diff --git a/packages/taler-util/src/transactionsTypes.ts b/packages/taler-util/src/transactionsTypes.ts
index f7383f902..645f0120b 100644
--- a/packages/taler-util/src/transactionsTypes.ts
+++ b/packages/taler-util/src/transactionsTypes.ts
@@ -344,6 +344,11 @@ export interface TransactionTip extends TransactionCommon {
   // Raw amount of the tip, without extra fees that apply
   amountRaw: AmountString;
 
+  /**
+   * More information about the merchant
+   */
+  // merchant: MerchantInfo;
+
   // Amount will be (or was) added to the wallet's balance after fees and refreshing
   amountEffective: AmountString;
 
diff --git a/packages/taler-util/src/walletTypes.ts b/packages/taler-util/src/walletTypes.ts
index 245b5654e..9f7ba417a 100644
--- a/packages/taler-util/src/walletTypes.ts
+++ b/packages/taler-util/src/walletTypes.ts
@@ -854,6 +854,15 @@ export const codecForAbortProposalRequest = (): Codec<AbortProposalRequest> =>
     .property("proposalId", codecForString())
     .build("AbortProposalRequest");
 
+interface GetContractTermsDetailsRequest {
+  proposalId: string;
+}
+
+export const codecForGetContractTermsDetails = (): Codec<GetContractTermsDetailsRequest> =>
+  buildCodecForObject<GetContractTermsDetailsRequest>()
+    .property("proposalId", codecForString())
+    .build("GetContractTermsDetails");
+
 export interface PreparePayRequest {
   talerPayUri: string;
 }