diff --git a/erp/payment/payment.go b/erp/payment/payment.go
index 7d086fc..140c47d 100644
--- a/erp/payment/payment.go
+++ b/erp/payment/payment.go
@@ -1,5 +1,6 @@
 package payment
 
 type Payment struct {
-	Audit audit
+	Audit   audit
+	Prepaid prepaid
 }
diff --git a/erp/payment/prepaid.go b/erp/payment/prepaid.go
new file mode 100644
index 0000000..8adfa07
--- /dev/null
+++ b/erp/payment/prepaid.go
@@ -0,0 +1,77 @@
+package payment
+
+import (
+	"context"
+	"time"
+
+	"git.kumo.work/shama/service/client"
+	"github.com/shopspring/decimal"
+)
+
+type prepaid struct {
+}
+
+type PrepaidItem struct {
+	Id            int64           `json:"id"`
+	InvoiceSerial string          `json:"invoiceSerial"`
+	Amount        decimal.Decimal `json:"amount"`
+	Remark        string          `json:"remark"`
+	CreatedAt     *time.Time      `json:"createdAt"`
+	UpdatedAt     *time.Time      `json:"updatedAt"`
+}
+
+// All @TITLE 获取费用
+func (c *prepaid) All(ctx context.Context, paymentId int64) (reply []PrepaidItem, err error) {
+	xClient, err := client.GetClient(c)
+	if err != nil {
+		return
+	}
+	err = xClient.Call(ctx, "All", paymentId, &reply)
+	return
+}
+
+type ArgsPrepaidAdd struct {
+	PurchaseId int64 // 采购合同ID
+	PrepaidAdd
+}
+
+type PrepaidAdd struct {
+	InvoiceSerial string          // 发票编号
+	Amount        decimal.Decimal // 金额
+	Remark        string          // 备注
+}
+
+// Add @TITLE 添加费用
+func (c *prepaid) Add(ctx context.Context, args ArgsPrepaidAdd) (err error) {
+	xClient, err := client.GetClient(c)
+	if err != nil {
+		return
+	}
+	reply := 0
+	return xClient.Call(ctx, "Add", args, &reply)
+}
+
+type ArgsPrepaidEdit struct {
+	PrepaidId int64 // 费用ID
+	PrepaidAdd
+}
+
+// Edit @TITLE 编辑费用
+func (c *prepaid) Edit(ctx context.Context, args ArgsPrepaidEdit) (err error) {
+	xClient, err := client.GetClient(c)
+	if err != nil {
+		return
+	}
+	reply := 0
+	return xClient.Call(ctx, "Edit", args, &reply)
+}
+
+// Delete @TITLE 删除费用
+func (c *prepaid) Delete(ctx context.Context, prepaidIds []int64) (err error) {
+	xClient, err := client.GetClient(c)
+	if err != nil {
+		return
+	}
+	reply := 0
+	return xClient.Call(ctx, "Delete", prepaidIds, &reply)
+}