diff --git a/src/services/flowaccount.ts b/src/services/flowaccount.ts
index a3a02d3..5bdb0c9 100644
--- a/src/services/flowaccount.ts
+++ b/src/services/flowaccount.ts
@@ -1,3 +1,6 @@
+import prisma from "../db";
+import config from "../config.json";
+
 if (!process.env.FLOW_ACCOUNT_URL) throw new Error("Require FLOW_ACCOUNT_URL");
 if (!process.env.FLOW_ACCOUNT_CLIENT_ID) throw new Error("Require FLOW_ACCOUNT_CLIENT_ID");
 if (!process.env.FLOW_ACCOUNT_CLIENT_SECRET) throw new Error("Require FLOW_ACCOUNT_CLIENT_SECRET");
@@ -15,6 +18,9 @@ const clientScope = process.env.FLOW_ACCOUNT_CLIENT_SCOPE;
 let token: string = "";
 let tokenExpire: number = Date.now();
 
+// float 0.0 - 1.0
+const VAT_DEFAULT = config.vat;
+
 enum ContactGroup {
   PERS = 1,
   CORP = 3,
@@ -52,11 +58,13 @@ type ProductAndService = {
   unitName?: string;
   pricePerUnit: number;
   total: number;
+  discountAmount?: number;
+  vatRate?: number;
   sellChartOfAccountCode?: string;
   buyChartOfAccountcode?: string;
 };
 
-const flowaccount = {
+const flowAccountAPI = {
   auth: async () => {
     // Get new token if it is expiring soon (30s).
     if (token && Date.now() < tokenExpire + 30 * 1000) return { token, tokenExpire };
@@ -89,7 +97,7 @@ const flowaccount = {
     return { token, tokenExpire };
   },
 
-  createInvoice: async (
+  async createInvoice(
     data: {
       recordId?: string;
       contactCode?: string;
@@ -138,8 +146,8 @@ const flowaccount = {
       items: ProductAndService[];
     },
     withPayment?: boolean,
-  ) => {
-    const { token } = await flowaccount.auth();
+  ) {
+    const { token } = await flowAccountAPI.auth();
 
     if (data.publishedOn instanceof Date) {
       let date = data.publishedOn.getDate();
@@ -155,7 +163,7 @@ const flowaccount = {
       data.dueDate = `${year}-${String(month).padStart(2, "0")}-${String(date).padStart(2, "0")}`;
     }
 
-    const res = await fetch(api + "/tax-invoices" + withPayment ? "/with-payment" : "", {
+    const res = await fetch(api + "/tax-invoices/inline" + withPayment ? "/with-payment" : "", {
       method: "POST",
       headers: {
         ["Content-Type"]: `application/json`,
@@ -165,10 +173,136 @@ const flowaccount = {
     });
 
     return {
+      ok: res.ok,
+      status: res.status,
+      body: await res.json(),
+    };
+  },
+
+  async getInvoiceDocument(recordId: string) {
+    const res = await fetch(api + "tax-invoices/shareddocument", {
+      method: "POST",
+      headers: {
+        ["Content-Type"]: `application/json`,
+        ["Authorization"]: `Bearer ${token}`,
+      },
+      body: JSON.stringify({
+        recordId,
+        culture: "th",
+      }),
+    });
+
+    return {
+      ok: res.ok,
       status: res.status,
       body: await res.json(),
     };
   },
 };
 
-export default flowaccount;
+const flowAccount = {
+  issueInvoiceWithPayment: async (invoiceId: string) => {
+    const data = await prisma.invoice.findFirst({
+      where: { id: invoiceId },
+      include: {
+        quotation: {
+          include: {
+            registeredBranch: {
+              include: {
+                province: true,
+                district: true,
+                subDistrict: true,
+              },
+            },
+            productServiceList: {
+              include: {
+                worker: true,
+                service: true,
+                work: true,
+                product: true,
+              },
+            },
+            customerBranch: {
+              include: { customer: true, province: true, district: true, subDistrict: true },
+            },
+            createdBy: true,
+            updatedBy: true,
+          },
+        },
+        payment: true,
+      },
+    });
+
+    if (!data) return null;
+
+    const quotation = data.quotation;
+    const customer = quotation.customerBranch;
+    const branch = quotation.registeredBranch;
+    const product = quotation.productServiceList;
+
+    return await flowAccountAPI.createInvoice(
+      {
+        contactCode: customer.code,
+        contactName: [customer.firstName, customer.lastName].join(" "),
+        contactAddress: [
+          customer.address,
+          !!customer.moo ? "หมู่" + customer.moo : null,
+          !!customer.soi ? "ซอย" + customer.soi : null,
+          !!customer.street ? "ถนน" + customer.street : null,
+          (customer.province?.id === "10" ? "แขวง" : "อำเภอ") + customer.subDistrict?.name,
+          (customer.province?.id === "10" ? "เขต" : "ตำบล") + customer.district?.name,
+          customer.province?.name,
+          customer.subDistrict?.zipCode,
+        ]
+          .filter(Boolean)
+          .join(" "),
+        contactTaxId: customer.citizenId || customer.code,
+        contactBranch: customer.authorizedName ?? undefined,
+        contactPerson: branch.contactName ?? undefined,
+        contactEmail: branch.email,
+        contactNumber: branch.telephoneNo,
+        contactZipCode: branch.subDistrict?.zipCode,
+        contactGroup:
+          customer.customer.customerType === "PERS" ? ContactGroup.PERS : ContactGroup.CORP,
+        dueDate: quotation.dueDate,
+        salesName: [quotation.createdBy?.firstName, quotation.createdBy?.lastName].join(" "),
+
+        isVatInclusive: true,
+        isVat: true,
+
+        useReceiptDeduction: true,
+
+        discounPercentage: 0,
+        discountAmount: quotation.totalDiscount,
+
+        subTotal: quotation.totalPrice,
+        totalAfterDiscount: quotation.finalPrice,
+        vatAmount: quotation.vat,
+        grandTotal: quotation.finalPrice,
+
+        items: product.map((v) => ({
+          type: ProductAndServiceType.ProductNonInv,
+          name: v.product.name,
+          pricePerUnit: v.pricePerUnit,
+          quantity: v.amount,
+          discountAmount: v.discount,
+          total: (v.pricePerUnit - (v.discount || 0)) * v.amount + v.vat,
+          vatRate: VAT_DEFAULT * 100,
+        })),
+      },
+      true,
+    );
+  },
+
+  getInvoiceDocument: async (recordId: string) => {
+    const ret = await flowAccountAPI.getInvoiceDocument(recordId);
+
+    if (ret && ret.ok) {
+      return ret.body.data.link;
+    }
+
+    return null;
+  },
+};
+
+export default flowAccount;