Invoice Generator API Reference

Overview

Invoice Generator works by analyzing the data provided and generating an invoice. It uses various sources to determine the data and returns a PDF of the generated invoice.

Endpoint

One host, one path per API. The block below shows this call in four languages; every one of them is the same HTTP request. Making requests covers the timeouts, retries and parameter rules that apply to all of them. The SDKs wrap the same call in a typed client.

POSThttps://api.apiverve.com/v1/invoicegenerator

curl -X POST https://api.apiverve.com/v1/invoicegenerator \
  -H "x-api-key: your_api_key_here" \
  -H "Content-Type: application/json" \
  -d '{
  "invoiceNumber": "INV000001",
  "date": "2025-02-01",
  "dueDate": "2025-11-30",
  "from_name": "John Doe",
  "from_street": "123 Elm St",
  "from_city": "Springfield",
  "from_state": "IL",
  "from_zip": "62701",
  "to_name": "Jane Smith",
  "to_street": "456 Oak St",
  "to_city": "Springfield",
  "to_state": "IL",
  "to_zip": "62702",
  "job": "Web Development",
  "paymentTerms": "Net 30",
  "discount": 10,
  "salesTax": 37.07,
  "currency": "USD",
  "items": [
    {
      "qty": 2,
      "description": "Web Design Services",
      "unit_price": 500
    },
    {
      "qty": 1,
      "description": "Domain Registration",
      "unit_price": 100
    }
  ]
}'

const res = await fetch('https://api.apiverve.com/v1/invoicegenerator', {
  method: 'POST',
  headers: {
    'x-api-key': 'your_api_key_here',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
  "invoiceNumber": "INV000001",
  "date": "2025-02-01",
  "dueDate": "2025-11-30",
  "from_name": "John Doe",
  "from_street": "123 Elm St",
  "from_city": "Springfield",
  "from_state": "IL",
  "from_zip": "62701",
  "to_name": "Jane Smith",
  "to_street": "456 Oak St",
  "to_city": "Springfield",
  "to_state": "IL",
  "to_zip": "62702",
  "job": "Web Development",
  "paymentTerms": "Net 30",
  "discount": 10,
  "salesTax": 37.07,
  "currency": "USD",
  "items": [
    {
      "qty": 2,
      "description": "Web Design Services",
      "unit_price": 500
    },
    {
      "qty": 1,
      "description": "Domain Registration",
      "unit_price": 100
    }
  ]
}),
});

if (!res.ok) throw new Error(`${res.status} ${await res.text()}`);

const { data } = await res.json();
console.log(data);

import requests

res = requests.post(
    "https://api.apiverve.com/v1/invoicegenerator",
    headers={"x-api-key": "your_api_key_here"},
    json={
    "invoiceNumber": "INV000001",
    "date": "2025-02-01",
    "dueDate": "2025-11-30",
    "from_name": "John Doe",
    "from_street": "123 Elm St",
    "from_city": "Springfield",
    "from_state": "IL",
    "from_zip": "62701",
    "to_name": "Jane Smith",
    "to_street": "456 Oak St",
    "to_city": "Springfield",
    "to_state": "IL",
    "to_zip": "62702",
    "job": "Web Development",
    "paymentTerms": "Net 30",
    "discount": 10,
    "salesTax": 37.07,
    "currency": "USD",
    "items": [
        {
            "qty": 2,
            "description": "Web Design Services",
            "unit_price": 500
        },
        {
            "qty": 1,
            "description": "Domain Registration",
            "unit_price": 100
        }
    ]
},
    timeout=15,
)
res.raise_for_status()

print(res.json()["data"])

package main

import (
	"fmt"
	"io"
	"net/http"
	"strings"
)

func main() {
	body := strings.NewReader(`{
  "invoiceNumber": "INV000001",
  "date": "2025-02-01",
  "dueDate": "2025-11-30",
  "from_name": "John Doe",
  "from_street": "123 Elm St",
  "from_city": "Springfield",
  "from_state": "IL",
  "from_zip": "62701",
  "to_name": "Jane Smith",
  "to_street": "456 Oak St",
  "to_city": "Springfield",
  "to_state": "IL",
  "to_zip": "62702",
  "job": "Web Development",
  "paymentTerms": "Net 30",
  "discount": 10,
  "salesTax": 37.07,
  "currency": "USD",
  "items": [
    {
      "qty": 2,
      "description": "Web Design Services",
      "unit_price": 500
    },
    {
      "qty": 1,
      "description": "Domain Registration",
      "unit_price": 100
    }
  ]
}`)
	req, _ := http.NewRequest("POST", "https://api.apiverve.com/v1/invoicegenerator", body)
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("x-api-key", "your_api_key_here")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()

	out, _ := io.ReadAll(res.Body)
	fmt.Println(string(out))
}

Replace your_api_key_here with the key from your dashboard. When the inputs arrive as a list rather than one at a time, batch requests run up to 200 of them through this same API in a single call.

Authentication

Send your key in the x-api-key header. That is the only auth step — there is no token exchange and no per-endpoint scope to configure. Authentication covers creating, rotating and revoking keys.

401 is the only auth verdict

A 401 means the key is missing, invalid or expired. A 403 means the key is valid but not permitted here — blocked by a key restriction or an IP allow-list. Running out of credits is a 429.

Parameters

Sent as JSON in the request body. Premium parameters are accepted on every plan but only take effect on plans that include them.

Parameter	Type	Description
`invoiceNumber`Required	string	The invoice number
`date`Optional	string	The invoice date (YYYY-MM-DD format) date
`from_name`Required	string	The name of the person or company issuing the invoice
`from_street`Required	string	The street address of the person or company issuing the invoice
`from_city`Required	string	The city of the person or company issuing the invoice
`from_state`Required	string	The state of the person or company issuing the invoice length 0–2
`from_zip`Required	string	The zip code of the person or company issuing the invoice length 5–10
`to_name`Required	string	The name of the person or company being invoiced
`to_street`Required	string	The street address of the person or company being invoiced
`to_city`Required	string	The city of the person or company being invoiced
`to_state`Required	string	The state of the person or company being invoiced length 0–2
`to_zip`Required	string	The zip code of the person or company being invoiced length 5–10
`job`Optional	string	The job or project associated with the invoice
`paymentTerms`Optional	string	The payment terms for the invoice
`dueDate`Optional	string	The due date for the invoice (YYYY-MM-DD format) date
`discount`Optional	number	The discount to be applied to the invoice range 0–∞
`salesTax`Optional	number	The sales tax rate for the invoice (as percentage) range 0–100
`currency`Optional	string	The currency for the invoice
`items`Required	array	The items being invoiced (qty, description, unit_price)

Response

Every API returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape. Response format covers the envelope, the other output formats and how premium fields are withheld.

Sample response

{
  "status": "ok",
  "error": null,
  "data": {
    "pdfName": "fc17c4bd-e660-4078-94ae-f46be56c9006.pdf",
    "expires": 1766096689189,
    "downloadURL": "https://storage.googleapis.com/apiverve-helpers.appspot.com/htmltopdf/fc17c4bd-e660-4078-94ae-f46be56c9006.pdf?GoogleAccessId=1089020767582-compute%40developer.gserviceaccount.com&Expires=1766096689&Signature=zZYB17Rj1yfbfhM3Epmjc9PEfmsVpgsCATX5%2Bx2yAo%2FV45xUatVzkAjUkPC48PkR4m%2BF7uIJBToUY2QAZMzNIOre4T0Md2eToXtcYF%2F%2FefS3sZocODRdiC%2BmEuMZjsAPMfkhbCMQZT4lZczQn9sfaWJlWJi%2FGWXKVUwZby3yn06Ed7OqianYbxQj87ENoqYudZFe5qFpI0hmwh4lBrnIM40hb4eZwwbGEvZL2WejNdBgD0cKb3C%2BHwJHkPvd2PAzFfNvuJolBxMN4jE3QCx9DN2MdHGUqb7t3vlP0Kder8m0lMpac%2BPbwZsDVmlF595cFzkKaE928uxzA1Mzkenffg%3D%3D"
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Field	Type	Example	Description
`pdfName`	string	`"fc17c4bd-e660-4078-94ae-f46be56c9006.pdf"`	Unique filename of generated PDF document
`expires`	number	`1766096689189`	Unix timestamp when PDF link expires and is deleted
`downloadURL`	string	"https://storage.googleapis.com/apiverve-helpers.appspot.com/htmltopdf/fc17c4bd-e660-4078-94ae-f46be56c9006.pdf?GoogleAccessId=1089020767582-compute%40developer.gserviceaccount.com&Expires=1766096689&Signature=zZYB17Rj1yfbfhM3Epmjc9PEfmsVpgsCATX5%2Bx2yAo%2FV45xUatVzkAjUkPC48PkR4m%2BF7uIJBToUY2QAZMzNIOre4T0Md2eToXtcYF%2F%2FefS3sZocODRdiC%2BmEuMZjsAPMfkhbCMQZT4lZczQn9sfaWJlWJi%2FGWXKVUwZby3yn06Ed7OqianYbxQj87ENoqYudZFe5qFpI0hmwh4lBrnIM40hb4eZwwbGEvZL2WejNdBgD0cKb3C%2BHwJHkPvd2PAzFfNvuJolBxMN4jE3QCx9DN2MdHGUqb7t3vlP0Kder8m0lMpac%2BPbwZsDVmlF595cFzkKaE928uxzA1Mzkenffg%3D%3D"	Temporary download URL for generated PDF invoice

Errors

Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change. Error handling covers the full status list and which of them are worth retrying.

Status	Meaning	What to do
`400`	Input was rejected	Read `error`; it names the parameter.
`401`	Key missing or invalid	Check the header name and the key value.
`403`	Key valid, but not permitted	A key restriction or IP allow-list; see key scoping.
`429`	Rate limited, or out of credits	Read `error` to tell them apart; see rate limits.

Other ways to use Invoice Generator

Set up Invoice Generator on APIVerve, or reach the same source a different way. Your APIVerve account and credits work on all of them — one key, one balance.

Give it to an AI agentConnect over MCP and your agent calls it as a native tool — Claude, Cursor, ChatGPT.VerveKit →Reference →

Invoice Generator