curl --request POST 'https://api.integrateledger.com/v1/billing/attach' \
  -H "Authorization: Bearer $LEDGER_API_KEY" \
  -H 'Content-Type: application/json' \
  --data '{"customerId":"user_123","planId":"starter"}'

import os
from ledger_sdk import Ledger

ledger = Ledger(api_key=os.environ["LEDGER_API_KEY"])
ledger.attach(customer_id="user_123", plan_id="starter")

import { Ledger } from "@ledger/sdk";

const ledger = new Ledger({ apiKey: process.env.LEDGER_API_KEY ?? "" });
await ledger.attach({ customerId: "user_123", planId: "starter" });

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({customerId: '<string>', planId: '<string>'})
};

fetch('https://api.integrateledger.com/v1/billing/attach', 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.integrateledger.com/v1/billing/attach",
  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([
    'customerId' => '<string>',
    'planId' => '<string>'
  ]),
  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://api.integrateledger.com/v1/billing/attach"

	payload := strings.NewReader("{\n  \"customerId\": \"<string>\",\n  \"planId\": \"<string>\"\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://api.integrateledger.com/v1/billing/attach")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"customerId\": \"<string>\",\n  \"planId\": \"<string>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.integrateledger.com/v1/billing/attach")

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  \"customerId\": \"<string>\",\n  \"planId\": \"<string>\"\n}"

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

{
  "checkoutUrl": "<string>",
  "subscriptionId": 123
}

{
  "error": "<string>"
}

{
  "error": "<string>"
}

{
  "error": "<string>"
}

{
  "error": "<string>"
}

{
  "error": "<string>"
}

{
  "error": "<string>"
}