diff --git a/backend/src/app.ts b/backend/src/app.ts
index e519272..219bab5 100644
--- a/backend/src/app.ts
+++ b/backend/src/app.ts
@@ -144,7 +144,20 @@ app.use(route.post('/invoice', async (ctx) => {
 }))
 
 app.use(route.get('/invoice/INV-:date(\\d{8})-:suffix(\\d+)', async (ctx, invoiceId, suffix) => {
-	ctx.body = `Invoice ID: INV-${invoiceId}-${suffix}`
+	// 请求头验证 bearer token
+	const bearerToken = ctx.request.headers['authorization']?.split(' ')
+	if (!bearerToken) throw new HttpError(ErrorDescEnum.unauthorized, 401)
+	if (bearerToken[0] !== 'Bearer') throw new HttpError(ErrorDescEnum.unauthorized, 401)
+	if (!bearerToken[1]) throw new HttpError(ErrorDescEnum.unauthorized, 401)
+	await func.verifyBearerToken(bearerToken[1])
+
+	// 验证 invoiceId 格式
+	const date = invoiceId.slice(0, 4) + '-' + invoiceId.slice(4, 6) + '-' + invoiceId.slice(6, 8)
+	
+	// 获取特定收据
+	const invoice = await func.getSpecificInvoice(ctx.prisma, date, parseInt(suffix))
+	console.log(invoice.exportJSON())
+	ctx.body = invoice.exportJSON()
 }))
 
 const port = parseInt(process.env.PORT ?? '3000')
diff --git a/backend/src/classes/Invoice.ts b/backend/src/classes/Invoice.ts
index 4f530aa..0b747b1 100644
--- a/backend/src/classes/Invoice.ts
+++ b/backend/src/classes/Invoice.ts
@@ -19,6 +19,8 @@ class Invoice {
 		this.suffixCode = suffixCode
 		// 设置签发时间
 		this.issueTime = issueDate
+		// 设置为当天零点零秒
+		this.issueTime.setHours(0, 0, 0, 0)
 		// 设置账单周期
 		console.log(period)
 		// 首先验证周期有两个日期，且第一个日期早于第二个日期
@@ -154,6 +156,23 @@ class Invoice {
 			}))
 		}
 	}
+
+	/**
+	 * 导出为 JSON
+	 * @returns JSON 格式的收据
+	 */
+	exportJSON() {
+		return {
+			invoiceNumber: `INV-${this.issueTime.getFullYear()}${(this.issueTime.getMonth() + 1).toString().padStart(2, '0')}${this.issueTime.getDate().toString().padStart(2, '0')}-${this.suffixCode}`,
+			periodStart: this.period[0],
+			periodEnd: this.period[1],
+			items: this.items.map(item => item.exportJSON()),
+			dueDate: this.dueDate,
+			payerInfoSnap: this.payer,
+			payerId: this.payer.id,
+			note: this.note
+		}
+	}
 }
 
 export default Invoice
\ No newline at end of file
diff --git a/backend/src/classes/InvoiceItem.ts b/backend/src/classes/InvoiceItem.ts
index 99fcd46..a941174 100644
--- a/backend/src/classes/InvoiceItem.ts
+++ b/backend/src/classes/InvoiceItem.ts
@@ -48,6 +48,19 @@ class InvoiceItem {
 	getSubtotal() {
 		return (this.unitPrice ? Number(this.unitPrice) : 0) * (this.quantity ?? 0);
 	}
+
+	/**
+	 * 导出为 JSON 对象。
+	 */
+	exportJSON() {
+		return {
+			id: this.id,
+			description: this.description,
+			quantity: this.quantity,
+			unit: this.unit,
+			unitPrice: this.unitPrice?.toNumber()
+		}
+	}
 }
 
 export default InvoiceItem
\ No newline at end of file
diff --git a/backend/src/func/getSpecificInvoice.ts b/backend/src/func/getSpecificInvoice.ts
new file mode 100644
index 0000000..14a7811
--- /dev/null
+++ b/backend/src/func/getSpecificInvoice.ts
@@ -0,0 +1,44 @@
+import { PrismaClient } from '@prisma/client'
+import dayjs from 'dayjs'
+import { ErrorDescEnum, HttpError } from '../classes/HttpError'
+import Invoice from '../classes/Invoice'
+import InvoiceItem from '../classes/InvoiceItem'
+
+export default async (prisma: PrismaClient, invoiceIssueDateString: string, invoiceSuffix: number) => {
+	const invoiceIssueDate = dayjs(invoiceIssueDateString, 'YYYYMMDD').toDate()
+
+	const invoice = await prisma.invoice.findUnique({
+		where: {
+			invoice_date_invoice_suffix_code: {
+				invoice_date: invoiceIssueDate,
+				invoice_suffix_code: invoiceSuffix
+			}
+		}
+	})
+	console.log(invoiceIssueDate, invoiceSuffix)
+	console.log(invoice)
+	if (!invoice) throw new HttpError(ErrorDescEnum.related_item_not_found, 404)
+	
+	const items = await prisma.invoiceItem.findMany({
+		where: {
+			invoice_suffix_code: invoiceSuffix,
+			invoice_date: invoiceIssueDate
+		}
+	})
+
+	const payer = {
+		id: invoice.payer_id,
+		name: invoice.invoice_payer_name,
+		address: invoice.invoice_payer_address,
+		abn: invoice.invoice_payer_abn ?? undefined
+	}
+
+	const invoiceItems = items.map(item => {
+		return new InvoiceItem(item.item_id, item.item_description, item.item_quantity, item.item_unit, item.item_unit_price)
+	})
+
+	const invoiceInstance = new Invoice(invoice.invoice_suffix_code, invoice.invoice_date, [invoice.invoice_billing_period_start, invoice.invoice_billing_period_end], invoiceItems, invoice.invoice_due_date, payer)
+	if (invoice.invoice_note) await invoiceInstance.setNote(invoice.invoice_note)
+
+	return invoiceInstance
+}
\ No newline at end of file
diff --git a/backend/src/func/index.ts b/backend/src/func/index.ts
index 4e38775..bde06ae 100644
--- a/backend/src/func/index.ts
+++ b/backend/src/func/index.ts
@@ -1,9 +1,11 @@
 import createPayer from "./createPayer"
 import issueInvoice from "./issueInvoice"
 import verifyBearerToken from "./verifyBearerToken"
+import getSpecificInvoice from "./getSpecificInvoice"
 
 export default {
 	createPayer,
 	issueInvoice,
-	verifyBearerToken
+	verifyBearerToken,
+	getSpecificInvoice
 }
\ No newline at end of file