curl --request POST \
  --url https://api-sandbox.beinfi.com/billing/products/{productID}/subscriptions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "customerId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "productVersionId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "anchor": "2023-11-07T05:31:56Z",
  "items": [
    {}
  ]
}
'

import requests

url = "https://api-sandbox.beinfi.com/billing/products/{productID}/subscriptions"

payload = {
    "customerId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "productVersionId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "anchor": "2023-11-07T05:31:56Z",
    "items": [{}]
}
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({
    customerId: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    productVersionId: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    anchor: '2023-11-07T05:31:56Z',
    items: [{}]
  })
};

fetch('https://api-sandbox.beinfi.com/billing/products/{productID}/subscriptions', 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-sandbox.beinfi.com/billing/products/{productID}/subscriptions",
  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' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'productVersionId' => '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    'anchor' => '2023-11-07T05:31:56Z',
    'items' => [
        [
                
        ]
    ]
  ]),
  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-sandbox.beinfi.com/billing/products/{productID}/subscriptions"

	payload := strings.NewReader("{\n  \"customerId\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"productVersionId\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"anchor\": \"2023-11-07T05:31:56Z\",\n  \"items\": [\n    {}\n  ]\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-sandbox.beinfi.com/billing/products/{productID}/subscriptions")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"customerId\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"productVersionId\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"anchor\": \"2023-11-07T05:31:56Z\",\n  \"items\": [\n    {}\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api-sandbox.beinfi.com/billing/products/{productID}/subscriptions")

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\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"productVersionId\": \"3c90c3cc-0d44-4b50-8888-8dd25736052a\",\n  \"anchor\": \"2023-11-07T05:31:56Z\",\n  \"items\": [\n    {}\n  ]\n}"

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

{
  "subscription": {
    "id": "sub_2Kp7rWqT0aLm4XcVb8NzJe",
    "customerId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "productVersionId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "status": "trialing",
    "billingCycle": "weekly",
    "billingMode": "arrears",
    "anchor": "2023-11-07T05:31:56Z",
    "startedAt": "2023-11-07T05:31:56Z",
    "collectionMethod": "charge_automatically",
    "nextBillingDate": "2023-11-07T05:31:56Z",
    "canceledAt": "2023-11-07T05:31:56Z",
    "cancelReason": {
      "code": "<string>",
      "note": "<string>",
      "source": "buyer"
    },
    "items": [
      {
        "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "kind": "recurring_fee",
        "productVersionId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "createdAt": "2023-11-07T05:31:56Z",
        "timing": "advance",
        "canceledAt": "2023-11-07T05:31:56Z"
      }
    ]
  },
  "period": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "subscriptionId": "sub_2Kp7rWqT0aLm4XcVb8NzJe",
    "periodStart": "2023-11-07T05:31:56Z",
    "periodEnd": "2023-11-07T05:31:56Z",
    "status": "open",
    "invoiceId": "inv_6yi30EKotIwGHZdePSdsFc"
  }
}

{
  "message": "<string>",
  "error_code": "internal_error",
  "tracer_id": "<string>"
}

{
  "message": "<string>",
  "error_code": "internal_error",
  "tracer_id": "<string>"
}

{
  "message": "<string>",
  "error_code": "internal_error",
  "tracer_id": "<string>",
  "errors": [
    {
      "field": "<string>",
      "value": "<string>",
      "constraint": "<string>",
      "description": "<string>"
    }
  ]
}