Create Subscription Checkout

curl -X POST https://api.llmgenerator.com/api/v1/subscriptions/checkout \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "planId": "professional",
    "successUrl": "https://yourapp.com/subscription/success",
    "cancelUrl": "https://yourapp.com/pricing"
  }'

const response = await fetch('https://api.llmgenerator.com/api/v1/subscriptions/checkout', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_ACCESS_TOKEN',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    planId: 'professional',
    successUrl: 'https://yourapp.com/subscription/success',
    cancelUrl: 'https://yourapp.com/pricing'
  })
});

const data = await response.json();
// Redirect user to Stripe checkout
window.location.href = data.url;

import requests

response = requests.post(
    'https://api.llmgenerator.com/api/v1/subscriptions/checkout',
    headers={
        'Authorization': 'Bearer YOUR_ACCESS_TOKEN',
        'Content-Type': 'application/json'
    },
    json={
        'planId': 'professional',
        'successUrl': 'https://yourapp.com/subscription/success',
        'cancelUrl': 'https://yourapp.com/pricing'
    }
)
data = response.json()
print(f"Redirect to: {data['url']}")

{
  "sessionId": "cs_test_a1b2c3d4e5f6g7h8i9j0",
  "url": "https://checkout.stripe.com/c/pay/cs_test_a1b2c3d4...",
  "plan": {
    "id": "professional",
    "name": "Professional",
    "monthlyCredits": 3000,
    "priceCents": 1299
  }
}

POST

subscriptions

checkout

curl -X POST https://api.llmgenerator.com/api/v1/subscriptions/checkout \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "planId": "professional",
    "successUrl": "https://yourapp.com/subscription/success",
    "cancelUrl": "https://yourapp.com/pricing"
  }'

const response = await fetch('https://api.llmgenerator.com/api/v1/subscriptions/checkout', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_ACCESS_TOKEN',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    planId: 'professional',
    successUrl: 'https://yourapp.com/subscription/success',
    cancelUrl: 'https://yourapp.com/pricing'
  })
});

const data = await response.json();
// Redirect user to Stripe checkout
window.location.href = data.url;

import requests

response = requests.post(
    'https://api.llmgenerator.com/api/v1/subscriptions/checkout',
    headers={
        'Authorization': 'Bearer YOUR_ACCESS_TOKEN',
        'Content-Type': 'application/json'
    },
    json={
        'planId': 'professional',
        'successUrl': 'https://yourapp.com/subscription/success',
        'cancelUrl': 'https://yourapp.com/pricing'
    }
)
data = response.json()
print(f"Redirect to: {data['url']}")

{
  "sessionId": "cs_test_a1b2c3d4e5f6g7h8i9j0",
  "url": "https://checkout.stripe.com/c/pay/cs_test_a1b2c3d4...",
  "plan": {
    "id": "professional",
    "name": "Professional",
    "monthlyCredits": 3000,
    "priceCents": 1299
  }
}

Overview

Creates a Stripe checkout session for subscribing to a plan. Returns a URL where you should redirect the user to complete the payment. Requires session-based authentication (JWT access token).

For third-party integrations: Use POST /subscriptions/checkout/api with API Key authentication instead.

Authentication

string

required

Your JWT access token. Format: Bearer YOUR_ACCESS_TOKEN

Request Body

string

required

The plan identifier to subscribe to. Must be one of: starter, professional, business, or agency.

string

default:"monthly"

Billing frequency. Options: monthly or yearly.

string

URL to redirect to after successful payment. Defaults to application dashboard.

string

URL to redirect to if user cancels payment. Defaults to pricing page.

curl -X POST https://api.llmgenerator.com/api/v1/subscriptions/checkout \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "planId": "professional",
    "successUrl": "https://yourapp.com/subscription/success",
    "cancelUrl": "https://yourapp.com/pricing"
  }'

const response = await fetch('https://api.llmgenerator.com/api/v1/subscriptions/checkout', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_ACCESS_TOKEN',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    planId: 'professional',
    successUrl: 'https://yourapp.com/subscription/success',
    cancelUrl: 'https://yourapp.com/pricing'
  })
});

const data = await response.json();
// Redirect user to Stripe checkout
window.location.href = data.url;

import requests

response = requests.post(
    'https://api.llmgenerator.com/api/v1/subscriptions/checkout',
    headers={
        'Authorization': 'Bearer YOUR_ACCESS_TOKEN',
        'Content-Type': 'application/json'
    },
    json={
        'planId': 'professional',
        'successUrl': 'https://yourapp.com/subscription/success',
        'cancelUrl': 'https://yourapp.com/pricing'
    }
)
data = response.json()
print(f"Redirect to: {data['url']}")

{
  "sessionId": "cs_test_a1b2c3d4e5f6g7h8i9j0",
  "url": "https://checkout.stripe.com/c/pay/cs_test_a1b2c3d4...",
  "plan": {
    "id": "professional",
    "name": "Professional",
    "monthlyCredits": 3000,
    "priceCents": 1299
  }
}

Response Fields

string

Stripe checkout session ID. Can be used to verify the session later.

string

URL to redirect the user to for payment. This is a Stripe-hosted checkout page.

object

Details of the selected plan.

Checkout Flow

Create session: Call this endpoint with the desired plan
Redirect user: Send user to the returned url
Payment processing: User completes payment on Stripe
Webhook: Stripe notifies your webhook endpoint
Success redirect: User is redirected to successUrl
Verify (optional): Check subscription status via /subscriptions/current

Error Responses

Bad Request - Invalid plan ID or user already has an active subscription.

Unauthorized - Invalid or missing token.

If the user already has an active subscription, they should use the billing portal (/subscriptions/portal) to change plans instead.

POST /subscriptions/checkout/api

Creates a Stripe checkout session using API Key authentication. Ideal for third-party integrations.

Authentication

Requires API Key authentication. Include your API key in the Authorization header:

Authorization: Bearer llmgen_your_api_key_here

Request Body

Same as /subscriptions/checkout above.

Response

Same as /subscriptions/checkout above.

curl -X POST https://api.llmgenerator.com/api/v1/subscriptions/checkout/api \
  -H "Authorization: Bearer llmgen_your_api_key_here" \
  -H "Content-Type: application/json" \
  -d '{
    "planId": "professional",
    "successUrl": "https://yourapp.com/subscription/success",
    "cancelUrl": "https://yourapp.com/pricing"
  }'

const response = await fetch('https://api.llmgenerator.com/api/v1/subscriptions/checkout/api', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer llmgen_your_api_key_here',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    planId: 'professional',
    successUrl: 'https://yourapp.com/subscription/success',
    cancelUrl: 'https://yourapp.com/pricing'
  })
});

const data = await response.json();
// Redirect user to Stripe checkout
window.location.href = data.url;

import requests

response = requests.post(
    'https://api.llmgenerator.com/api/v1/subscriptions/checkout/api',
    headers={
        'Authorization': 'Bearer llmgen_your_api_key_here',
        'Content-Type': 'application/json'
    },
    json={
        'planId': 'professional',
        'successUrl': 'https://yourapp.com/subscription/success',
        'cancelUrl': 'https://yourapp.com/pricing'
    }
)
data = response.json()
print(f"Redirect to: {data['url']}")

Get Started

Integrations

API Reference

Create Subscription Checkout

Overview

Authentication

Request Body

Response Fields

Checkout Flow

Error Responses

POST /subscriptions/checkout/api

Authentication

Request Body

Response

​Overview

​Authentication

​Request Body

​Response Fields

​Checkout Flow

​Error Responses

​POST /subscriptions/checkout/api

​Authentication

​Request Body

​Response

Overview

Authentication

Request Body

Response Fields

Checkout Flow

Error Responses

POST /subscriptions/checkout/api

Authentication

Request Body

Response