diff --git a/.gitignore b/.gitignore
index b83d222..2f7896d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1 @@
-/target/
+target/
diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 100644
index 0000000..9025d64
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1,148 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+phoenixd-java is a Java 21 client library for ACINQ's phoenixd REST API. It wraps HTTP endpoints for Lightning Network operations (invoices, payments, address handling) into typed Java requests and responses.
+
+## Maven Commands
+
+### Build & Test
+```bash
+# Clean build with unit tests
+mvn clean install
+
+# Run all tests (unit + integration)
+mvn -q verify
+
+# Build specific module
+mvn clean install -pl phoenixd-rest -am
+```
+
+### Test Individual Modules
+```bash
+# Test specific module
+mvn test -pl phoenixd-rest
+
+# Run single test class
+mvn test -pl phoenixd-rest -Dtest=ClassName
+
+# Run single test method
+mvn test -pl phoenixd-rest -Dtest=ClassName#methodName
+```
+
+### Code Coverage
+```bash
+# Generate coverage report (requires mvn verify)
+mvn clean verify
+
+# View aggregated report at:
+# target/site/jacoco-aggregate/index.html
+
+# Coverage threshold: 80% (enforced by jacoco-maven-plugin)
+```
+
+### Docker Build (Jib)
+```bash
+# Build and publish phoenixd-rest container
+./mvnw deploy -pl phoenixd-rest -am
+
+# Build and publish phoenixd-mock container
+./mvnw deploy -pl phoenixd-mock -am
+
+# Images are pushed to docker.398ja.xyz with version and 'latest' tags
+```
+
+## Module Architecture
+
+The project is a multi-module Maven build with a layered architecture:
+
+```
+phoenixd-java (parent)
+├── phoenixd-base       # Core abstractions and configuration
+├── phoenixd-model      # Request params and response DTOs
+├── phoenixd-rest       # HTTP client implementation
+├── phoenixd-mock       # Mock server for testing
+└── phoenixd-test       # Integration tests
+```
+
+### Module Dependencies
+- **phoenixd-base**: Foundation layer with `Request`, `Operation`, `Response` interfaces and `Configuration` utility
+- **phoenixd-model**: Depends on phoenixd-base; defines all param/response POJOs (e.g., `CreateInvoiceParam`, `PayInvoiceResponse`)
+- **phoenixd-rest**: Depends on phoenixd-model and phoenixd-base; implements abstract operations (GET, POST, etc.) and concrete request classes
+- **phoenixd-test**: Depends on phoenixd-rest; runs integration tests against a live phoenixd instance
+- **phoenixd-mock**: Standalone mock server; no dependencies on other modules
+
+### Request-Operation Pattern
+
+The library uses a two-layer pattern:
+1. **Request** layer (`AbstractRequest` + concrete implementations in `phoenixd-rest/request/impl/rest/`):
+   - Takes a `Param` object and an `Operation`
+   - Calls `operation.execute()` and deserializes the response body into a typed response object
+   - Example: `CreateBolt11InvoiceRequest`, `PayLightningAddressRequest`
+
+2. **Operation** layer (`AbstractOperation` + HTTP method implementations in `phoenixd-rest/operation/impl/`):
+   - Handles HTTP mechanics: building URIs, auth headers (Basic Auth), sending requests via `HttpClient`
+   - Replaces path variables (e.g., `{invoice}`) from `Param` fields
+   - Returns raw response body as string
+   - Example: `GetOperation`, `PostOperation`
+
+### PayRequestFactory
+Located in `phoenixd-rest/request/impl/rest/PayRequestFactory.java`, this factory detects whether a payment string is:
+- A Lightning address (contains `@`)
+- A BOLT11 invoice (matches `^(lnbc|lntb|lnsb|lnbcrt)[0-9]*[a-z0-9]+$` case-insensitive)
+
+Returns the appropriate `BasePayRequest` subclass.
+
+## Configuration
+
+Tests require a running phoenixd instance and the following environment variables:
+```bash
+PHOENIXD_USERNAME=...
+PHOENIXD_PASSWORD=...
+PHOENIXD_BASE_URL=http://localhost:9740  # or your phoenixd URL
+```
+
+Additional test-specific config lives in `phoenixd-test/src/test/resources/app.properties` (e.g., `test.pay_lnaddress`).
+
+Configuration resolution follows: **ENV > system properties > app.properties**. The `Configuration` class in phoenixd-base handles this.
+
+## Logging
+
+Uses SLF4J with Lombok's `@Slf4j`. phoenixd-rest ships `simplelogger.properties` with:
+- Default log level: INFO
+- `xyz.tcheeric` package: DEBUG
+- Date/time and thread name enabled
+
+Override at runtime:
+```bash
+JAVA_TOOL_OPTIONS="-Dorg.slf4j.simpleLogger.defaultLogLevel=info -Dorg.slf4j.simpleLogger.log.xyz.tcheeric=debug"
+```
+
+Or for Spring Boot apps, set in `application.properties`:
+```
+logging.level.xyz.tcheeric=DEBUG
+```
+
+**Logged events**:
+- HTTP request/response (method, URI, status, timeout)
+- Configuration resolution (where values came from)
+- Payment request detection logic (PayRequestFactory)
+- Sensitive headers (Authorization) are redacted
+
+## Code Style & Conventions
+
+From `.github/copilot-instructions.md`:
+- Commit messages follow `type: description` format (e.g., `fix: handle null node`, `feat: add invoice decoding`)
+- Use present tense verbs for the description
+- Breaking changes must be flagged with **BREAKING** in the PR/commit message
+- All new code should have test coverage
+- Use Lombok annotations (`@Data`, `@Slf4j`, `@NonNull`, `@SneakyThrows`) consistently
+
+## Testing Notes
+
+- Unit tests use JUnit 5 and AssertJ
+- phoenixd-rest uses MockWebServer (OkHttp) for HTTP mocking
+- Integration tests in phoenixd-test require a live phoenixd instance
+- When tests fail, check that env vars are set and phoenixd is reachable
diff --git a/phoenixd-base/target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst b/phoenixd-base/target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst
new file mode 100644
index 0000000..a88bf28
--- /dev/null
+++ b/phoenixd-base/target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst
@@ -0,0 +1,7 @@
+/home/runner/work/phoenixd-java/phoenixd-java/phoenixd-base/src/main/java/xyz/tcheeric/phoenixd/common/rest/Operation.java
+/home/runner/work/phoenixd-java/phoenixd-java/phoenixd-base/src/main/java/xyz/tcheeric/phoenixd/common/rest/VoidRequestParam.java
+/home/runner/work/phoenixd-java/phoenixd-java/phoenixd-base/src/main/java/xyz/tcheeric/phoenixd/common/rest/Request.java
+/home/runner/work/phoenixd-java/phoenixd-java/phoenixd-base/src/main/java/xyz/tcheeric/phoenixd/common/rest/Response.java
+/home/runner/work/phoenixd-java/phoenixd-java/phoenixd-base/src/main/java/xyz/tcheeric/phoenixd/common/rest/VoidResponse.java
+/home/runner/work/phoenixd-java/phoenixd-java/phoenixd-base/src/main/java/xyz/tcheeric/phoenixd/common/rest/util/Configuration.java
+/home/runner/work/phoenixd-java/phoenixd-java/phoenixd-base/src/main/java/xyz/tcheeric/phoenixd/common/rest/util/Constants.java
diff --git a/phoenixd-mock/src/main/java/xyz/tcheeric/phoenixd/mock/MockLnServer.java b/phoenixd-mock/src/main/java/xyz/tcheeric/phoenixd/mock/MockLnServer.java
index 9c0b2da..44bd190 100644
--- a/phoenixd-mock/src/main/java/xyz/tcheeric/phoenixd/mock/MockLnServer.java
+++ b/phoenixd-mock/src/main/java/xyz/tcheeric/phoenixd/mock/MockLnServer.java
@@ -8,9 +8,16 @@
 import java.io.OutputStream;
 import java.net.InetSocketAddress;
 import java.nio.charset.StandardCharsets;
+import java.security.SecureRandom;
 
 @RequiredArgsConstructor
 public class MockLnServer {
+    /**
+     * Bech32 generator values used in checksum calculation.
+     * These are fixed values defined by the Bech32 specification.
+     */
+    private static final int[] BECH32_GENERATOR = {0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3};
+
     private HttpServer server;
 
     private final int port;
@@ -44,12 +51,89 @@ private void handlePayLightningAddress(HttpExchange exchange) throws IOException
     }
 
     private void handleCreateInvoice(HttpExchange exchange) throws IOException {
-        // Generate a unique mock bolt11 invoice
+        // Generate a unique mock bolt11 invoice with valid Bech32 encoding
         String invoiceId = Long.toHexString(System.nanoTime());
-        String bolt11 = "lnbc1mock" + invoiceId;
+        String bolt11 = generateValidBolt11Invoice();
         writeJson(exchange, "{\"amountSat\":10,\"paymentHash\":\"hash" + invoiceId + "\",\"serialized\":\"" + bolt11 + "\"}");
     }
 
+    /**
+     * Generates a minimally valid BOLT11 invoice for testing purposes.
+     * Format: ln + currency + amount + separator + data + checksum
+     *
+     * This generates a mock invoice that passes basic Bech32 validation but is not
+     * cryptographically valid for actual Lightning Network payments.
+     */
+    private String generateValidBolt11Invoice() {
+        // Human-readable part: ln + bc (bitcoin mainnet) + 10n (10 nanosats = ~0 sats for testing)
+        String hrp = "lnbc10n";
+
+        // Generate random payment hash (32 bytes = 52 chars in bech32, roughly)
+        // For a minimal valid invoice, we need at least timestamp + payment hash
+        // Bech32 charset: qpzry9x8gf2tvdw0s3jn54khce6mua7l
+        StringBuilder data = new StringBuilder();
+
+        // Generate 52 random bech32 characters (represents ~32 bytes of data)
+        for (int i = 0; i < 52; i++) {
+            data.append(charset.charAt(SECURE_RANDOM.nextInt(charset.length())));
+        }
+
+        // Calculate and append Bech32 checksum (6 characters)
+        String checksum = calculateBech32Checksum(hrp, data.toString());
+
+        return hrp + "1" + data.toString() + checksum;
+    }
+
+    /**
+     * Calculates Bech32 checksum for the given HRP and data.
+     * Simplified implementation for mock purposes.
+     */
+    private String calculateBech32Checksum(String hrp, String data) {
+        // Expand HRP
+        int[] values = new int[hrp.length() * 2 + 1 + data.length() + 6];
+        int idx = 0;
+        for (int i = 0; i < hrp.length(); i++) {
+            values[idx++] = hrp.charAt(i) >> 5;
+        }
+        values[idx++] = 0;
+        for (int i = 0; i < hrp.length(); i++) {
+            values[idx++] = hrp.charAt(i) & 31;
+        }
+        for (int i = 0; i < data.length(); i++) {
+            values[idx++] = BECH32_CHARSET.indexOf(data.charAt(i));
+        }
+        for (int i = 0; i < 6; i++) {
+            values[idx++] = 0;
+        }
+
+        // Calculate checksum using Bech32 polymod
+        int polymod = polymod(values) ^ 1;
+
+        StringBuilder checksum = new StringBuilder();
+        for (int i = 0; i < 6; i++) {
+            checksum.append(BECH32_CHARSET.charAt((polymod >> (5 * (5 - i))) & 31));
+        }
+
+        return checksum.toString();
+    }
+
+    /**
+     * Bech32 polymod function for checksum calculation.
+     */
+    private int polymod(int[] values) {
+        int chk = 1;
+        for (int value : values) {
+            int top = chk >> 25;
+            chk = (chk & 0x1ffffff) << 5 ^ value;
+            for (int i = 0; i < 5; i++) {
+                if (((top >> i) & 1) != 0) {
+                    chk ^= BECH32_GENERATOR[i];
+                }
+            }
+        }
+        return chk;
+    }
+
     private void handleDecodeInvoice(HttpExchange exchange) throws IOException {
         writeJson(exchange, "{\"amount\":1000,\"description\":\"1 Blockaccino\"}");
     }
diff --git a/phoenixd-mock/target/classes/xyz/tcheeric/phoenixd/mock/Main.class b/phoenixd-mock/target/classes/xyz/tcheeric/phoenixd/mock/Main.class
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index 0000000..4ecc704
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diff --git a/phoenixd-mock/target/classes/xyz/tcheeric/phoenixd/mock/MockLnServer.class b/phoenixd-mock/target/classes/xyz/tcheeric/phoenixd/mock/MockLnServer.class
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index 0000000..c8436de
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diff --git a/phoenixd-mock/target/maven-status/maven-compiler-plugin/compile/default-compile/createdFiles.lst b/phoenixd-mock/target/maven-status/maven-compiler-plugin/compile/default-compile/createdFiles.lst
new file mode 100644
index 0000000..f7becd1
--- /dev/null
+++ b/phoenixd-mock/target/maven-status/maven-compiler-plugin/compile/default-compile/createdFiles.lst
@@ -0,0 +1,2 @@
+xyz/tcheeric/phoenixd/mock/MockLnServer.class
+xyz/tcheeric/phoenixd/mock/Main.class
diff --git a/phoenixd-mock/target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst b/phoenixd-mock/target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst
new file mode 100644
index 0000000..1616b0c
--- /dev/null
+++ b/phoenixd-mock/target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst
@@ -0,0 +1,2 @@
+/home/runner/work/phoenixd-java/phoenixd-java/phoenixd-mock/src/main/java/xyz/tcheeric/phoenixd/mock/MockLnServer.java
+/home/runner/work/phoenixd-java/phoenixd-java/phoenixd-mock/src/main/java/xyz/tcheeric/phoenixd/mock/Main.java