Create customer

POST

customers

Create a Customer

curl --request POST \
  --url https://api.taxwire.com/customers \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "source_id": "CUS-1042",
  "source": "taxwire",
  "source_account_id": "__default__",
  "name": "Acme Wholesale",
  "email": "ap@acme.example",
  "source_updated_at": "2026-09-14T19:58:12Z"
}
'

import requests

url = "https://api.taxwire.com/customers"

payload = {
    "source_id": "CUS-1042",
    "source": "taxwire",
    "source_account_id": "__default__",
    "name": "Acme Wholesale",
    "email": "ap@acme.example",
    "source_updated_at": "2026-09-14T19:58:12Z"
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    source_id: 'CUS-1042',
    source: 'taxwire',
    source_account_id: '__default__',
    name: 'Acme Wholesale',
    email: 'ap@acme.example',
    source_updated_at: '2026-09-14T19:58:12Z'
  })
};

fetch('https://api.taxwire.com/customers', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.taxwire.com/customers",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'source_id' => 'CUS-1042',
    'source' => 'taxwire',
    'source_account_id' => '__default__',
    'name' => 'Acme Wholesale',
    'email' => 'ap@acme.example',
    'source_updated_at' => '2026-09-14T19:58:12Z'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

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

func main() {

	url := "https://api.taxwire.com/customers"

	payload := strings.NewReader("{\n  \"source_id\": \"CUS-1042\",\n  \"source\": \"taxwire\",\n  \"source_account_id\": \"__default__\",\n  \"name\": \"Acme Wholesale\",\n  \"email\": \"ap@acme.example\",\n  \"source_updated_at\": \"2026-09-14T19:58:12Z\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-API-Key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.taxwire.com/customers")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"source_id\": \"CUS-1042\",\n  \"source\": \"taxwire\",\n  \"source_account_id\": \"__default__\",\n  \"name\": \"Acme Wholesale\",\n  \"email\": \"ap@acme.example\",\n  \"source_updated_at\": \"2026-09-14T19:58:12Z\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.taxwire.com/customers")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"source_id\": \"CUS-1042\",\n  \"source\": \"taxwire\",\n  \"source_account_id\": \"__default__\",\n  \"name\": \"Acme Wholesale\",\n  \"email\": \"ap@acme.example\",\n  \"source_updated_at\": \"2026-09-14T19:58:12Z\"\n}"

response = http.request(request)
puts response.read_body

{
  "id": "cust_01J9Z8Q4E7K2M3N4P5R6S7T8U9",
  "source_id": "CUS-1042",
  "source": "taxwire",
  "source_account_id": "__default__",
  "created_at": "2026-09-14T20:00:00Z",
  "updated_at": "2026-09-14T20:00:00Z",
  "name": "Acme Wholesale",
  "email": "ap@acme.example",
  "merged_into_customer_id": null,
  "source_updated_at": "2026-09-14T19:58:12Z"
}

{
  "detail": [
    {
      "type": "string_type",
      "loc": [
        "body",
        "line_items",
        0,
        "quantity"
      ],
      "msg": "Input should be a valid string",
      "input": 1
    }
  ]
}

{
  "detail": "Rate limit exceeded"
}

"Internal Server Error"

Authorizations

X-API-Key

string

header

required

Body

application/json

The fields to create a customer with.

source_id

string

required

Your identifier for the customer in the system it comes from. Non-blank. Calculations name the customer with it as customer.preset.id.

Maximum string length: 255

Example:

"CUS-1042"

source

enum<string>

default:taxwire

The system the customer comes from. Defaults to taxwire.

Available options:

business_central,

campfire,

maxio,

monetizenow,

netsuite,

quickbooks,

rillet,

salesbricks,

shopify,

stripe,

taxwire,

xero

Example:

"taxwire"

source_account_id

string

default:__default__

The account the customer belongs to within source. It must match how Taxwire's customer sync stores this source's customers today, or the push creates a second copy of each one: the realm id for quickbooks, the tenant id for xero (which also prefixes source_id). Every other source's customers are stored without an account, so leave it __default__; netsuite keeps its account inside source_id instead, lowercased: td3106586:1042.

Maximum string length: 255

Example:

"__default__"

name

string | null

The customer's display name.

Maximum string length: 500

Example:

"Acme Wholesale"

string | null

The customer's email. Need not be unique.

Maximum string length: 320

Example:

"ap@acme.example"

source_updated_at

string<date-time> | null

When the customer last changed in the source system. Recommended for every source except taxwire: a later write older than this is ignored.

Example:

"2026-09-14T19:58:12Z"

Response

Successful Response

A customer: who is buying. Exemptions set in the app hang off it.

string

required

Taxwire's stable identifier for the customer.

Example:

"cust_01J9Z8Q4E7K2M3N4P5R6S7T8U9"

source_id

string

required

Your identifier for the customer in the system it came from. Pass it as customer.preset.id on a calculation to name this customer.

Examples:

"CUS-1042"

"td3106586:1042"

source

enum<string>

required

The system the customer came from. taxwire for customers you send directly to this API.

Available options:

business_central,

campfire,

maxio,

monetizenow,

netsuite,

quickbooks,

rillet,

salesbricks,

shopify,

stripe,

taxwire,

xero

Examples:

"taxwire"

"netsuite"

source_account_id

string

required

The account the customer belongs to within source, as Taxwire's customer sync stores it. __default__ when the customer is stored without one: today that's every source except quickbooks and xero.

Examples:

"__default__"

"9130349283746"

created_at

string<date-time>

required

When Taxwire first stored the customer.

Example:

"2026-09-14T20:00:00Z"

updated_at

string<date-time>

required

When the customer was last changed in Taxwire. Equals created_at until the first change.

Example:

"2026-09-14T20:00:00Z"

name

string | null

The customer's display name.

Example:

"Acme Wholesale"

string | null

The customer's email. Not unique: several customers can share one inbox.

Example:

"ap@acme.example"

merged_into_customer_id

string | null

Set when the source system merged this customer into another; the id of the surviving customer. Null otherwise.

Example:

null

source_updated_at

string<date-time> | null

When the customer last changed in the source system, as reported by the sender. Null when unknown.

Example:

"2026-09-14T19:58:12Z"

Create a Customer

curl --request POST \
  --url https://api.taxwire.com/customers \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "source_id": "CUS-1042",
  "source": "taxwire",
  "source_account_id": "__default__",
  "name": "Acme Wholesale",
  "email": "ap@acme.example",
  "source_updated_at": "2026-09-14T19:58:12Z"
}
'

import requests

url = "https://api.taxwire.com/customers"

payload = {
    "source_id": "CUS-1042",
    "source": "taxwire",
    "source_account_id": "__default__",
    "name": "Acme Wholesale",
    "email": "ap@acme.example",
    "source_updated_at": "2026-09-14T19:58:12Z"
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    source_id: 'CUS-1042',
    source: 'taxwire',
    source_account_id: '__default__',
    name: 'Acme Wholesale',
    email: 'ap@acme.example',
    source_updated_at: '2026-09-14T19:58:12Z'
  })
};

fetch('https://api.taxwire.com/customers', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.taxwire.com/customers",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'source_id' => 'CUS-1042',
    'source' => 'taxwire',
    'source_account_id' => '__default__',
    'name' => 'Acme Wholesale',
    'email' => 'ap@acme.example',
    'source_updated_at' => '2026-09-14T19:58:12Z'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

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

func main() {

	url := "https://api.taxwire.com/customers"

	payload := strings.NewReader("{\n  \"source_id\": \"CUS-1042\",\n  \"source\": \"taxwire\",\n  \"source_account_id\": \"__default__\",\n  \"name\": \"Acme Wholesale\",\n  \"email\": \"ap@acme.example\",\n  \"source_updated_at\": \"2026-09-14T19:58:12Z\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-API-Key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.taxwire.com/customers")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"source_id\": \"CUS-1042\",\n  \"source\": \"taxwire\",\n  \"source_account_id\": \"__default__\",\n  \"name\": \"Acme Wholesale\",\n  \"email\": \"ap@acme.example\",\n  \"source_updated_at\": \"2026-09-14T19:58:12Z\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.taxwire.com/customers")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"source_id\": \"CUS-1042\",\n  \"source\": \"taxwire\",\n  \"source_account_id\": \"__default__\",\n  \"name\": \"Acme Wholesale\",\n  \"email\": \"ap@acme.example\",\n  \"source_updated_at\": \"2026-09-14T19:58:12Z\"\n}"

response = http.request(request)
puts response.read_body

{
  "id": "cust_01J9Z8Q4E7K2M3N4P5R6S7T8U9",
  "source_id": "CUS-1042",
  "source": "taxwire",
  "source_account_id": "__default__",
  "created_at": "2026-09-14T20:00:00Z",
  "updated_at": "2026-09-14T20:00:00Z",
  "name": "Acme Wholesale",
  "email": "ap@acme.example",
  "merged_into_customer_id": null,
  "source_updated_at": "2026-09-14T19:58:12Z"
}

{
  "detail": [
    {
      "type": "string_type",
      "loc": [
        "body",
        "line_items",
        0,
        "quantity"
      ],
      "msg": "Input should be a valid string",
      "input": 1
    }
  ]
}

{
  "detail": "Rate limit exceeded"
}

"Internal Server Error"

Getting Started

Guides

API details

Calculations

Transactions

Customers

Product Tax Codes (PTC)

Resources

Authorizations

Body

Response