diff --git a/src/content_scripts/notify.ts b/src/content_scripts/notify.ts
index 582375e1d..a731e4da1 100644
--- a/src/content_scripts/notify.ts
+++ b/src/content_scripts/notify.ts
@@ -76,20 +76,6 @@ namespace TalerNotify {
     });
   }
 
-  function checkRepurchase(contract: string): Promise<any> {
-    const walletMsg = {
-      type: "check-repurchase",
-      detail: {
-        contract: contract
-      },
-    };
-    return new Promise((resolve, reject) => {
-      chrome.runtime.sendMessage(walletMsg, (resp: any) => {
-        resolve(resp);
-      });
-    });
-  }
-
   function queryPayment(query: any): Promise<any> {
     // current URL without fragment
     const walletMsg = {
@@ -239,49 +225,32 @@ namespace TalerNotify {
       return;
     }
 
-    let resp = await checkRepurchase(proposal.data);
-
-    if (resp.error) {
-      console.error("wallet backend error", resp);
-      return;
+    let merchantName = "(unknown)";
+    try {
+      merchantName = proposal.data.merchant.name;
+    } catch (e) {
+      // bad contract / name not included
     }
 
-    if (resp.isRepurchase) {
-      logVerbose && console.log("doing repurchase");
-      console.assert(resp.existingFulfillmentUrl);
-      console.assert(resp.existingContractHash);
-      window.location.href = subst(resp.existingFulfillmentUrl,
-                                   resp.existingContractHash);
-
-    } else {
-
-      let merchantName = "(unknown)";
-      try {
-        merchantName = proposal.data.merchant.name;
-      } catch (e) {
-        // bad contract / name not included
+    let historyEntry = {
+      timestamp: (new Date).getTime(),
+      subjectId: `contract-${contractHash}`,
+      type: "offer-contract",
+      detail: {
+        contractHash,
+        merchantName,
       }
+    };
+    await putHistory(historyEntry);
+    let offerId = await saveOffer(proposal);
 
-      let historyEntry = {
-        timestamp: (new Date).getTime(),
-        subjectId: `contract-${contractHash}`,
-        type: "offer-contract",
-        detail: {
-          contractHash,
-          merchantName,
-        }
-      };
-      await putHistory(historyEntry);
-      let offerId = await saveOffer(proposal);
-
-      const uri = URI(chrome.extension.getURL(
-        "/src/pages/confirm-contract.html"));
-      const params = {
-        offerId: offerId.toString(),
-      };
-      const target = uri.query(params).href();
-      document.location.replace(target);
-    }
+    const uri = URI(chrome.extension.getURL(
+      "/src/pages/confirm-contract.html"));
+    const params = {
+      offerId: offerId.toString(),
+    };
+    const target = uri.query(params).href();
+    document.location.replace(target);
   }
 
   function registerHandlers() {
diff --git a/src/types-test.ts b/src/types-test.ts
index f8f25bc00..7298728ff 100644
--- a/src/types-test.ts
+++ b/src/types-test.ts
@@ -53,7 +53,6 @@ test("contract validation", (t: TestLib) => {
     timestamp: "Date(12345)",
     transaction_id: 1234,
     fulfillment_url: "foo",
-    repurchase_correlation_id: "blabla",
   };
 
   types.Contract.checked(c);
diff --git a/src/types.ts b/src/types.ts
index 30e9b7856..28c989a0f 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -486,12 +486,6 @@ export class Contract {
   @Checkable.String
   fulfillment_url: string;
 
-  @Checkable.Optional(Checkable.String)
-  repurchase_correlation_id: string;
-
-  @Checkable.Optional(Checkable.String)
-  instance: string;
-
   @Checkable.Any
   extra: any;
 
@@ -614,13 +608,6 @@ export namespace Amounts {
 }
 
 
-export interface CheckRepurchaseResult {
-  isRepurchase: boolean;
-  existingContractHash?: string;
-  existingFulfillmentUrl?: string;
-}
-
-
 export interface Notifier {
   notify(): void;
 }
diff --git a/src/wallet.ts b/src/wallet.ts
index 67393edae..01d26c297 100644
--- a/src/wallet.ts
+++ b/src/wallet.ts
@@ -24,7 +24,6 @@
 import {
   AmountJson,
   Amounts,
-  CheckRepurchaseResult,
   CoinRecord,
   CoinPaySig,
   Contract,
@@ -349,10 +348,6 @@ export namespace Stores {
       super("transactions", {keyPath: "contractHash"});
     }
 
-    repurchaseIndex = new Index<[string,string],TransactionRecord>(this, "repurchase", [
-      "contract.merchant_pub",
-      "contract.repurchase_correlation_id"
-    ]);
     fulfillmentUrlIndex = new Index<string,TransactionRecord>(this, "fulfillment_url", "contract.fulfillment_url");
     orderIdIndex = new Index<string,TransactionRecord>(this, "order_id", "contract.order_id");
   }
@@ -1691,34 +1686,6 @@ export class Wallet {
     return this.cryptoApi.hashString(canonicalJson(contract));
   }
 
-  /**
-   * Check if there's an equivalent contract we've already purchased.
-   */
-  async checkRepurchase(contract: Contract): Promise<CheckRepurchaseResult> {
-    if (!contract.repurchase_correlation_id) {
-      console.log("no repurchase: no correlation id");
-      return {isRepurchase: false};
-    }
-    let result: TransactionRecord|undefined = await (
-      this.q()
-          .getIndexed(Stores.transactions.repurchaseIndex,
-                      [
-                        contract.merchant_pub,
-                        contract.repurchase_correlation_id
-                      ]));
-
-    if (result) {
-      console.assert(result.contract.repurchase_correlation_id == contract.repurchase_correlation_id);
-      return {
-        isRepurchase: true,
-        existingContractHash: result.contractHash,
-        existingFulfillmentUrl: result.contract.fulfillment_url,
-      };
-    } else {
-      return {isRepurchase: false};
-    }
-  }
-
 
   /**
    * Generate a nonce in form of an EdDSA public key.
diff --git a/src/wxBackend.ts b/src/wxBackend.ts
index cdc8f4392..5957e1e1b 100644
--- a/src/wxBackend.ts
+++ b/src/wxBackend.ts
@@ -35,7 +35,7 @@ import * as logging from "./logging";
 "use strict";
 
 const DB_NAME = "taler";
-const DB_VERSION = 14;
+const DB_VERSION = 15;
 
 import {Stores} from "./wallet";
 import {Store, Index} from "./query";
@@ -194,10 +194,6 @@ function makeHandlers(db: IDBDatabase,
       let amount = AmountJson.checked(detail.amount);
       return wallet.getReserveCreationInfo(detail.baseUrl, amount);
     },
-    ["check-repurchase"]: function (detail, sender) {
-      let contract = Contract.checked(detail.contract);
-      return wallet.checkRepurchase(contract);
-    },
     ["get-history"]: function (detail, sender) {
       // TODO: limit history length
       return wallet.getHistory();
diff --git a/tsconfig.json b/tsconfig.json
index 1bff3f8fb..417068de3 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -10,7 +10,8 @@
     "noImplicitReturns": true,
     "noFallthroughCasesInSwitch": true,
     "strictNullChecks": true,
-    "noImplicitAny": true
+    "noImplicitAny": true,
+    "alwaysStrict": true
   },
   "files": [
     "decl/chrome/chrome.d.ts",