diff --git a/src/api/src/error.rs b/src/api/src/error.rs
index d58fe96..a8a5149 100644
--- a/src/api/src/error.rs
+++ b/src/api/src/error.rs
@@ -26,27 +26,3 @@ pub enum PaymentError {
     },
     InvalidPatron,
 }
-
-impl std::fmt::Display for PaymentError {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        match self {
-            PaymentError::UnsupportedPaymentType => write!(f, "Unsupported payment type"),
-            PaymentError::LedgerUnreachable { ledger } => {
-                write!(f, "Ledger unreachable: {ledger}")
-            }
-            PaymentError::LedgerWithdrawFromError { ledger, error } => {
-                write!(f, "Ledger {ledger} withdraw_from error: {error:?}")
-            }
-            PaymentError::LedgerTransferFromError { ledger, error } => {
-                write!(f, "Ledger {ledger} transfer_from error: {error:?}")
-            }
-            PaymentError::InsufficientFunds { needed, available } => {
-                write!(
-                    f,
-                    "Insufficient funds: needed {needed}, available {available}"
-                )
-            }
-            PaymentError::InvalidPatron => write!(f, "Invalid patron"),
-        }
-    }
-}
diff --git a/src/wrapper/src/api/call.rs b/src/wrapper/src/api/call.rs
index f5433d8..69fc481 100644
--- a/src/wrapper/src/api/call.rs
+++ b/src/wrapper/src/api/call.rs
@@ -5,8 +5,8 @@ use crate::domain::types::BridgeCallArgs;
 use crate::payments::guard_config::PAYMENT_GUARD;
 use crate::util::cycles::forward_raw;
 
-fn map_guard_err<E: core::fmt::Display>(e: E) -> String {
-    BridgeError::GuardError(e.to_string()).to_string()
+fn map_guard_err<E: core::fmt::Debug>(e: E) -> String {
+    BridgeError::GuardError(format!("{e:?}")).to_string()
 }
 
 /// Internal helper to unify the bridge logic: charge fee -> forward call.