curl --request POST \
  --url https://api.withflex.com/v1/subscriptions/{id}/resume \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "billing_cycle_anchor": "unchanged",
  "proration_behavior": "always_invoice"
}
'

import requests

url = "https://api.withflex.com/v1/subscriptions/{id}/resume"

payload = {
    "billing_cycle_anchor": "unchanged",
    "proration_behavior": "always_invoice"
}
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({billing_cycle_anchor: 'unchanged', proration_behavior: 'always_invoice'})
};

fetch('https://api.withflex.com/v1/subscriptions/{id}/resume', 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.withflex.com/v1/subscriptions/{id}/resume",
  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([
    'billing_cycle_anchor' => 'unchanged',
    'proration_behavior' => 'always_invoice'
  ]),
  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.withflex.com/v1/subscriptions/{id}/resume"

	payload := strings.NewReader("{\n  \"billing_cycle_anchor\": \"unchanged\",\n  \"proration_behavior\": \"always_invoice\"\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.withflex.com/v1/subscriptions/{id}/resume")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"billing_cycle_anchor\": \"unchanged\",\n  \"proration_behavior\": \"always_invoice\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.withflex.com/v1/subscriptions/{id}/resume")

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  \"billing_cycle_anchor\": \"unchanged\",\n  \"proration_behavior\": \"always_invoice\"\n}"

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

{
  "subscription": {
    "subscription_id": "fsub_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
    "created_at": "2026-06-15T14:30:00Z",
    "items": [
      {
        "subscription_item_id": "fsubi_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
        "price": "fprice_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
        "quantity": 2500,
        "created_at": "2026-06-15T14:30:00Z",
        "updated_at": "2026-06-15T14:30:00Z",
        "test_mode": false
      }
    ],
    "latest_invoice": "fin_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
    "customer": "fcus_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
    "status": "incomplete",
    "cancel_at_period_end": false,
    "current_period_end": "string",
    "current_period_start": "string",
    "metadata": {
      "order_id": "8842",
      "channel": "shopify"
    },
    "test_mode": false,
    "client_secret": {
      "setup_secret": "string",
      "payment_secret": "string"
    },
    "proration_behavior": "always_invoice",
    "trial_start": "string",
    "trial_end": "string",
    "cancel_at": "2026-06-15T14:30:00Z",
    "canceled_at": "2026-06-15T14:30:00Z",
    "default_payment_method": "fpm_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
    "backup_payment_method": "fpm_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
    "discounts": [
      {
        "discount_id": "fdi_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
        "checkout_session": "fcs_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
        "customer": "fcus_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
        "subscription": "fsub_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
        "invoice": "fin_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
        "source": {
          "coupon": "fcoup_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
          "type": "coupon"
        },
        "promo_code": "fpromo_01J9XR8M3K7VZ8N2YB4WJ6T0RA",
        "test_mode": false,
        "end": "string",
        "start": "string"
      }
    ],
    "pause": {
      "paused_at": "2026-06-15T14:30:00Z",
      "resume_at": "2026-06-15T14:30:00Z"
    }
  }
}

{
  "code": "string",
  "detail": "string"
}

{
  "code": "string",
  "detail": "string"
}

{
  "code": "string",
  "detail": "string"
}

{
  "code": "string",
  "detail": "string"
}

{
  "detail": [
    {
      "loc": [
        "string"
      ],
      "msg": "string",
      "type": "string"
    }
  ]
}

{
  "code": "string",
  "detail": "string"
}