(
-    ioDevServerConfig.profile.attrs.fiscal_code
-  ),
+  ...(excludeTaxId
+    ? {}
+    : MessagesService.sendTaxIdHeader(
+        ioDevServerConfig.profile.attrs.fiscal_code
+      )),
   "Content-Type": contentTypeHeaderFromHeaders(headers, contentType),
   ...ioSourceHeaderFromRequestHeaders(headers)
 });
diff --git a/src/features/pn/routers/lollipopLambda.ts b/src/features/pn/routers/lollipopLambda.ts
new file mode 100644
index 00000000..3e34fbe5
--- /dev/null
+++ b/src/features/pn/routers/lollipopLambda.ts
@@ -0,0 +1,69 @@
+import { Request, Response, Router } from "express";
+import { addHandler } from "../../../payloads/response";
+import { initializationMiddleware } from "../middlewares/initializationMiddleware";
+import { authenticationMiddleware } from "../middlewares/authenticationMiddleware";
+import { ioDevServerConfig } from "../../../config";
+import { handleLeftEitherIfNeeded } from "../../../utils/error";
+import { checkAndValidateLollipopHeaders } from "../services/lollipopService";
+import { lollipopLambdaResponseFromBodyAndConfig } from "../services/lollipopLambdaService";
+
+const lollipopLambdaPath = "/aws/send/lollipop-test";
+
+export const generateLollipopLambdaGetPath = () => lollipopLambdaPath;
+export const generateLollipopLambdaPostPath = () => lollipopLambdaPath;
+
+export const sendLollipopLambdaRouter = Router();
+
+addHandler(
+  sendLollipopLambdaRouter,
+  "get",
+  lollipopLambdaPath,
+  // Middleware have to be used like this (instead of directly giving the middleware to the router via use)
+  // because supertest (when testing) calls every middleware upon test initialization, even if it not in a
+  // router directly called by the test, thus making every test fail due to the authentication middleware
+  authenticationMiddleware(
+    initializationMiddleware((req, res) =>
+      commonLollipopLambdaHandling("GET", req, res)
+    )
+  )
+);
+
+addHandler(
+  sendLollipopLambdaRouter,
+  "post",
+  lollipopLambdaPath,
+  // Middleware have to be used like this (instead of directly giving the middleware to the router via use)
+  // because supertest (when testing) calls every middleware upon test initialization, even if it not in a
+  // router directly called by the test, thus making every test fail due to the authentication middleware
+  authenticationMiddleware(
+    initializationMiddleware((req, res) =>
+      commonLollipopLambdaHandling("POST", req, res)
+    )
+  )
+);
+
+const commonLollipopLambdaHandling = (
+  requestVerb: "GET" | "POST",
+  req: Request,
+  res: Response
+) => {
+  const sendConfig = ioDevServerConfig.send;
+  if (!sendConfig.skipLollipopVerification) {
+    const lollipopHeadersEither = checkAndValidateLollipopHeaders(req.headers);
+    if (handleLeftEitherIfNeeded(lollipopHeadersEither, res)) {
+      return;
+    }
+  }
+
+  const requestBody = requestVerb === "POST" ? req.body : undefined;
+  const lollipopLambdaGetResponseEither =
+    lollipopLambdaResponseFromBodyAndConfig(
+      requestVerb,
+      requestBody,
+      sendConfig
+    );
+  if (handleLeftEitherIfNeeded(lollipopLambdaGetResponseEither, res)) {
+    return;
+  }
+  res.status(200).json(lollipopLambdaGetResponseEither.right);
+};
diff --git a/src/features/pn/services/lollipopLambdaService.ts b/src/features/pn/services/lollipopLambdaService.ts
new file mode 100644
index 00000000..e3438d53
--- /dev/null
+++ b/src/features/pn/services/lollipopLambdaService.ts
@@ -0,0 +1,102 @@
+import { Either, isLeft, left } from "fp-ts/lib/Either";
+import { readableReportSimplified } from "@pagopa/ts-commons/lib/reporters";
+import { SendConfig } from "../types/sendConfig";
+import { ExpressFailure } from "../../../utils/expressDTO";
+import { SuccessResponse } from "../../../../generated/definitions/pn/lollipopLambda/SuccessResponse";
+import { getProblemJson } from "../../../payloads/error";
+import { ErrorResponse } from "../../../../generated/definitions/pn/lollipopLambda/ErrorResponse";
+
+export const lollipopLambdaResponseFromBodyAndConfig = (
+  requestVerb: "GET" | "POST",
+  requestBody: unknown,
+  sendConfig: SendConfig
+): Either<ExpressFailure, SuccessResponse> => {
+  const timestamp = new Date();
+  const statusCode = sendConfig.lollipopLambdaResponseCode ?? 200;
+  if (statusCode === 401) {
+    return left({
+      httpStatusCode: 401,
+      reason: {}
+    });
+  } else if (statusCode === 400 || statusCode === 403 || statusCode === 500) {
+    const errorResponseEither = ErrorResponse.decode({
+      success: false,
+      timestamp,
+      error: {
+        message: `Server was configured to send a ${statusCode} status code`,
+        statusCode
+      }
+    });
+    if (isLeft(errorResponseEither)) {
+      return left({
+        httpStatusCode: 500,
+        reason: getProblemJson(
+          500,
+          "Conversion to ErrorResponse failed",
+          `Unable to convert input data to the ErrorResponse data structure (${readableReportSimplified(
+            errorResponseEither.left
+          )})`
+        )
+      });
+    }
+    return left({
+      httpStatusCode: statusCode,
+      reason: errorResponseEither.right
+    });
+  }
+  const bodyStringOrUndefined = unknownBodyToStringOrUndefined(requestBody);
+  const bodyLengthOrUndefined = stringOrUndefinedToByteLengthOrUndefined(
+    bodyStringOrUndefined
+  );
+  const successResponseEither = SuccessResponse.decode({
+    success: true,
+    timestamp,
+    data: {
+      message: "Server was configured to send a 200 status code",
+      timestamp,
+      request: {
+        method: requestVerb,
+        path: "lollipop-test",
+        hasBody: !!bodyLengthOrUndefined,
+        bodyLength: bodyLengthOrUndefined ?? 0
+      }
+    }
+  });
+  if (isLeft(successResponseEither)) {
+    return left({
+      httpStatusCode: 500,
+      reason: getProblemJson(
+        500,
+        "Conversion to SuccessResponse failed",
+        `Unable to convert input data to the SuccessResponse data structure (${readableReportSimplified(
+          successResponseEither.left
+        )})`
+      )
+    });
+  }
+  return successResponseEither;
+};
+
+const stringOrUndefinedToByteLengthOrUndefined = (
+  input: string | undefined
+): number | undefined => (input ? Buffer.byteLength(input, "utf8") : undefined);
+
+const unknownBodyToStringOrUndefined = (body: unknown): string | undefined => {
+  if (typeof body === "string") {
+    return body;
+  } else if (typeof body === "object") {
+    try {
+      return JSON.stringify(body);
+    } catch {
+      return undefined;
+    }
+  } else if (
+    typeof body === "number" ||
+    (typeof BigInt !== "undefined" && typeof body === "bigint") ||
+    typeof body === "boolean" ||
+    typeof body === "symbol"
+  ) {
+    return String(body);
+  }
+  return undefined;
+};
diff --git a/src/features/pn/types/sendConfig.ts b/src/features/pn/types/sendConfig.ts
index b5e58fa0..d9ab8a2d 100644
--- a/src/features/pn/types/sendConfig.ts
+++ b/src/features/pn/types/sendConfig.ts
@@ -71,6 +71,13 @@ export const SendConfig = t.intersection([
   }),
   t.partial({
     aarQRCodeUrl: t.string,
+    lollipopLambdaResponseCode: t.union([
+      t.literal(200),
+      t.literal(400),
+      t.literal(401),
+      t.literal(403),
+      t.literal(500)
+    ]),
     mandateTimeToLiveSeconds: t.number,
     paymentDocumentExpirationTimeSeconds: t.number,
     paymentDocumentGenerationTimeSeconds: t.number,
diff --git a/src/server.ts b/src/server.ts
index a2fed89c..583336b5 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -44,6 +44,7 @@ import { sendServiceRouter } from "./features/pn/routers/serviceRouter";
 import { sendMandatesRouter } from "./features/pn/routers/mandatesRouter";
 import { ioSendRouter } from "./features/messages/routers/ioSendRouter";
 import { cdcRouter } from "./features/cdc/routers";
+import { sendLollipopLambdaRouter } from "./features/pn/routers/lollipopLambda";
 
 // create express server
 const app: Application = express();
@@ -87,6 +88,7 @@ app.use(fastLoginMiddleware);
   fciRouter,
   sendAARRouter,
   sendDocumentsRouter,
+  sendLollipopLambdaRouter,
   sendMandatesRouter,
   sendNotificationsRouter,
   sendPrevalidatedUrisRouter,