curl --request POST \
  --url https://app.saasybill.com/api/v1/customers \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "code": "ACME-001",
  "name": "Acme Pty Ltd",
  "email": "accounts@acme.example"
}
'

import requests

url = "https://app.saasybill.com/api/v1/customers"

payload = {
    "code": "ACME-001",
    "name": "Acme Pty Ltd",
    "email": "accounts@acme.example"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({code: 'ACME-001', name: 'Acme Pty Ltd', email: 'accounts@acme.example'})
};

fetch('https://app.saasybill.com/api/v1/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://app.saasybill.com/api/v1/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([
    'code' => 'ACME-001',
    'name' => 'Acme Pty Ltd',
    'email' => 'accounts@acme.example'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($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://app.saasybill.com/api/v1/customers"

	payload := strings.NewReader("{\n  \"code\": \"ACME-001\",\n  \"name\": \"Acme Pty Ltd\",\n  \"email\": \"accounts@acme.example\"\n}")

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

	req.Header.Add("Authorization", "Bearer <token>")
	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://app.saasybill.com/api/v1/customers")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"code\": \"ACME-001\",\n  \"name\": \"Acme Pty Ltd\",\n  \"email\": \"accounts@acme.example\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://app.saasybill.com/api/v1/customers")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"code\": \"ACME-001\",\n  \"name\": \"Acme Pty Ltd\",\n  \"email\": \"accounts@acme.example\"\n}"

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

{
  "id": "3b9f1c1e-6a52-4c0e-9d7e-1f6f2f0b7a11",
  "object": "customer",
  "code": "ACME-001",
  "name": "Acme Pty Ltd",
  "company_name": "Acme Pty Ltd",
  "first_name": null,
  "last_name": null,
  "email": "accounts@acme.example",
  "status": "active",
  "xero_contact_id": "d5f2a8c1-6b73-4e09-8a1d-4c7e9b3f0a12",
  "created": "2026-08-14T02:31:08.000Z"
}

{
  "id": "3b9f1c1e-6a52-4c0e-9d7e-1f6f2f0b7a11",
  "object": "customer",
  "code": "ACME-001",
  "name": "Acme Pty Ltd",
  "company_name": "Acme Pty Ltd",
  "first_name": null,
  "last_name": null,
  "email": "accounts@acme.example",
  "status": "active",
  "xero_contact_id": "d5f2a8c1-6b73-4e09-8a1d-4c7e9b3f0a12",
  "created": "2026-08-14T02:31:08.000Z"
}

{
  "error": {
    "type": "authentication_error",
    "code": "invalid_api_key",
    "message": "Provide a valid API key as `Authorization: Bearer <key>`.",
    "request_id": "req_4f1a9c2e7b8d3a605e1c9f02"
  }
}

{
  "error": {
    "type": "permission_error",
    "code": "xero_contact_creation_disabled",
    "message": "This organisation has not allowed the API to create Xero contacts. An owner or admin can turn it on under Developer Settings.",
    "request_id": "req_4f1a9c2e7b8d3a605e1c9f02"
  }
}

{
  "error": {
    "type": "not_found",
    "code": "customer_not_found",
    "message": "There is no customer with that id.",
    "request_id": "req_4f1a9c2e7b8d3a605e1c9f02"
  }
}

{
  "error": {
    "type": "conflict",
    "code": "idempotency_conflict",
    "message": "This `Idempotency-Key` was used with a different request. Use a new key for a different request.",
    "request_id": "req_4f1a9c2e7b8d3a605e1c9f02"
  }
}

{
  "error": {
    "type": "invalid_request_error",
    "code": "invalid_parameter",
    "message": "`units`: Invalid input: expected number, received string",
    "param": "units",
    "request_id": "req_4f1a9c2e7b8d3a605e1c9f02"
  }
}

{
  "error": {
    "type": "rate_limit_error",
    "code": "rate_limited",
    "message": "Too many requests. Try again in 12 seconds.",
    "request_id": "req_4f1a9c2e7b8d3a605e1c9f02"
  }
}

{
  "error": {
    "type": "api_error",
    "code": "internal_error",
    "message": "Something went wrong on our side. Retry the request; if it keeps failing, quote the request id.",
    "request_id": "req_4f1a9c2e7b8d3a605e1c9f02"
  }
}