PDF Tools API

发票生成 API

Q: 发票生成 API 怎么计费？

成功的 发票生成 API 请求会消耗 API Credits；失败处理会自动退回。每个登录用户每月有 100 个免费 API Credits，1,000 Credits = $1。

在后端、批处理或产品流程中生成发票 PDF，不必自己维护 PDF 处理基础设施；成功请求按 Credits 计费。

Create API Key Read full API docs

Credits

1 Credit / call

1 Credit per successful API request. Failed processing attempts are refunded automatically.

Pricing

1,000 Credits = $1

Every signed-in user receives 100 free API Credits each month.

Endpoint

/api/external/invoice-generator/pdf

Use your API Key in the x-api-key header.

Use case

适合把账单系统、后台管理或自动化流程中的发票 JSON 转成 PDF。网页工具用于人工处理，API 用于稳定的服务端自动化。

cURL example

curl -X POST https://itextmaster.com/api/external/invoice-generator/pdf \
  -H 'x-api-key: YOUR_API_KEY' \
  -F 'invoiceNumber=INV-001' \
  -F 'fromName=Your Company' \
  -F 'billToName=Client Name' \
  -F 'items=[{"description":"Consulting","quantity":10,"rate":150}]' \
  --output invoice.pdf

Multipart example

curl -X POST https://itextmaster.com/api/external/invoice-generator/pdf \
  -H 'x-api-key: YOUR_API_KEY' \
  -F 'invoiceNumber=INV-001' \
  -F 'fromName=Your Company' \
  -F 'billToName=Client Name' \
  -F 'items=[{"description":"Consulting","quantity":10,"rate":150}]' \
  --output invoice.pdf

JSON base64 example

curl -X POST https://itextmaster.com/api/external/invoice-generator/pdf \
  -H 'Content-Type: application/json' \
  -H 'x-api-key: YOUR_API_KEY' \
  -d '{
    "invoiceNumber": "INV-001",
    "from": { "name": "Your Company", "email": "you@example.com" },
    "billTo": { "name": "Client Name", "email": "client@example.com" },
    "items": [{ "description": "Consulting", "quantity": 10, "rate": 150 }]
  }' \
  --output invoice.pdf

Node.js example

import { writeFile } from 'node:fs/promises';

const response = await fetch('https://itextmaster.com/api/external/invoice-generator/pdf', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'x-api-key': process.env.ITEXTMASTER_API_KEY
  },
  body: JSON.stringify({
  invoiceNumber: 'INV-001',
  from: { name: 'Your Company', email: 'you@example.com' },
  billTo: { name: 'Client Name', email: 'client@example.com' },
  items: [{ description: 'Consulting', quantity: 10, rate: 150 }]
})
});

if (!response.ok) {
  throw new Error(await response.text());
}

await writeFile('invoice.pdf', Buffer.from(await response.arrayBuffer()));

Python example

import os
import requests

response = requests.post(
    'https://itextmaster.com/api/external/invoice-generator/pdf',
    headers={
        'Content-Type': 'application/json',
        'x-api-key': os.environ['ITEXTMASTER_API_KEY'],
    },
    json={
        'invoiceNumber': 'INV-001',
        'from': {'name': 'Your Company', 'email': 'you@example.com'},
        'billTo': {'name': 'Client Name', 'email': 'client@example.com'},
        'items': [{'description': 'Consulting', 'quantity': 10, 'rate': 150}],
    },
)
response.raise_for_status()

with open('invoice.pdf', 'wb') as f:
    f.write(response.content)

Error codes

400invalid_invoice_payload

发票 JSON 格式错误或缺少必填字段。

401invalid_api_key

x-api-key 缺失、无效或已经轮换。

402insufficient_credits

账号 API Credits 不足。

500invoice_pdf_generation_failed

发票 PDF 渲染失败；失败处理会自动退回 Credits。

Limits

需要可正常打开的 PDF 或有效输入数据。
请从服务端调用 API，不要在浏览器暴露 API Key。
复杂文件建议先用代表性样本测试输出质量。

Response headers

invoice.pdf，响应头会返回本次消耗的 Credits 和剩余额度。

Content-Type: 生成文件的 MIME 类型，通常是 application/pdf 或 application/zip。
Content-Disposition: 生成文件的下载文件名。
X-Credits-Charged: 成功请求实际扣除的 Credits。
X-Credit-Balance: 请求完成后的剩余 API Credits。

FAQ