diff --git a/src/modules/IPG/gateways/sep.ts b/src/modules/IPG/gateways/sep.ts
index 14282e1..f01ca2f 100644
--- a/src/modules/IPG/gateways/sep.ts
+++ b/src/modules/IPG/gateways/sep.ts
@@ -92,7 +92,30 @@ class SepGateway implements IGateway {
         verifyData,
         { headers: this.requestHeader }
       );
-      return response.data;
+
+      const sepResponse = response.data;
+
+      // Normalize SEP response to match expected format
+      // SEP considers ResultCode = 0 and Success = true as successful
+      const isSuccess = sepResponse.ResultCode === 0 && sepResponse.Success === true;
+
+      // Validate amount if transaction details are available
+      let amountValid = true;
+      if (sepResponse.TransactionDetail && sepResponse.TransactionDetail.OrginalAmount) {
+        // According to SEP docs, OrginalAmount should match the expected amount
+        amountValid = sepResponse.TransactionDetail.OrginalAmount === data.amount;
+        if (!amountValid) {
+          this.logger.warn(`SEP amount mismatch: expected ${data.amount}, got ${sepResponse.TransactionDetail.OrginalAmount}`);
+        }
+      }
+
+      return {
+        code: (isSuccess && amountValid) ? 100 : sepResponse.ResultCode, // Use 100 for success to match expected format
+        message: sepResponse.ResultDescription,
+        ref_id: data.refNum, // SEP uses refNum as transaction identifier
+        success: isSuccess && amountValid,
+        raw_response: sepResponse // Keep original response for debugging
+      };
     } catch (error) {
       this.logger.error("error in SEP payment verification", error);
       throw new InternalError(["error in SEP payment verification"]);