diff --git a/boot/common-framework/src/main/java/com/klaro/acquirecore/framework/TxCore.java b/boot/common-framework/src/main/java/com/klaro/acquirecore/framework/TxCore.java
new file mode 100644
index 0000000..37628a3
--- /dev/null
+++ b/boot/common-framework/src/main/java/com/klaro/acquirecore/framework/TxCore.java
@@ -0,0 +1,280 @@
+package com.klaro.acquirecore.framework;
+
+import java.nio.ByteBuffer;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.util.concurrent.atomic.AtomicLong;
+
+/**
+ * TxCore - Spring Boot equivalent of C txcore.h/txcore.c
+ * Provides transaction context, buffer, request/response DTOs, and result codes.
+ */
+public final class TxCore {
+
+    private TxCore() {}
+
+    // ===== TxResult - equivalent to C tx_result_t enum =====
+
+    public enum TxResult {
+        OK(0), ERROR(-1), TIMEOUT(-2), ROLLBACK(-3), NESTED(-4);
+
+        private final int code;
+
+        TxResult(int code) {
+            this.code = code;
+        }
+
+        public int getCode() {
+            return code;
+        }
+
+        public static TxResult fromCode(int code) {
+            for (TxResult r : values()) {
+                if (r.code == code) return r;
+            }
+            return ERROR;
+        }
+
+        public boolean isSuccess() {
+            return this == OK;
+        }
+
+        public String toErrorString() {
+            return switch (this) {
+                case OK -> "OK";
+                case ERROR -> "Error";
+                case TIMEOUT -> "Timeout";
+                case ROLLBACK -> "Rollback";
+                case NESTED -> "Nested transaction not supported";
+            };
+        }
+    }
+
+    // ===== TxBuffer - equivalent to C txbuf_t struct =====
+
+    public static final class TxBuffer {
+        private static final int MAX_BUFSIZE = 4096;
+        private final ByteBuffer buffer;
+        private final Map<String, Object> data;
+
+        public TxBuffer() {
+            this.buffer = ByteBuffer.allocate(MAX_BUFSIZE);
+            this.data = new HashMap<>();
+        }
+
+        public TxBuffer(int capacity) {
+            this.buffer = ByteBuffer.allocate(Math.min(capacity, MAX_BUFSIZE));
+            this.data = new HashMap<>();
+        }
+
+        public int write(byte[] src) {
+            if (src == null || buffer.remaining() < src.length) return -1;
+            buffer.put(src);
+            return src.length;
+        }
+
+        public int read(byte[] dest) {
+            if (dest == null || buffer.remaining() < dest.length) return -1;
+            buffer.get(dest);
+            return dest.length;
+        }
+
+        public byte[] toByteArray() {
+            byte[] result = new byte[buffer.position()];
+            buffer.flip();
+            buffer.get(result);
+            return result;
+        }
+
+        public void put(String key, Object value) {
+            data.put(key, value);
+        }
+
+        @SuppressWarnings("unchecked")
+        public <T> T get(String key) {
+            return (T) data.get(key);
+        }
+
+        public Map<String, Object> getData() {
+            return new HashMap<>(data);
+        }
+
+        public void clear() {
+            buffer.clear();
+            data.clear();
+        }
+
+        public void rewind() {
+            buffer.rewind();
+        }
+
+        public int size() {
+            return buffer.position();
+        }
+
+        public int remaining() {
+            return buffer.remaining();
+        }
+    }
+
+    // ===== TxContext - equivalent to C tx_context_t struct =====
+
+    public static final class TxContext {
+        private static final AtomicLong txnCounter = new AtomicLong(0);
+
+        private final long txnId;
+        private final int flags;
+        private final TxBuffer buffer;
+        private final Map<String, Object> userData;
+
+        public TxContext() {
+            this(0);
+        }
+
+        public TxContext(int flags) {
+            this.txnId = txnCounter.incrementAndGet();
+            this.flags = flags;
+            this.buffer = new TxBuffer();
+            this.userData = new HashMap<>();
+        }
+
+        public long getTxnId() {
+            return txnId;
+        }
+
+        public int getFlags() {
+            return flags;
+        }
+
+        public TxBuffer getBuffer() {
+            return buffer;
+        }
+
+        public void setUserData(String key, Object value) {
+            userData.put(key, value);
+        }
+
+        @SuppressWarnings("unchecked")
+        public <T> T getUserData(String key) {
+            return (T) userData.get(key);
+        }
+
+        public void clearUserData() {
+            userData.clear();
+        }
+
+        public void resetBuffer() {
+            buffer.clear();
+        }
+
+        @Override
+        public String toString() {
+            return "TxContext{txnId=" + txnId + ", flags=" + flags + ", bufferSize=" + buffer.size() + "}";
+        }
+    }
+
+    // ===== TxRequest - equivalent to C input void* parameter =====
+
+    public static final class TxRequest {
+        private final String serviceName;
+        private final Map<String, Object> payload;
+        private final TxContext context;
+
+        public TxRequest(String serviceName, Map<String, Object> payload, TxContext context) {
+            this.serviceName = Objects.requireNonNull(serviceName);
+            this.payload = payload != null ? Map.copyOf(payload) : Map.of();
+            this.context = context;
+        }
+
+        public static TxRequest of(String serviceName) {
+            return new TxRequest(serviceName, Map.of(), null);
+        }
+
+        public static TxRequest of(String serviceName, Map<String, Object> payload) {
+            return new TxRequest(serviceName, payload, null);
+        }
+
+        public String getServiceName() {
+            return serviceName;
+        }
+
+        public Map<String, Object> getPayload() {
+            return payload;
+        }
+
+        public TxContext getContext() {
+            return context;
+        }
+
+        @SuppressWarnings("unchecked")
+        public <T> T get(String key) {
+            return (T) payload.get(key);
+        }
+
+        public boolean has(String key) {
+            return payload.containsKey(key);
+        }
+    }
+
+    // ===== TxResponse - equivalent to C output void* parameter =====
+
+    public static final class TxResponse {
+        private final TxResult result;
+        private final Map<String, Object> data;
+        private final String errorMessage;
+
+        private TxResponse(TxResult result, Map<String, Object> data, String errorMessage) {
+            this.result = Objects.requireNonNull(result);
+            this.data = data != null ? Map.copyOf(data) : Map.of();
+            this.errorMessage = errorMessage;
+        }
+
+        public static TxResponse success() {
+            return new TxResponse(TxResult.OK, Map.of(), null);
+        }
+
+        public static TxResponse success(Map<String, Object> data) {
+            return new TxResponse(TxResult.OK, data, null);
+        }
+
+        public static TxResponse error(TxResult result) {
+            return new TxResponse(result, Map.of(), result.toErrorString());
+        }
+
+        public static TxResponse error(TxResult result, String message) {
+            return new TxResponse(result, Map.of(), message);
+        }
+
+        public static TxResponse error(String message) {
+            return new TxResponse(TxResult.ERROR, Map.of(), message);
+        }
+
+        public TxResult getResult() {
+            return result;
+        }
+
+        public Map<String, Object> getData() {
+            return data;
+        }
+
+        public String getErrorMessage() {
+            return errorMessage;
+        }
+
+        public boolean isSuccess() {
+            return result.isSuccess();
+        }
+
+        @SuppressWarnings("unchecked")
+        public <T> T get(String key) {
+            return (T) data.get(key);
+        }
+
+        public TxResponse with(String key, Object value) {
+            Map<String, Object> newData = new HashMap<>(this.data);
+            newData.put(key, value);
+            return new TxResponse(this.result, newData, this.errorMessage);
+        }
+    }
+}