diff --git a/database.txt b/database.txt
index a15187c..3a524c7 100644
--- a/database.txt
+++ b/database.txt
@@ -98,7 +98,8 @@ CREATE TABLE customer (
     name VARCHAR(100),
     address TEXT,
     phone VARCHAR(20),
-    email VARCHAR(100)
+    email VARCHAR(100),
+    type VARCHAR(20),
 );
 
 CREATE TABLE sales_order (
@@ -109,10 +110,7 @@ CREATE TABLE sales_order (
     total_amount NUMERIC,
     note TEXT,
     payment_terms VARCHAR(100),
-    due_date DATE,
-    is_dp BOOLEAN,
-    dp_ammount NUMERIC,
-    dp_paid BOOLEAN
+    due_date DATE
 );
 
 CREATE TABLE sales_order_item (
@@ -121,7 +119,6 @@ CREATE TABLE sales_order_item (
     product_id INT REFERENCES master_product(id),
     quantity NUMERIC,
     unit_price NUMERIC,
-    discount NUMERIC,
     sub_total NUMERIC
 );
 
@@ -133,6 +130,7 @@ CREATE TABLE invoice (
     due_date DATE,
     status VARCHAR(50),
     total_amount NUMERIC,
+    note TEXT,
     is_dp_invoice BOOLEAN,
     is_full_invoice BOOLEAN,
     parent_invoice_id INT
@@ -144,16 +142,15 @@ CREATE TABLE invoice_line (
     product_id INT REFERENCES master_product(id),
     quantity NUMERIC,
     unit_price NUMERIC,
-    discount NUMERIC,
     sub_total NUMERIC
 );
 
 CREATE TABLE payment (
     id SERIAL PRIMARY KEY,
     invoice_id INT REFERENCES invoice(id),
-    payment_date DATE,
+    payment_at TIMESTAMP,
     amount NUMERIC,
     payment_method VARCHAR(100),
-    reference_number VARCHAR(100),
+    file_path VARCHAR(250),
     notes TEXT
 );
\ No newline at end of file
diff --git a/modules/sales/models/customer.go b/modules/sales/models/customer.go
index a8eb595..df3f0ff 100644
--- a/modules/sales/models/customer.go
+++ b/modules/sales/models/customer.go
@@ -8,6 +8,7 @@ type Customer struct {
 	Address string `json:"address"`
 	Phone   string `json:"phone"`
 	Email   string `json:"email"`
+	Type    string `json:"type"`
 
 	CreatedAt time.Time `json:"created_at"`
 	UpdatedAt time.Time `json:"updated_at"`
diff --git a/modules/sales/models/invoice.go b/modules/sales/models/invoice.go
index 7c53f67..2b905c6 100644
--- a/modules/sales/models/invoice.go
+++ b/modules/sales/models/invoice.go
@@ -3,13 +3,18 @@ package models
 import "time"
 
 type Invoice struct {
-	ID           uint      `gorm:"primaryKey" json:"id"`
-	SalesOrderID uint      `json:"sales_order_id"`
-	InvoiceDate  time.Time `json:"invoice_date"`
-	DueDate      time.Time `json:"due_date"`
-	TotalAmount  float64   `json:"total_amount"`
-	Status       string    `json:"status"` // contoh: unpaid, partial, paid
-	Note         string    `json:"note"`
+	ID              uint      `gorm:"primaryKey" json:"id"`
+	SalesOrderID    uint      `json:"sales_order_id"`
+	InvoiceNumber   string    `gorm:"not null;unique" json:"invoice_number"`
+	InvoiceDate     time.Time `json:"invoice_date"`
+	DueDate         time.Time `json:"due_date"`
+	TotalAmount     float64   `json:"total_amount"`
+	Status          string    `json:"status"` // contoh: unpaid, partial, paid
+	Note            string    `json:"note"`
+	IsDpInvoice     bool      `json:"is_dp_invoice"`               // Apakah ini invoice DP (Down Payment)
+	Amount          float64   `json:"amount"`                      // Jumlah DP jika ada
+	ParentInvoiceID uint      `json:"parent_invoice_id,omitempty"` // ID invoice induk jika ini adalah invoice lanjutan
+	ParentInvoice   *Invoice  `gorm:"foreignKey:ParentInvoiceID" json:"parent_invoice,omitempty"`
 
 	CreatedAt time.Time `json:"created_at"`
 	UpdatedAt time.Time `json:"updated_at"`
diff --git a/modules/sales/models/payment.go b/modules/sales/models/payment.go
index f775c4f..7d8721a 100644
--- a/modules/sales/models/payment.go
+++ b/modules/sales/models/payment.go
@@ -3,12 +3,13 @@ package models
 import "time"
 
 type Payment struct {
-	ID        uint      `gorm:"primaryKey" json:"id"`
-	InvoiceID uint      `json:"invoice_id"`
-	Amount    float64   `json:"amount"`
-	PaidAt    time.Time `json:"paid_at"`
-	Method    string    `json:"method"` // contoh: cash, bank transfer, credit card
-	Note      string    `json:"note"`
+	ID            uint      `gorm:"primaryKey" json:"id"`
+	InvoiceID     uint      `json:"invoice_id"`
+	Amount        float64   `json:"amount"`
+	PaymentAt     time.Time `json:"payment_at"`
+	PaymentMethod string    `json:"payment_method"` // contoh: cash, bank transfer, credit card
+	FilePath      string    `json:"file_path"`      // Path ke file bukti pembayaran
+	Note          string    `json:"note"`
 
 	CreatedAt time.Time `json:"created_at"`
 	UpdatedAt time.Time `json:"updated_at"`
diff --git a/modules/sales/models/sales_order.go b/modules/sales/models/sales_order.go
index c958f77..cd696f7 100644
--- a/modules/sales/models/sales_order.go
+++ b/modules/sales/models/sales_order.go
@@ -11,8 +11,6 @@ type SalesOrder struct {
 	Note         string    `json:"note"`
 	PaymentTerms string    `json:"payment_terms"`
 	DueDate      time.Time `json:"due_date"`
-	DPAmount     float64   `json:"dp_amount"`
-	DPPaid       float64   `json:"dp_paid"`
 
 	CreatedAt time.Time `json:"created_at"`
 	UpdatedAt time.Time `json:"updated_at"`