diff --git a/src/crypto/workers/cryptoImplementation.ts b/src/crypto/workers/cryptoImplementation.ts
index 43def7b6b..979fe41d8 100644
--- a/src/crypto/workers/cryptoImplementation.ts
+++ b/src/crypto/workers/cryptoImplementation.ts
@@ -336,7 +336,7 @@ export class CryptoImplementation {
     const d = buildSigPS(SignaturePurpose.WALLET_COIN_DEPOSIT)
       .put(decodeCrock(depositInfo.contractTermsHash))
       .put(decodeCrock(depositInfo.wireInfoHash))
-      .put(hash(decodeCrock(depositInfo.denomPub)))
+      .put(decodeCrock(depositInfo.denomPubHash))
       .put(timestampRoundedToBuffer(depositInfo.timestamp))
       .put(timestampRoundedToBuffer(depositInfo.refundDeadline))
       .put(amountToBuffer(depositInfo.spendAmount))
@@ -350,7 +350,7 @@ export class CryptoImplementation {
       coin_pub: depositInfo.coinPub,
       coin_sig: encodeCrock(coinSig),
       contribution: Amounts.stringify(depositInfo.spendAmount),
-      denom_pub: depositInfo.denomPub,
+      h_denom: depositInfo.denomPubHash,
       exchange_url: depositInfo.exchangeBaseUrl,
       ub_sig: depositInfo.denomSig,
     };
diff --git a/src/headless/integrationtest.ts b/src/headless/integrationtest.ts
index db96d57c4..786907a09 100644
--- a/src/headless/integrationtest.ts
+++ b/src/headless/integrationtest.ts
@@ -25,6 +25,7 @@ import { NodeHttpLib } from "./NodeHttpLib";
 import { Wallet } from "../wallet";
 import { Configuration } from "../util/talerconfig";
 import { Amounts, AmountJson } from "../util/amounts";
+import { OperationFailedAndReportedError, OperationFailedError } from "../operations/errors";
 
 const logger = new Logger("integrationtest.ts");
 
@@ -69,9 +70,9 @@ async function makePayment(
   }
 
   const confirmPayResult = await wallet.confirmPay(
-    preparePayResult.proposalId,
-    undefined,
-  );
+      preparePayResult.proposalId,
+      undefined,
+    );
 
   console.log("confirmPayResult", confirmPayResult);
 
diff --git a/src/headless/taler-wallet-cli.ts b/src/headless/taler-wallet-cli.ts
index 3f116670d..fc13d77f3 100644
--- a/src/headless/taler-wallet-cli.ts
+++ b/src/headless/taler-wallet-cli.ts
@@ -30,7 +30,7 @@ import {
   setupRefreshPlanchet,
   encodeCrock,
 } from "../crypto/talerCrypto";
-import { OperationFailedAndReportedError } from "../operations/errors";
+import { OperationFailedAndReportedError, OperationFailedError } from "../operations/errors";
 import { Bank } from "./bank";
 import { classifyTalerUri, TalerUriType } from "../util/taleruri";
 import { Configuration } from "../util/talerconfig";
@@ -97,7 +97,6 @@ async function doPay(
 
   if (pay) {
     await wallet.confirmPay(result.proposalId, undefined);
-    console.log("paid!");
   } else {
     console.log("not paying");
   }
diff --git a/src/operations/balance.ts b/src/operations/balance.ts
index 36971c395..81b4da6e0 100644
--- a/src/operations/balance.ts
+++ b/src/operations/balance.ts
@@ -130,7 +130,7 @@ export async function getBalancesInsideTransaction(
     if (t.timestampFirstSuccessfulPay) {
       return;
     }
-    for (const c of t.payReq.coins) {
+    for (const c of t.coinDepositPermissions) {
       addTo(
         balanceStore,
         "pendingPayment",
diff --git a/src/operations/errors.ts b/src/operations/errors.ts
index 9def02b0e..01a8283cb 100644
--- a/src/operations/errors.ts
+++ b/src/operations/errors.ts
@@ -24,8 +24,6 @@
  * Imports.
  */
 import { OperationError } from "../types/walletTypes";
-import { HttpResponse } from "../util/http";
-import { Codec } from "../util/codec";
 
 /**
  * This exception is there to let the caller know that an error happened,
diff --git a/src/operations/history.ts b/src/operations/history.ts
index f04dad113..9cbbd5163 100644
--- a/src/operations/history.ts
+++ b/src/operations/history.ts
@@ -246,7 +246,7 @@ export async function getHistory(
             contribution: string;
             denomPub: string;
           }[] = [];
-          for (const x of purchase.payReq.coins) {
+          for (const x of purchase.coinDepositPermissions) {
             const c = await tx.get(Stores.coins, x.coin_pub);
             if (!c) {
               // FIXME: what to do here??
@@ -269,7 +269,7 @@ export async function getHistory(
           verboseDetails = { coins };
         }
         const amountPaidWithFees = Amounts.sum(
-          purchase.payReq.coins.map((x) =>
+          purchase.coinDepositPermissions.map((x) =>
             Amounts.parseOrThrow(x.contribution),
           ),
         ).amount;
@@ -280,7 +280,7 @@ export async function getHistory(
           replay: pe.isReplay,
           sessionId: pe.sessionId,
           timestamp: pe.timestamp,
-          numCoins: purchase.payReq.coins.length,
+          numCoins: purchase.coinDepositPermissions.length,
           amountPaidWithFees: Amounts.stringify(amountPaidWithFees),
           verboseDetails,
         });
diff --git a/src/operations/pay.ts b/src/operations/pay.ts
index abcb2ad1d..74bfcc70b 100644
--- a/src/operations/pay.ts
+++ b/src/operations/pay.ts
@@ -42,6 +42,7 @@ import {
   codecForProposal,
   codecForContractTerms,
   CoinDepositPermission,
+  codecForMerchantPayResponse,
 } from "../types/talerTypes";
 import {
   ConfirmPayResult,
@@ -431,12 +432,6 @@ async function recordConfirmPay(
     sessionId = proposal.downloadSessionId;
   }
   logger.trace(`recording payment with session ID ${sessionId}`);
-  const payReq: PayReq = {
-    coins: coinDepositPermissions,
-    merchant_pub: d.contractData.merchantPub,
-    mode: "pay",
-    order_id: d.contractData.orderId,
-  };
   const payCostInfo = await getTotalPaymentCost(ws, coinSelection);
   const t: PurchaseRecord = {
     abortDone: false,
@@ -445,8 +440,8 @@ async function recordConfirmPay(
     contractData: d.contractData,
     lastSessionId: sessionId,
     payCoinSelection: coinSelection,
-    payReq,
     payCostInfo,
+    coinDepositPermissions,
     timestampAccept: getTimestampNow(),
     timestampLastRefundStatus: undefined,
     proposalId: proposal.proposalId,
@@ -609,7 +604,6 @@ async function processDownloadProposalImpl(
   ).href;
   logger.trace("downloading contract from '" + orderClaimUrl + "'");
 
-  
   const proposalResp = await httpPostTalerJson({
     url: orderClaimUrl,
     body: {
@@ -777,26 +771,24 @@ export async function submitPay(
     throw Error("not submitting payment for aborted purchase");
   }
   const sessionId = purchase.lastSessionId;
-  let resp;
-  const payReq = { ...purchase.payReq, session_id: sessionId };
 
   console.log("paying with session ID", sessionId);
 
-  const payUrl = new URL("pay", purchase.contractData.merchantBaseUrl).href;
+  const payUrl = new URL(
+    `orders/${purchase.contractData.orderId}/pay`,
+    purchase.contractData.merchantBaseUrl,
+  ).href;
+
+  const merchantResp = await httpPostTalerJson({
+    url: payUrl,
+    body: {
+      coins: purchase.coinDepositPermissions,
+      session_id: purchase.lastSessionId,
+    },
+    codec: codecForMerchantPayResponse(),
+    http: ws.http,
+  });
 
-  try {
-    console.log("pay req", payReq);
-    resp = await ws.http.postJson(payUrl, payReq);
-  } catch (e) {
-    // Gives the user the option to retry / abort and refresh
-    console.log("payment failed", e);
-    throw e;
-  }
-  if (resp.status !== 200) {
-    console.log(await resp.json());
-    throw Error(`unexpected status (${resp.status}) for /pay`);
-  }
-  const merchantResp = await resp.json();
   console.log("got success from pay URL", merchantResp);
 
   const now = getTimestampNow();
@@ -1030,7 +1022,7 @@ export async function confirmPay(
       coinPriv: coin.coinPriv,
       coinPub: coin.coinPub,
       contractTermsHash: d.contractData.contractTermsHash,
-      denomPub: coin.denomPub,
+      denomPubHash: coin.denomPubHash,
       denomSig: coin.denomSig,
       exchangeBaseUrl: coin.exchangeBaseUrl,
       feeDeposit: denom.feeDeposit,
@@ -1050,8 +1042,6 @@ export async function confirmPay(
     sessionIdOverride,
   );
 
-  logger.trace("confirmPay: submitting payment after creating purchase record");
-  logger.trace("purchaseRecord:", purchase);
   return submitPay(ws, proposalId);
 }
 
diff --git a/src/types/dbTypes.ts b/src/types/dbTypes.ts
index 4f7b89b67..b085f83db 100644
--- a/src/types/dbTypes.ts
+++ b/src/types/dbTypes.ts
@@ -1250,10 +1250,9 @@ export interface PurchaseRecord {
   contractData: WalletContractData;
 
   /**
-   * The payment request, ready to be send to the merchant's
-   * /pay URL.
+   * Deposit permissions, available once the user has accepted the payment.
    */
-  payReq: PayReq;
+  coinDepositPermissions: CoinDepositPermission[];
 
   payCoinSelection: PayCoinSelection;
 
diff --git a/src/types/talerTypes.ts b/src/types/talerTypes.ts
index 0221d26bb..232f5f314 100644
--- a/src/types/talerTypes.ts
+++ b/src/types/talerTypes.ts
@@ -215,7 +215,7 @@ export interface CoinDepositPermission {
   /**
    * The denomination public key associated with this coin.
    */
-  denom_pub: string;
+  h_denom: string;
   /**
    * The amount that is subtracted from this coin with this payment.
    */
@@ -433,31 +433,6 @@ export class ContractTerms {
   extra: any;
 }
 
-/**
- * Payment body sent to the merchant's /pay.
- */
-export interface PayReq {
-  /**
-   * Coins with signature.
-   */
-  coins: CoinDepositPermission[];
-
-  /**
-   * The merchant public key, used to uniquely
-   * identify the merchant instance.
-   */
-  merchant_pub: string;
-
-  /**
-   * Order ID that's being payed for.
-   */
-  order_id: string;
-
-  /**
-   * Mode for /pay.
-   */
-  mode: "pay" | "abort-refund";
-}
 
 /**
  * Refund permission in the format that the merchant gives it to us.
@@ -809,6 +784,10 @@ export interface CoinDumpJson {
   }>;
 }
 
+export interface MerchantPayResponse {
+  sig: string;
+}
+
 export type AmountString = string;
 export type Base32String = string;
 export type EddsaSignatureString = string;
@@ -1044,3 +1023,8 @@ export const codecForWithdrawResponse = (): Codec<WithdrawResponse> =>
   makeCodecForObject<WithdrawResponse>()
     .property("ev_sig", codecForString)
     .build("WithdrawResponse");
+
+export const codecForMerchantPayResponse = (): Codec<MerchantPayResponse> =>
+  makeCodecForObject<MerchantPayResponse>()
+    .property("sig", codecForString)
+    .build("MerchantPayResponse");
diff --git a/src/types/walletTypes.ts b/src/types/walletTypes.ts
index 63b20095e..ee7d071c6 100644
--- a/src/types/walletTypes.ts
+++ b/src/types/walletTypes.ts
@@ -473,7 +473,7 @@ export interface DepositInfo {
   merchantPub: string;
   feeDeposit: AmountJson;
   wireInfoHash: string;
-  denomPub: string;
+  denomPubHash: string;
   denomSig: string;
 }