diff --git a/.forge/iss-5a912ed79baf-attempt-2.md b/.forge/iss-5a912ed79baf-attempt-2.md
deleted file mode 100644
index 59e7abd..0000000
--- a/.forge/iss-5a912ed79baf-attempt-2.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# iss-5a912ed79baf-attempt-2
-
-Forge 이슈 작업 브랜치 `forge/iss-5a912ed79baf-attempt-2`.
diff --git a/.forge/iss-5a912ed79baf-attempt-3.md b/.forge/iss-5a912ed79baf-attempt-3.md
new file mode 100644
index 0000000..f95f3fb
--- /dev/null
+++ b/.forge/iss-5a912ed79baf-attempt-3.md
@@ -0,0 +1,3 @@
+# iss-5a912ed79baf-attempt-3
+
+Forge 이슈 작업 브랜치 `forge/iss-5a912ed79baf-attempt-3`.
diff --git a/.forge/iss-87190c9836ac-attempt-1.md b/.forge/iss-87190c9836ac-attempt-1.md
new file mode 100644
index 0000000..af8e790
--- /dev/null
+++ b/.forge/iss-87190c9836ac-attempt-1.md
@@ -0,0 +1,3 @@
+# iss-87190c9836ac-attempt-1
+
+Forge 이슈 작업 브랜치 `forge/iss-87190c9836ac-attempt-1`.
diff --git a/docs/architecture/package-map.md b/docs/architecture/package-map.md
new file mode 100644
index 0000000..c8762cf
--- /dev/null
+++ b/docs/architecture/package-map.md
@@ -0,0 +1,9 @@
+# Package Responsibility Map
+
+| Package        | Responsibility                                  | Forbidden Dependencies |
+|----------------|------------------------------------------------|------------------------|
+| controller     | Handles user input and orchestrates payment    | domain                 |
+| service        | Contains business logic for payment processing  | integration            |
+| repository     | Data access layer for payment records           | service                |
+| domain         | Defines the core domain models and business rules| controller             |
+| integration     | Communicates with external payment gateways     | domain, service        |
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diff --git a/docs/architecture/transaction-sequence.md b/docs/architecture/transaction-sequence.md
index 22984f9..4d3460a 100644
--- a/docs/architecture/transaction-sequence.md
+++ b/docs/architecture/transaction-sequence.md
@@ -1,23 +1,38 @@
 ```mermaid
 sequenceDiagram
     participant User
+    participant PaymentService
     participant PaymentGateway
     participant Database
 
-    User->>PaymentGateway: Initiate payment
-    PaymentGateway->>User: Payment status (success)
-    User->>Database: Save transaction
-    Database-->>User: Transaction saved
+    %% Normal Flow
+    User->>PaymentService: Initiate Payment
+    PaymentService->>Database: Store Transaction
+    Database-->>PaymentService: Transaction Stored
+    PaymentService->>PaymentGateway: Process Payment
+    PaymentGateway-->>PaymentService: Payment Success
+    PaymentService->>Database: Update Transaction Status
+    Database-->>PaymentService: Transaction Updated
+    PaymentService-->>User: Payment Success
 
-    %% External failure scenario
-    User->>PaymentGateway: Initiate payment
-    PaymentGateway-->>User: Payment status (failure)
-    User->>Database: Log failure reason
+    %% External Failure Flow
+    User->>PaymentService: Initiate Payment
+    PaymentService->>Database: Store Transaction
+    Database-->>PaymentService: Transaction Stored
+    PaymentService->>PaymentGateway: Process Payment
+    PaymentGateway-->>PaymentService: Payment Failure
+    PaymentService->>Database: Rollback Transaction
+    Database-->>PaymentService: Transaction Rolled Back
+    PaymentService-->>User: Payment Failure
 
-    %% Database failure scenario
-    User->>PaymentGateway: Initiate payment
-    PaymentGateway->>User: Payment status (success)
-    User->>Database: Save transaction
-    Database-->>User: Transaction failed (DB error)
-    Note right of User: Rollback transaction
+    %% DB Failure Flow
+    User->>PaymentService: Initiate Payment
+    PaymentService->>Database: Store Transaction
+    Database-->>PaymentService: Transaction Store Failure
+    PaymentService-->>User: Payment Failure
+
+    %% Commit & Rollback
+    Note over User, PaymentService: 
+    commit --> PaymentService
+    rollback --> PaymentService
 ```
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