diff --git a/extension/background/emscriptif.js b/extension/background/emscriptif.js
index 15eef7a3a..3d4868b1e 100644
--- a/extension/background/emscriptif.js
+++ b/extension/background/emscriptif.js
@@ -490,15 +490,36 @@ class WithdrawRequestPS extends SignatureStruct {
 }
 class AbsoluteTimeNbo extends PackedArenaObject {
     static fromTalerString(s) {
-        throw Error();
+        let x = new AbsoluteTimeNbo();
+        x.alloc();
+        let r = /Date\(([0-9]+)\)/;
+        let m = r.exec(s);
+        if (m.length != 2) {
+            throw Error();
+        }
+        let n = parseInt(m[1]);
+        console.log("setting", n);
+        // XXX: This only works up to 54 bit numbers.
+        set64(x.getNative(), n);
+        return x;
     }
     size() {
         return 8;
     }
 }
+// XXX: This only works up to 54 bit numbers.
+function set64(p, n) {
+    for (let i = 0; i < 8; ++i) {
+        Module.setValue(p + (8 - i), n & 0xFF, "i8");
+        n >>>= 8;
+    }
+}
 class UInt64 extends PackedArenaObject {
     static fromNumber(n) {
-        throw Error();
+        let x = new UInt64();
+        x.alloc();
+        set64(x.getNative(), n);
+        return x;
     }
     size() {
         return 8;
diff --git a/extension/background/emscriptif.ts b/extension/background/emscriptif.ts
index ce6f351c0..e44747d21 100644
--- a/extension/background/emscriptif.ts
+++ b/extension/background/emscriptif.ts
@@ -709,7 +709,18 @@ class WithdrawRequestPS extends SignatureStruct {
 
 class AbsoluteTimeNbo extends PackedArenaObject {
   static fromTalerString(s: string): AbsoluteTimeNbo {
-    throw Error();
+    let x = new AbsoluteTimeNbo();
+    x.alloc();
+    let r = /Date\(([0-9]+)\)/;
+    let m = r.exec(s);
+    if (m.length != 2) {
+      throw Error();
+    }
+    let n = parseInt(m[1]);
+    console.log("setting", n);
+    // XXX: This only works up to 54 bit numbers.
+    set64(x.getNative(), n);
+    return x;
   }
 
   size() {
@@ -718,9 +729,22 @@ class AbsoluteTimeNbo extends PackedArenaObject {
 }
 
 
+// XXX: This only works up to 54 bit numbers.
+function set64(p: number, n: number) {
+  for (let i = 0; i < 8; ++i) {
+    Module.setValue(p + (8 - i), n & 0xFF, "i8");
+    n >>>= 8;
+  }
+
+}
+
+
 class UInt64 extends PackedArenaObject {
   static fromNumber(n: number): UInt64 {
-    throw Error();
+    let x = new UInt64();
+    x.alloc();
+    set64(x.getNative(), n);
+    return x;
   }
 
   size() {
diff --git a/extension/background/wallet.js b/extension/background/wallet.js
index 422e60ca5..a24ee372b 100644
--- a/extension/background/wallet.js
+++ b/extension/background/wallet.js
@@ -148,9 +148,15 @@ function executePay(db, offer, payCoinInfo, merchantBaseUrl, chosenMint) {
         let req = new XMLHttpRequest();
         req.open('post', payUrl.href());
         req.setRequestHeader("Content-Type", "application/json;charset=UTF-8");
+        req.send(JSON.stringify(reqData));
         req.addEventListener('readystatechange', (e) => {
             if (req.readyState == XMLHttpRequest.DONE) {
-                resolve();
+                if (req.status == 200) {
+                    resolve();
+                }
+                else {
+                    throw Error("bad status " + req.status);
+                }
             }
         });
     });
@@ -173,6 +179,9 @@ function confirmPay(db, detail, sendResponse) {
         let mintUrl = Object.keys(mcs)[0];
         let ds = signDeposit(db, offer, mcs[mintUrl]);
         return executePay(db, offer, ds, detail.merchantPageUrl, mintUrl);
+    })
+        .then(() => {
+        sendResponse({ success: true });
     });
     return true;
 }
diff --git a/extension/background/wallet.ts b/extension/background/wallet.ts
index a2ac45dfa..9a9971f8d 100644
--- a/extension/background/wallet.ts
+++ b/extension/background/wallet.ts
@@ -231,9 +231,14 @@ function executePay(db,
     req.open('post', payUrl.href());
     req.setRequestHeader("Content-Type",
                          "application/json;charset=UTF-8");
+    req.send(JSON.stringify(reqData));
     req.addEventListener('readystatechange', (e) => {
       if (req.readyState == XMLHttpRequest.DONE) {
-        resolve()
+        if (req.status == 200) {
+          resolve();
+        } else {
+          throw Error("bad status " + req.status);
+        }
       }
     });
   });
@@ -262,6 +267,9 @@ function confirmPay(db, detail: ConfirmPayRequest, sendResponse) {
       let mintUrl = Object.keys(mcs)[0];
       let ds = signDeposit(db, offer, mcs[mintUrl]);
       return executePay(db, offer, ds, detail.merchantPageUrl, mintUrl);
+    })
+    .then(() => {
+      sendResponse({success: true});
     });
   return true;
 }
diff --git a/extension/content_scripts/notify.js b/extension/content_scripts/notify.js
index e86c0f84f..3777f2e7c 100644
--- a/extension/content_scripts/notify.js
+++ b/extension/content_scripts/notify.js
@@ -47,8 +47,9 @@ document.addEventListener("DOMContentLoaded", function(e) {
     let offer = JSON.parse(e.detail);
     let uri = URI(chrome.extension.getURL("pages/confirm-contract.html"));
     let params = {
-      offer: JSON.stringify(offer)
-    }
+      offer: JSON.stringify(offer),
+      merchantPageUrl: document.location.href
+    };
     document.location.href = uri.query(params).href();
   });
 });
diff --git a/extension/pages/confirm-contract.js b/extension/pages/confirm-contract.js
index 0f6d83744..60de27e90 100644
--- a/extension/pages/confirm-contract.js
+++ b/extension/pages/confirm-contract.js
@@ -23,8 +23,10 @@ document.addEventListener("DOMContentLoaded", (e) => {
     let html = template(offer.contract);
     $_("render-contract").innerHTML = html;
     document.getElementById("confirm-pay").addEventListener("click", (e) => {
+        console.log("Query:", JSON.stringify(query));
         let d = {
-            offer: JSON.parse(query.offer)
+            offer: JSON.parse(query.offer),
+            merchantPageUrl: query.merchantPageUrl
         };
         chrome.runtime.sendMessage({ type: 'confirm-pay', detail: d }, (resp) => {
             console.log("got response", resp);
diff --git a/extension/pages/confirm-contract.tsx b/extension/pages/confirm-contract.tsx
index c9d41a2c8..040f13ea3 100644
--- a/extension/pages/confirm-contract.tsx
+++ b/extension/pages/confirm-contract.tsx
@@ -34,8 +34,10 @@ document.addEventListener("DOMContentLoaded", (e) => {
   $_("render-contract").innerHTML = html;
 
   document.getElementById("confirm-pay").addEventListener("click", (e) => {
+    console.log("Query:", JSON.stringify(query));
     let d = {
-      offer: JSON.parse(query.offer)
+      offer: JSON.parse(query.offer),
+      merchantPageUrl: query.merchantPageUrl
     };
     chrome.runtime.sendMessage({type:'confirm-pay', detail: d}, (resp) => {
       console.log("got response", resp);