diff --git a/.env.example b/.env.example
index 2db4b3b..cf3e1e9 100644
--- a/.env.example
+++ b/.env.example
@@ -72,4 +72,6 @@ APPCENTER_BUILD_ID=1
 ENFServerUrl=
 
 # Google's SafetynetKey for Device Attestation API
-SafetynetKey=
\ No newline at end of file
+SafetynetKey=
+
+ENFCheckInterval=
\ No newline at end of file
diff --git a/ios/Podfile.lock b/ios/Podfile.lock
index e07f371..28b2817 100644
--- a/ios/Podfile.lock
+++ b/ios/Podfile.lock
@@ -276,7 +276,7 @@ PODS:
     - react-native-config/App (= 1.3.3)
   - react-native-config/App (1.3.3):
     - React
-  - react-native-exposure-notification-service (1.1.44):
+  - react-native-exposure-notification-service (1.2.6):
     - Alamofire (~> 5.2)
     - KeychainSwift (~> 19.0)
     - React
@@ -450,7 +450,7 @@ DEPENDENCIES:
   - Yoga (from `../node_modules/react-native/ReactCommon/yoga`)
 
 SPEC REPOS:
-  https://cdn.cocoapods.org/:
+  trunk:
     - Alamofire
     - AppCenter
     - AppCenterReactNativeShared
@@ -620,7 +620,7 @@ SPEC CHECKSUMS:
   React-jsinspector: b14e62ebe7a66e9231e9581279909f2fc3db6606
   react-native-camera: 35854c4f764a4a6cf61c1c3525888b92f0fe4b31
   react-native-config: 9a061347e0136fdb32d43a34d60999297d672361
-  react-native-exposure-notification-service: 32ca3fa42976b518bf0a8e2b0bf16810d75e41b9
+  react-native-exposure-notification-service: bc9fe5ece6048ac6eca17f5649367014a6bfbfc2
   react-native-netinfo: 250dc0ca126512f618a8a2ca6a936577e1f66586
   react-native-safe-area-context: 955ecfce672683b495d9294d2f154a9ad1d9796b
   react-native-splash-screen: 200d11d188e2e78cea3ad319964f6142b6384865
@@ -657,4 +657,4 @@ SPEC CHECKSUMS:
 
 PODFILE CHECKSUM: 9a46cbeb408836d3fa898d9ed314381af73a92d1
 
-COCOAPODS: 1.9.3
+COCOAPODS: 1.10.1
diff --git a/package.json b/package.json
index ceb98ee..e571695 100644
--- a/package.json
+++ b/package.json
@@ -57,7 +57,7 @@
     "react-native-config": "^1.3.3",
     "react-native-country-picker-modal": "^2.0.0",
     "react-native-device-info": "^6.0.2",
-    "react-native-exposure-notification-service": "^1.1.44",
+    "react-native-exposure-notification-service": "1.2.6",
     "react-native-gesture-handler": "^1.8.0",
     "react-native-google-safetynet": "^1.0.0",
     "react-native-haptic-feedback": "^1.11.0",
diff --git a/scripts/setenv.sh b/scripts/setenv.sh
index ed9cfb9..447442b 100755
--- a/scripts/setenv.sh
+++ b/scripts/setenv.sh
@@ -25,6 +25,7 @@ echo "APP_VERSION=${APP_VERSION}" >>.env
 echo "APPCENTER_BUILD_ID=${APPCENTER_BUILD_ID}" >>.env
 echo "ENFServerUrl=${ENFServerUrl}" >>.env
 echo "SafetynetKey=${SafetynetKey}" >>.env
+echo "ENFCheckInterval=${ENFCheckInterval}" >>.env
 
 
 printf "\n.env created with contents:\n"
diff --git a/src/__snapshots__/config.spec.ts.snap b/src/__snapshots__/config.spec.ts.snap
index 3c05c75..771e9d4 100644
--- a/src/__snapshots__/config.spec.ts.snap
+++ b/src/__snapshots__/config.spec.ts.snap
@@ -18,6 +18,7 @@ Object {
   "ContactAlertsUrl": "https://www.health.govt.nz/nz-covid-tracer-contact-alerts",
   "ContactUsPageUrl": "https://www.health.govt.nz/our-work/diseases-and-conditions/covid-19-novel-coronavirus/covid-19-resources-and-tools/nz-covid-tracer-app/contact-nz-covid-tracer",
   "DbEncryptionKey": "",
+  "ENFCheckInterval": 180,
   "ENFServerUrl": "",
   "ExposureEventsBaseUrl": "https://exposure-events.",
   "Features": Set {},
diff --git a/src/config.ts b/src/config.ts
index 582c030..0211939 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -32,6 +32,7 @@ export interface AppConfigRaw {
   ANDROID_VERSION_CODE_OFFSET?: string;
   ENFServerUrl?: string;
   SafetynetKey?: string;
+  ENFCheckInterval?: string;
 }
 
 export interface AppConfig {
@@ -65,6 +66,7 @@ export interface AppConfig {
   APPCENTER_BUILD_ID: string;
   ENFServerUrl: string;
   SafetynetKey: string;
+  ENFCheckInterval: number;
 }
 
 export let disableAnimations = false;
@@ -119,6 +121,16 @@ export const getBuildId = (offset?: string, buildId?: string) => {
 
 export { buildUrl as _buildUrl };
 
+const getENFCheckInterval = () => {
+  if (raw.ENFCheckInterval) {
+    const parsed = parseInt(raw.ENFCheckInterval);
+    if (!isNaN(parsed)) {
+      return Math.max(15, parsed);
+    }
+  }
+  return 180;
+};
+
 const config: AppConfig = {
   APIServiceAddress: raw.APIServiceAddress || "",
   AppAddress: raw.AppAddress || "",
@@ -169,6 +181,7 @@ const config: AppConfig = {
   ),
   ENFServerUrl: raw.ENFServerUrl || "",
   SafetynetKey: raw.SafetynetKey || "",
+  ENFCheckInterval: getENFCheckInterval(),
 };
 
 export default config;
diff --git a/src/features/debugging/commands/enfCheckExposure.ts b/src/features/debugging/commands/enfCheckExposure.ts
index 0a177c7..f36bbbd 100644
--- a/src/features/debugging/commands/enfCheckExposure.ts
+++ b/src/features/debugging/commands/enfCheckExposure.ts
@@ -9,7 +9,7 @@ export const enfCheckExposure = (
   title: "Check Exposure",
   async run() {
     const { checkExposure } = exposure;
-    checkExposure(true, false);
+    checkExposure(false);
     Alert.alert("checkExposure", "Done");
   },
 });
diff --git a/src/features/debugging/commands/enfContacts.ts b/src/features/debugging/commands/enfContacts.ts
index ddb69e6..a51c8e8 100644
--- a/src/features/debugging/commands/enfContacts.ts
+++ b/src/features/debugging/commands/enfContacts.ts
@@ -11,7 +11,7 @@ export const enfContacts = (exposure: ExposureContextValue): TestCommand => ({
     const contacts = await getCloseContacts();
 
     const latestExposureDate = contacts?.reduce<number>((max, contact) => {
-      const exposureDate = moment(parseInt(contact.exposureAlertDate, 10))
+      const exposureDate = moment(contact.exposureAlertDate)
         .subtract(contact.daysSinceLastExposure, "days")
         .valueOf();
       return max > exposureDate ? max : exposureDate;
@@ -21,12 +21,12 @@ export const enfContacts = (exposure: ExposureContextValue): TestCommand => ({
       (acc, contact, ix, array) =>
         acc
           .concat(
-            `Alert date: ${moment(
-              parseInt(contact.exposureAlertDate, 10),
-            ).format("DD MMM HH:mm")}`,
+            `Alert date: ${moment(contact.exposureAlertDate).format(
+              "DD MMM HH:mm",
+            )}`,
           )
           .concat(
-            `\nExposure date: ${moment(parseInt(contact.exposureAlertDate, 10))
+            `\nExposure date: ${moment(contact.exposureAlertDate)
               .subtract(contact.daysSinceLastExposure, "days")
               .format("DD MMM HH:mm")}`,
           )
diff --git a/src/features/debugging/commands/enfSimulateExposure.ts b/src/features/debugging/commands/enfSimulateExposure.ts
index b34151a..d7bde94 100644
--- a/src/features/debugging/commands/enfSimulateExposure.ts
+++ b/src/features/debugging/commands/enfSimulateExposure.ts
@@ -18,6 +18,6 @@ export const enfSimulateExposure = (
         return;
       }
     }
-    exposure.simulateExposure(0);
+    exposure.simulateExposure(0, 0);
   },
 });
diff --git a/src/features/enf/components/ExposureProvider.tsx b/src/features/enf/components/ExposureProvider.tsx
index 9f9e4d7..6739c43 100644
--- a/src/features/enf/components/ExposureProvider.tsx
+++ b/src/features/enf/components/ExposureProvider.tsx
@@ -27,7 +27,7 @@ export function ExposureProvider(props: ExposureProviderProps) {
     keyServerUrl: config.ENFServerUrl,
     keyServerType: KeyServerType.nearform,
     traceConfiguration: {
-      exposureCheckInterval: 180,
+      exposureCheckInterval: config.ENFCheckInterval,
       storeExposuresFor: 14,
       fileLimit: 1,
       fileLimitiOS: 3,
diff --git a/src/features/enfExposure/analytics.ts b/src/features/enfExposure/analytics.ts
index c6dcbf9..6480909 100644
--- a/src/features/enfExposure/analytics.ts
+++ b/src/features/enfExposure/analytics.ts
@@ -16,9 +16,7 @@ export const recordDismissENFAlert = (enfAlert: ENFAlertData) => {
 export const recordDisplayENFAlert = (match: CloseContact) => {
   recordAnalyticEvent(ENFEvent.ENFBannerDisplayed, {
     attributes: {
-      alertDate: moment(parseInt(match.exposureAlertDate, 10)).format(
-        "DD MMM YYYY",
-      ),
+      alertDate: moment(match.exposureAlertDate).format("DD MMM YYYY"),
     },
     metrics: {
       riskScore: match.maxRiskScore,
diff --git a/src/features/enfExposure/sagas/updateENFAlert.spec.ts b/src/features/enfExposure/sagas/updateENFAlert.spec.ts
index a650513..3f26ac6 100644
--- a/src/features/enfExposure/sagas/updateENFAlert.spec.ts
+++ b/src/features/enfExposure/sagas/updateENFAlert.spec.ts
@@ -13,29 +13,33 @@ import {
 import updateENFAlert from "./updateENFAlert";
 
 const CONTACT1: CloseContact = {
-  exposureAlertDate: moment("2020-11-10T00:00:00.000Z").valueOf().toString(),
+  exposureAlertDate: moment("2020-11-10T00:00:00.000Z").valueOf(),
   daysSinceLastExposure: 2,
   attenuationDurations: [],
   matchedKeyCount: 1,
   maxRiskScore: 10,
-  summationRiskScore: 10,
+  riskScoreSumFullRange: 10,
+  maxRiskScoreFullRange: 10,
+  exposureDate: moment("2020-11-10T00:00:00.000Z").valueOf(),
 };
 
 // the most recent exposure date, alert date is between contact1 and 3
-const CONTACT2 = {
+const CONTACT2: CloseContact = {
   maxRiskScore: 120,
-  exposureAlertDate: moment("2020-11-15T00:00:00.000Z").valueOf().toString(),
+  exposureAlertDate: moment("2020-11-15T00:00:00.000Z").valueOf(),
   daysSinceLastExposure: 2,
   attenuationDurations: [],
   matchedKeyCount: 1,
-  summationRiskScore: 120,
+  riskScoreSumFullRange: 120,
+  maxRiskScoreFullRange: 120,
+  exposureDate: moment("2020-11-15T00:00:00.000Z").valueOf(),
 };
 
 // this one has the most recent alert date, but not recent exposure date
-const CONTACT3 = {
+const CONTACT3: CloseContact = {
   ...CONTACT1,
   maxRiskScore: 10,
-  exposureAlertDate: moment("2020-11-20T00:00:00.000Z").valueOf().toString(),
+  exposureAlertDate: moment("2020-11-20T00:00:00.000Z").valueOf(),
   daysSinceLastExposure: 10,
   matchedKeyCount: 2,
 };
@@ -47,8 +51,8 @@ const RESULT_FROM_CONTACT1_BUCKET0: ENFAlertData = {
   alertTitle: enfConfig[0].alertTitle,
   alertMessage: enfConfig[0].alertMessage,
   linkUrl: enfConfig[0].linkUrl,
-  alertDate: parseInt(CONTACT1.exposureAlertDate, 10),
-  exposureDate: moment(parseInt(CONTACT1.exposureAlertDate, 10))
+  alertDate: CONTACT1.exposureAlertDate,
+  exposureDate: moment(CONTACT1.exposureAlertDate)
     .subtract(CONTACT1.daysSinceLastExposure, "days")
     .valueOf(),
   exposureCount: 1,
@@ -58,8 +62,8 @@ const RESULT_FROM_CONTACT2_BUCKET2: ENFAlertData = {
   alertTitle: enfConfig[2].alertTitle,
   alertMessage: enfConfig[2].alertMessage,
   linkUrl: enfConfig[2].linkUrl,
-  alertDate: parseInt(CONTACT2.exposureAlertDate, 10),
-  exposureDate: moment(parseInt(CONTACT2.exposureAlertDate, 10))
+  alertDate: CONTACT2.exposureAlertDate,
+  exposureDate: moment(CONTACT2.exposureAlertDate)
     .subtract(CONTACT2.daysSinceLastExposure, "days")
     .valueOf(),
   exposureCount: 1,
@@ -69,8 +73,8 @@ const RESULT_FROM_CONTACT2_BUCKET2_1: ENFAlertData = {
   alertTitle: enfConfig[2].alertTitle,
   alertMessage: enfConfig[2].alertMessage,
   linkUrl: enfConfig[2].linkUrl,
-  alertDate: parseInt(CONTACT2.exposureAlertDate, 10),
-  exposureDate: moment(parseInt(CONTACT2.exposureAlertDate, 10))
+  alertDate: CONTACT2.exposureAlertDate,
+  exposureDate: moment(CONTACT2.exposureAlertDate)
     .subtract(CONTACT2.daysSinceLastExposure, "days")
     .valueOf(),
   exposureCount: 3,
diff --git a/src/features/enfExposure/sagas/updateENFAlert.ts b/src/features/enfExposure/sagas/updateENFAlert.ts
index d0ba28e..d5147c0 100644
--- a/src/features/enfExposure/sagas/updateENFAlert.ts
+++ b/src/features/enfExposure/sagas/updateENFAlert.ts
@@ -43,12 +43,12 @@ export default function* updateENFAlert(
     const match = contacts.reduce<CloseContact | undefined>(
       (current, contact) => {
         const currentExposureDate = current
-          ? moment(parseInt(contact.exposureAlertDate, 10))
+          ? moment(contact.exposureAlertDate)
               .subtract(contact.daysSinceLastExposure, "days")
               .valueOf()
           : 0;
 
-        const exposureDate = moment(parseInt(contact.exposureAlertDate, 10))
+        const exposureDate = moment(contact.exposureAlertDate)
           .subtract(contact.daysSinceLastExposure, "days")
           .valueOf();
 
@@ -87,7 +87,7 @@ export default function* updateENFAlert(
       return;
     }
 
-    const alertDate = parseInt(match.exposureAlertDate, 10);
+    const alertDate = match.exposureAlertDate;
 
     const result: ENFAlertData = {
       exposureCount,
diff --git a/src/features/scan/views/Scan.tsx b/src/features/scan/views/Scan.tsx
index 3a3a119..6837e55 100644
--- a/src/features/scan/views/Scan.tsx
+++ b/src/features/scan/views/Scan.tsx
@@ -371,28 +371,23 @@ export function Scan(props: Props) {
     [canScanBarcode, currentUserId, isFocused, saveEntryAsync, showError, t],
   );
 
+  const appState = useAppState();
+
   const showCamera = useMemo(
-    () => isCameraMounted && cameraPermission === "granted",
-    [isCameraMounted, cameraPermission],
+    () =>
+      appState !== "background" &&
+      isCameraMounted &&
+      cameraPermission === "granted",
+    [isCameraMounted, cameraPermission, appState],
   );
 
-  const appState = useAppState();
-
   useEffect(() => {
-    if (cameraRef.current == null) {
-      return;
-    }
-    switch (appState) {
-      case "background":
-        logInfo("pause preview");
-        cameraRef.current.pausePreview();
-        break;
-      case "active":
-        logInfo("resume preview");
-        cameraRef.current.resumePreview();
-        break;
+    if (showCamera) {
+      logInfo("show camera");
+    } else {
+      logInfo("hide camera");
     }
-  }, [appState]);
+  }, [showCamera]);
 
   useAccessibleTitle();
 
diff --git a/yarn.lock b/yarn.lock
index e6e1577..104992d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -9387,10 +9387,10 @@ react-native-device-info@^6.0.2:
   resolved "https://registry.yarnpkg.com/react-native-device-info/-/react-native-device-info-6.2.1.tgz#6b63faeef833d8959d636c0413ccd5066eada2bf"
   integrity sha512-+9Li07jD+7IiSIn9VVmb1YWYfJtgERVMsgO/hG+aUzsFD6uFklpM2TOEBlfKPWP/8J6s8MZgpGfA/Dl1WZrn2g==
 
-react-native-exposure-notification-service@^1.1.44:
-  version "1.1.44"
-  resolved "https://registry.yarnpkg.com/react-native-exposure-notification-service/-/react-native-exposure-notification-service-1.1.44.tgz#bf02c63efa98f61cff4c01b0a7eb150c094d6640"
-  integrity sha512-sL4+NnVcWSjh9l8S2oLHMJh5YPEJGGg0jKAqERoKlwS2lA51uWJGS7/DcHDQSTiiwp5y4EEvPF4ZJ4y5YjM4sA==
+react-native-exposure-notification-service@1.2.6:
+  version "1.2.6"
+  resolved "https://registry.yarnpkg.com/react-native-exposure-notification-service/-/react-native-exposure-notification-service-1.2.6.tgz#e0ba0b80352d243b7843ee01edd669a372198abd"
+  integrity sha512-BJwgj1G0iN+5vvJgCgN3z6tdEVz3xXzrKPqoTk6Z0BTl9bQ47VEhHsILvygc5aN5HKJM78eBsQezccgLNDrLpg==
 
 react-native-flipper@^0.34.0:
   version "0.34.0"