Subscriptions API quickstart

This page is the end-to-end integration path for subscriptions: create a checkout for a subscription offer, list your subscribers, gate access on a subscriber’s live status, cancel/pause/resume from your backend, and react to subscription webhooks. You can create offers through the REST API or in the dashboard — see the subscriptions guide. For the full endpoint catalog, see the API reference.

Sell

POST /checkout/sessions with your subscription offer’s id, redirect the buyer to the returned url.

Gate

Check GET /subscriptions/subscribers/{id} (optionally ?live=true) before serving paid content.

React

Verify and handle customer.subscription.* / invoice.* webhooks to keep your records in sync.

1. Authentication and base URL

Every request goes to https://api.pocketsflow.com with your API key in the Authorization header — pk_live_… for live mode, pk_test_… for sandbox data. Create keys in the dashboard under Developers → API keys, and keep them server-side only. Details: Authentication & security.

curl https://api.pocketsflow.com/users/me \
  -H "Authorization: Bearer pk_live_xxxxxxxxxxxxxxxxxxxxxxxx"

const res = await fetch("https://api.pocketsflow.com/users/me", {
  headers: { Authorization: `Bearer ${process.env.POCKETSFLOW_API_KEY}` },
});
const me = await res.json();

import os
import requests

res = requests.get(
    "https://api.pocketsflow.com/users/me",
    headers={"Authorization": f"Bearer {os.environ['POCKETSFLOW_API_KEY']}"},
)
me = res.json()

$ch = curl_init('https://api.pocketsflow.com/users/me');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER     => [
        'Authorization: Bearer ' . getenv('POCKETSFLOW_API_KEY'),
    ],
]);
$me = json_decode(curl_exec($ch), true);
curl_close($ch);

Create a subscription offer

Use POST /subscriptions to create the recurring product before creating a checkout session. The endpoint accepts JSON for API clients and multipart/form-data when you also need to upload offer assets.

cURL

curl -X POST https://api.pocketsflow.com/subscriptions \
  -H "Authorization: Bearer pk_live_xxx" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "Pro Membership",
    "price": 29,
    "frequency": "monthly",
    "trialPeriod": 0,
    "redirectBackUrl": "https://yourapp.com/billing"
  }'

price is in USD. frequency must be weekly, monthly, or yearly; trialPeriod is the number of trial days. The endpoint returns the created offer with 201 Created. The same operation is available through the official Node.js/TypeScript SDK:

import { Pocketsflow } from "pocketsflow";

const pocketsflow = new Pocketsflow({
  apiKey: process.env.POCKETSFLOW_API_KEY!,
});

const offer = await pocketsflow.subscriptionOffers.create({
  name: "Pro Membership",
  price: 29,
  frequency: "monthly",
  trialPeriod: 0,
  redirectBackUrl: "https://yourapp.com/billing",
});

Install the SDK with npm install pocketsflow. See the SDK guide for configuration, resource methods, and error handling. The SDK source’s current v1.2.0 release includes subscriptionOffers.create; if your installed npm version predates that release, use the REST request above until you upgrade.

2. Create a checkout session for a subscription offer

POST /checkout/sessions accepts a subscription offer id in productId (the same field used for one-time products — pass either kind of id). Redirect the buyer to the url in the response; Pocketsflow hosts the checkout and the recurring billing.

curl -X POST https://api.pocketsflow.com/checkout/sessions \
  -H "Authorization: Bearer pk_live_xxx" \
  -H "Content-Type: application/json" \
  -d '{
    "productId": "665f1c2a9b3e4a0012ab7788",
    "successUrl": "https://yourapp.com/welcome",
    "cancelUrl": "https://yourapp.com/pricing",
    "customerEmail": "ada@example.com",
    "clientReferenceId": "user_8271",
    "metadata": { "plan": "pro" }
  }'

const res = await fetch("https://api.pocketsflow.com/checkout/sessions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.POCKETSFLOW_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    productId: "665f1c2a9b3e4a0012ab7788", // subscription offer _id
    successUrl: "https://yourapp.com/welcome",
    cancelUrl: "https://yourapp.com/pricing",
    customerEmail: user.email,
    clientReferenceId: user.id, // echoed back on every subscription webhook
    metadata: { plan: "pro" },
  }),
});

const { url } = await res.json();
// Redirect the buyer to `url`.

import os
import requests

res = requests.post(
    "https://api.pocketsflow.com/checkout/sessions",
    headers={"Authorization": f"Bearer {os.environ['POCKETSFLOW_API_KEY']}"},
    json={
        "productId": "665f1c2a9b3e4a0012ab7788",  # subscription offer _id
        "successUrl": "https://yourapp.com/welcome",
        "cancelUrl": "https://yourapp.com/pricing",
        "customerEmail": user.email,
        "clientReferenceId": user.id,  # echoed back on every subscription webhook
        "metadata": {"plan": "pro"},
    },
)
session = res.json()
# Redirect the buyer to session["url"].

$ch = curl_init('https://api.pocketsflow.com/checkout/sessions');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POST           => true,
    CURLOPT_HTTPHEADER     => [
        'Authorization: Bearer ' . getenv('POCKETSFLOW_API_KEY'),
        'Content-Type: application/json',
    ],
    CURLOPT_POSTFIELDS => json_encode([
        'productId'         => '665f1c2a9b3e4a0012ab7788', // subscription offer _id
        'successUrl'        => 'https://yourapp.com/welcome',
        'cancelUrl'         => 'https://yourapp.com/pricing',
        'customerEmail'     => $user_email,
        'clientReferenceId' => $user_id, // echoed back on every subscription webhook
        'metadata'          => ['plan' => 'pro'],
    ]),
]);
$session = json_decode(curl_exec($ch), true);
curl_close($ch);
// header('Location: ' . $session['url']);

The response is 201 with:

{
  "id": "cs_3f2a9d0e1b2c4a5d6e7f8091a2b3c4d5e6f70819",
  "url": "https://yourstore.pocketsflow.com/checkout?…"
}

successUrl/cancelUrl must be absolute http(s) URLs; clientReferenceId (max 256 chars) and metadata are captured at activation and replayed on every customer.subscription.* / invoice.* webhook, so you can bind events back to your own user records. The full field table is in the custom platforms guide.

3. List your subscription offers

GET /subscriptions returns your offers (the recurring products), newest first, scoped to your account and the key’s test/live mode. Use it to find the _id to sell in step 2.

curl https://api.pocketsflow.com/subscriptions \
  -H "Authorization: Bearer pk_live_xxx"

const res = await fetch("https://api.pocketsflow.com/subscriptions", {
  headers: { Authorization: `Bearer ${process.env.POCKETSFLOW_API_KEY}` },
});
const offers = await res.json();

import os
import requests

offers = requests.get(
    "https://api.pocketsflow.com/subscriptions",
    headers={"Authorization": f"Bearer {os.environ['POCKETSFLOW_API_KEY']}"},
).json()

$ch = curl_init('https://api.pocketsflow.com/subscriptions');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER     => [
        'Authorization: Bearer ' . getenv('POCKETSFLOW_API_KEY'),
    ],
]);
$offers = json_decode(curl_exec($ch), true);
curl_close($ch);

[
  {
    "_id": "665f1c2a9b3e4a0012ab7788",
    "name": "Pro Membership",
    "subtitle": "Everything in Starter, plus…",
    "price": 29,
    "currency": "usd",
    "frequency": "monthly",
    "trialPeriod": 0,
    "published": true,
    "testMode": false,
    "createdAt": "2026-05-01T09:12:44.103Z",
    "…": "…"
  }
]

frequency is weekly, monthly, or yearly. A single offer is available at GET /subscriptions/{id} (404 if it doesn’t exist or isn’t yours).

4. List subscribers (filter by status)

GET /subscriptions/subscribers is the paginated roster of buyers across your offers. Filters: status, buyerEmail (alias email), subscriptionId, page (default 1), pageSize (default 20).

curl "https://api.pocketsflow.com/subscriptions/subscribers?status=active&page=1&pageSize=20" \
  -H "Authorization: Bearer pk_live_xxx"

const params = new URLSearchParams({ status: "active", page: "1", pageSize: "20" });
const res = await fetch(
  `https://api.pocketsflow.com/subscriptions/subscribers?${params}`,
  { headers: { Authorization: `Bearer ${process.env.POCKETSFLOW_API_KEY}` } },
);
const { subscribers, pagination } = await res.json();

import os
import requests

data = requests.get(
    "https://api.pocketsflow.com/subscriptions/subscribers",
    headers={"Authorization": f"Bearer {os.environ['POCKETSFLOW_API_KEY']}"},
    params={"status": "active", "page": 1, "pageSize": 20},
).json()
subscribers, pagination = data["subscribers"], data["pagination"]

$query = http_build_query(['status' => 'active', 'page' => 1, 'pageSize' => 20]);
$ch = curl_init('https://api.pocketsflow.com/subscriptions/subscribers?' . $query);
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER     => [
        'Authorization: Bearer ' . getenv('POCKETSFLOW_API_KEY'),
    ],
]);
$data = json_decode(curl_exec($ch), true);
curl_close($ch);
$subscribers = $data['subscribers'];

{
  "subscribers": [
    {
      "_id": "665f1c2a9b3e4a0012abccdd",
      "buyerEmail": "ada@example.com",
      "status": "active",
      "active": true,
      "whopSubscriptionId": "plan_vlD50mPbsqJLp",
      "subscriptionId": "665f1c2a9b3e4a0012ab7788",
      "firstName": "Ada",
      "lastName": "Lovelace",
      "country": "NL",
      "portalUrl": "https://app.pocketsflow.com/portal/665f1c2a9b3e4a0012ab7788/665f1c2a9b3e4a0012abccdd",
      "createdAt": "2026-06-24T10:00:00.000Z",
      "subscription": {
        "_id": "665f1c2a9b3e4a0012ab7788",
        "name": "Pro Membership",
        "price": 29,
        "frequency": "monthly"
      }
    }
  ],
  "pagination": {
    "totalCount": 137,
    "totalPages": 7,
    "currentPage": 1,
    "pageSize": 20,
    "hasMore": true
  }
}

status values include active, trialing, past_due, paused, and canceled (full list in the API reference). portalUrl is the subscriber’s self-service portal — share it so buyers can manage their own membership.

5. Verify one subscriber’s live status (the access gate)

Before serving paid content, look the subscriber up by their _id (the 24-hex Mongo id from step 4 or from webhooks — not a mem_… id here). Add ?live=true to also fetch the authoritative membership from the payment processor as whopMembership; if that live lookup fails, whopMembership is null and the stored status still applies, so the request never fails.

curl "https://api.pocketsflow.com/subscriptions/subscribers/665f1c2a9b3e4a0012abccdd?live=true" \
  -H "Authorization: Bearer pk_live_xxx"

const res = await fetch(
  `https://api.pocketsflow.com/subscriptions/subscribers/${subscriberId}?live=true`,
  { headers: { Authorization: `Bearer ${process.env.POCKETSFLOW_API_KEY}` } },
);
const { status, whopMembership } = await res.json();

// Gate: prefer the live membership when available, fall back to stored status.
const isPaying = whopMembership
  ? whopMembership.valid === true
  : ["active", "trialing"].includes(status);

import os
import requests

data = requests.get(
    f"https://api.pocketsflow.com/subscriptions/subscribers/{subscriber_id}",
    headers={"Authorization": f"Bearer {os.environ['POCKETSFLOW_API_KEY']}"},
    params={"live": "true"},
).json()

# Gate: prefer the live membership when available, fall back to stored status.
membership = data.get("whopMembership")
is_paying = (
    membership["valid"] is True
    if membership
    else data["status"] in ("active", "trialing")
)

$ch = curl_init(
    'https://api.pocketsflow.com/subscriptions/subscribers/' . $subscriber_id . '?live=true'
);
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER     => [
        'Authorization: Bearer ' . getenv('POCKETSFLOW_API_KEY'),
    ],
]);
$data = json_decode(curl_exec($ch), true);
curl_close($ch);

// Gate: prefer the live membership when available, fall back to stored status.
$is_paying = isset($data['whopMembership'])
    ? ($data['whopMembership']['valid'] ?? false) === true
    : in_array($data['status'], ['active', 'trialing'], true);

{
  "subscriber": {
    "_id": "665f1c2a9b3e4a0012abccdd",
    "buyerEmail": "ada@example.com",
    "status": "active",
    "active": true,
    "portalUrl": "https://app.pocketsflow.com/portal/665f1c2a9b3e4a0012ab7788/665f1c2a9b3e4a0012abccdd",
    "…": "…"
  },
  "subscription": {
    "_id": "665f1c2a9b3e4a0012ab7788",
    "name": "Pro Membership",
    "price": 29,
    "frequency": "monthly",
    "…": "…"
  },
  "customer": { "_id": "665f1c2a9b3e4a0012abaa11", "buyerEmail": "ada@example.com", "…": "…" },
  "status": "active",
  "payments": [
    { "_id": "665f1c2a9b3e4a0012ab0002", "billingReason": "renewal", "amount": 29, "createdAt": "2026-06-24T10:00:00.000Z" },
    { "_id": "665f1c2a9b3e4a0012ab0001", "billingReason": "initial", "amount": 29, "createdAt": "2026-05-24T10:00:00.000Z" }
  ],
  "whopMembership": { "id": "mem_UCTD32gDLGTgb", "status": "active", "valid": true }
}

payments is the full history for this membership — the initial charge plus every renewal. For hot paths, gate on the stored status (kept fresh by webhooks) and reserve ?live=true for the moments that matter, like restoring account access after a failed payment.

6. Cancel, pause, or resume a subscriber

Three lifecycle actions, all POST with an empty body. {id} is the subscriber’s _id or their processor membership id (mem_…).

Action	Path	Effect
Cancel	`POST /subscriptions/{id}/cancel`	Cancels at period end — the buyer keeps access until the paid period runs out.
Pause	`POST /subscriptions/{id}/pause`	Stops payment collection; the buyer keeps access until resumed.
Resume	`POST /subscriptions/{id}/resume`	Reverses a scheduled cancel / restarts collection.

curl -X POST https://api.pocketsflow.com/subscriptions/665f1c2a9b3e4a0012abccdd/cancel \
  -H "Authorization: Bearer pk_live_xxx"

const res = await fetch(
  `https://api.pocketsflow.com/subscriptions/${subscriberId}/cancel`,
  {
    method: "POST",
    headers: { Authorization: `Bearer ${process.env.POCKETSFLOW_API_KEY}` },
  },
);
const { success, status, cancelAtPeriodEnd } = await res.json();
// Same call shape for `/pause` and `/resume`.

import os
import requests

result = requests.post(
    f"https://api.pocketsflow.com/subscriptions/{subscriber_id}/cancel",
    headers={"Authorization": f"Bearer {os.environ['POCKETSFLOW_API_KEY']}"},
).json()
# Same call shape for `/pause` and `/resume`.

$ch = curl_init(
    'https://api.pocketsflow.com/subscriptions/' . $subscriber_id . '/cancel'
);
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POST           => true,
    CURLOPT_HTTPHEADER     => [
        'Authorization: Bearer ' . getenv('POCKETSFLOW_API_KEY'),
    ],
]);
$result = json_decode(curl_exec($ch), true);
curl_close($ch);
// Same call shape for `/pause` and `/resume`.

cancel and resume respond with:

{
  "success": true,
  "status": "active",
  "cancelAtPeriodEnd": true,
  "manageUrl": "https://whop.com/…"
}

pause adds a paused boolean to the same shape. Pause is provider-first: if the processor refuses, you get a 502 and no local state changes — and a subscriber with no membership on record returns 400. Cancelling also fires the customer.subscription.updated webhook (and customer.subscription.deleted when the membership actually ends); pausing/resuming fire customer.subscription.pause / customer.subscription.resumed.

7. Receive and verify subscription webhooks

Register an endpoint (dashboard, or POST /webhooks) and subscribe to the subscription events. Every delivery is a POST with these headers:

Header	Description
`X-Pocketsflow-Event`	The event name — route on this.
`X-Pocketsflow-Signature`	Hex HMAC-SHA256 of the raw request body, keyed with your endpoint’s signing secret.
`X-Pocketsflow-Timestamp`	Unix epoch milliseconds when the event was sent (informational — not part of the signature).

Subscription-related events: customer.subscription.created, customer.subscription.updated, customer.subscription.deleted, customer.subscription.pause, customer.subscription.resumed, customer.subscription.trial_will_end, invoice.created, invoice.upcoming, invoice.payment_succeeded, invoice.payment_failed, payment_intent.succeeded, and payment_intent.payment_failed. Every payload carries a top-level subscriptionCustomerId (the subscriber _id from steps 4–6) and your clientReferenceId/metadata from checkout. Payload shapes: Webhook events. Always verify the signature over the raw body (never re-serialize the parsed JSON) with a constant-time comparison:

import express from "express";
import crypto from "crypto";

const app = express();

app.post(
  "/webhooks/pocketsflow",
  express.raw({ type: "application/json" }),
  (req, res) => {
    const signature = req.header("X-Pocketsflow-Signature") || "";
    const expected = crypto
      .createHmac("sha256", process.env.POCKETSFLOW_WEBHOOK_SECRET)
      .update(req.body) // raw Buffer
      .digest("hex");

    const a = Buffer.from(signature);
    const b = Buffer.from(expected);
    if (a.length !== b.length || !crypto.timingSafeEqual(a, b)) {
      return res.status(400).send("Invalid signature");
    }

    const event = req.header("X-Pocketsflow-Event");
    const payload = JSON.parse(req.body.toString("utf8"));

    switch (event) {
      case "customer.subscription.created":
        grantAccess(payload.subscriptionCustomerId, payload.clientReferenceId);
        break;
      case "customer.subscription.deleted":
        revokeAccess(payload.subscriptionCustomerId);
        break;
      case "invoice.payment_failed":
        flagPastDue(payload.subscriptionCustomerId);
        break;
    }
    // Handlers must be idempotent.

    res.status(200).send("OK");
  }
);

import hashlib
import hmac
import os

from flask import Flask, abort, request

app = Flask(__name__)

@app.post("/webhooks/pocketsflow")
def pocketsflow_webhook():
    raw = request.get_data()  # raw bytes — never re-serialize
    signature = request.headers.get("X-Pocketsflow-Signature", "")
    expected = hmac.new(
        os.environ["POCKETSFLOW_WEBHOOK_SECRET"].encode(), raw, hashlib.sha256
    ).hexdigest()

    if not hmac.compare_digest(signature, expected):
        abort(400)

    event = request.headers.get("X-Pocketsflow-Event")
    payload = request.get_json()

    if event == "customer.subscription.created":
        grant_access(payload["subscriptionCustomerId"], payload.get("clientReferenceId"))
    elif event == "customer.subscription.deleted":
        revoke_access(payload["subscriptionCustomerId"])
    elif event == "invoice.payment_failed":
        flag_past_due(payload["subscriptionCustomerId"])
    # Handlers must be idempotent.

    return "OK", 200

$raw       = file_get_contents( 'php://input' );
$signature = $_SERVER['HTTP_X_POCKETSFLOW_SIGNATURE'] ?? '';
$expected  = hash_hmac( 'sha256', $raw, getenv( 'POCKETSFLOW_WEBHOOK_SECRET' ) );

if ( ! hash_equals( $expected, $signature ) ) {
    http_response_code( 400 );
    exit( 'Invalid signature' );
}

$event   = $_SERVER['HTTP_X_POCKETSFLOW_EVENT'] ?? '';
$payload = json_decode( $raw, true );

switch ( $event ) {
    case 'customer.subscription.created':
        grant_access( $payload['subscriptionCustomerId'], $payload['clientReferenceId'] ?? null );
        break;
    case 'customer.subscription.deleted':
        revoke_access( $payload['subscriptionCustomerId'] );
        break;
    case 'invoice.payment_failed':
        flag_past_due( $payload['subscriptionCustomerId'] );
        break;
}
// Handlers must be idempotent.

http_response_code( 200 );
echo 'OK';

Each event is delivered with a single attempt and a 5-second timeout — acknowledge with a 2xx immediately and do the real work asynchronously. If a delivery is missed, reconcile via GET /subscriptions/subscribers (step 4).

Example repository

Prefer runnable code? The subscriptions example on GitHub has everything on this page as a clone-and-run project: a checkout embed (hosted link, popup, and inline) plus a Node/Express webhook receiver that verifies the signature and handles the full subscription lifecycle.

Subscriptions example repo — runnable embed + webhook code
Webhook events — every payload, field by field
Authentication & security
Consuming webhooks
API reference
Subscriptions guide — creating offers in the dashboard
Custom platforms — the generic checkout + webhook pattern

Overview

API reference

Webhooks

1. Authentication and base URL

Create a subscription offer

2. Create a checkout session for a subscription offer

3. List your subscription offers

4. List subscribers (filter by status)

5. Verify one subscriber’s live status (the access gate)

6. Cancel, pause, or resume a subscriber

7. Receive and verify subscription webhooks

Example repository

​1. Authentication and base URL

​Create a subscription offer

​2. Create a checkout session for a subscription offer

​3. List your subscription offers

​4. List subscribers (filter by status)

​5. Verify one subscriber’s live status (the access gate)

​6. Cancel, pause, or resume a subscriber

​7. Receive and verify subscription webhooks

​Example repository

​Related topics

1. Authentication and base URL

Create a subscription offer

2. Create a checkout session for a subscription offer

3. List your subscription offers

4. List subscribers (filter by status)

5. Verify one subscriber’s live status (the access gate)

6. Cancel, pause, or resume a subscriber

7. Receive and verify subscription webhooks

Example repository

Related topics