diff --git a/boot/modules/acquiring/src/main/java/com/klaro/acquirecore/acquiring/repository/TxRepository.java b/boot/modules/acquiring/src/main/java/com/klaro/acquirecore/acquiring/repository/TxRepository.java
new file mode 100644
index 0000000..f64cee4
--- /dev/null
+++ b/boot/modules/acquiring/src/main/java/com/klaro/acquirecore/acquiring/repository/TxRepository.java
@@ -0,0 +1,40 @@
+package com.klaro.acquirecore.acquiring.repository;
+
+import com.klaro.acquirecore.acquiring.dto.TxMessage;
+
+/**
+ * Repository interface for TX data access.
+ * Stub implementation - actual DB access to be implemented.
+ */
+public interface TxRepository {
+
+    /**
+     * Check if merchant is active.
+     */
+    boolean isMerchantActive(String merchantId);
+
+    /**
+     * Check if terminal is active for given merchant.
+     */
+    boolean isTerminalActive(String merchantId, String terminalId);
+
+    /**
+     * Save transaction record.
+     */
+    void saveTransaction(TxMessage msg);
+
+    /**
+     * Check if transaction exists.
+     */
+    boolean transactionExists(String txId);
+
+    /**
+     * Get transaction status.
+     */
+    String getTransactionStatus(String txId);
+
+    /**
+     * Update transaction status.
+     */
+    void updateTransactionStatus(String txId, String status);
+}