diff --git a/extension/src/background.js b/extension/src/background.js
index 1fd82da..f2be9f0 100644
--- a/extension/src/background.js
+++ b/extension/src/background.js
@@ -1,6 +1,22 @@
 console.log('i am a background script');
 
-const codeCache = new Map();
+const datastore = new Map();
+
+function attachActivityDetails(activityId, date, time, name) {
+    if (datastore.has(activityId)) {
+        const activity = datastore.get(activityId);
+        activity.name = name;
+        activity.date = date;
+        activity.time = time;
+    } else {
+        datastore.set(activityId, {
+            date,
+            time,
+            name,
+            code: null,
+        });
+    }
+}
 
 function extractActivityId(url) {
     const m = url.match(/^https:\/\/checkin\.york\.ac\.uk\/api\/selfregistration\/([0-9]+)\/present$/m);
@@ -10,13 +26,18 @@ function extractActivityId(url) {
 function interceptSubmit(details) {
     const activityId = extractActivityId(details.url);
     const codeCorrect = details.statusCode >= 200 && details.statusCode <= 299;
-    if (!codeCache.has(activityId)) {
-        console.error('we did not manage to log a code for activity', activityId);
+    if (!datastore.has(activityId)) {
+        console.error('we do not have information about the activity', activityId);
         return;
     }
-    const code = codeCache.get(activityId);
-    codeCache.delete(activityId);
+    const activity = datastore.get(activityId);
+    if (!activity.date || !activity.time || !activity.name || !activity.code) {
+        console.error('we do not have all the information about the activity', activityId);
+        return;
+    }
+
     console.log('request for activity', activityId, 'the code', code, 'was', codeCorrect ? 'correct' : 'incorrect');
+    // TODO: Send data to server.
 }
 
 function interceptCode(details) {
@@ -35,7 +56,16 @@ function interceptCode(details) {
         return;
     }
     const code = body.formData['code'][0];
-    codeCache.set(activityId, code);
+    if (datastore.has(activityId)) {
+        datastore.get(activityId).code = code;
+    } else {
+        datastore.set(activityId, {
+            date: null,
+            time: null,
+            name: null,
+            code,
+        });
+    }
 }
 
 browser.webRequest.onBeforeRequest.addListener(interceptCode, {