diff --git a/packages/taler-wallet-core/src/operations/pay-merchant.ts b/packages/taler-wallet-core/src/operations/pay-merchant.ts
index 83c6b74d3..54ebdb5a4 100644
--- a/packages/taler-wallet-core/src/operations/pay-merchant.ts
+++ b/packages/taler-wallet-core/src/operations/pay-merchant.ts
@@ -1373,6 +1373,9 @@ export async function checkPaymentByProposalId(
 
     if (res.type !== "success") {
       logger.info("not allowing payment, insufficient coins");
+      logger.info(
+        `insufficient balance details: ${j2s(res.insufficientBalanceDetails)}`,
+      );
       return {
         status: PreparePayResultType.InsufficientBalance,
         contractTerms: d.contractTermsRaw,