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POST
/
api
/
v1
/
payments
/
stripe
/
checkout-session
Create Checkout Session
curl --request POST \
  --url https://api.devkit4ai.com/api/v1/payments/stripe/checkout-session \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "price_id": "<string>",
  "success_url": "<string>",
  "cancel_url": "<string>",
  "mode": "subscription",
  "quantity": 1,
  "metadata": {},
  "allow_existing_subscription": false
}
'
{
  "session_id": "<string>",
  "checkout_url": "<string>"
}

Documentation Index

Fetch the complete documentation index at: https://devkit4ai.com/docs/llms.txt

Use this file to discover all available pages before exploring further.

Create a Stripe Checkout session to redirect users to Stripe’s hosted checkout page. Supports both subscription and one-time payment modes.

​
Authentication

This endpoint requires end user authentication via HTTP Bearer Token with project scope.

​
Query Parameters

​
test_mode
boolean
default:"true"
Use test mode credentials. Set to false for production payments.

​
Request Body

​
price_id
string
required
Stripe Price ID for the product or subscription (e.g., price_1ABC...)
​
success_url
string
required
URL to redirect after successful payment. Include {CHECKOUT_SESSION_ID} placeholder.
​
cancel_url
string
required
URL to redirect if user cancels checkout
​
mode
string
default:"subscription"
Checkout mode: subscription or payment (one-time)
​
quantity
integer
default:"1"
Quantity of items (minimum: 1)
​
metadata
object
Additional metadata to attach to the checkout session
​
allow_existing_subscription
boolean
default:"false"
If true, allows checkout even if user already has an active subscription

​
Response

​
session_id
string
Stripe Checkout Session ID
​
checkout_url
string
URL to redirect user to Stripe Checkout

​
Example Request

curl -X POST "https://api.devkit4ai.com/api/v1/payments/stripe/checkout-session?test_mode=true" \
  -H "Authorization: Bearer {end_user_jwt}" \
  -H "Content-Type: application/json" \
  -d '{
    "price_id": "price_1ABC123def456",
    "success_url": "https://myapp.com/success?session_id={CHECKOUT_SESSION_ID}",
    "cancel_url": "https://myapp.com/pricing",
    "mode": "subscription"
  }'

​
Example Response

{
  "session_id": "cs_test_a1b2c3d4e5f6g7h8i9j0",
  "checkout_url": "https://checkout.stripe.com/c/pay/cs_test_a1b2c3d4e5f6g7h8i9j0"
}

​
Checkout Flow

​
Integration Example

​
Frontend (React)

// Pricing button component
const SubscribeButton = ({ priceId }: { priceId: string }) => {
  const handleSubscribe = async () => {
    const response = await fetch('/api/checkout', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        price_id: priceId,
        success_url: `${window.location.origin}/success?session_id={CHECKOUT_SESSION_ID}`,
        cancel_url: `${window.location.origin}/pricing`
      })
    });
    
    const { checkout_url } = await response.json();
    window.location.href = checkout_url;
  };

  return <button onClick={handleSubscribe}>Subscribe</button>;
};

​
Backend (Next.js API Route)

// app/api/checkout/route.ts
export async function POST(request: Request) {
  const body = await request.json();
  
  const response = await fetch(
    `${process.env.NEXT_PUBLIC_API_URL}/api/v1/payments/stripe/checkout-session?test_mode=${process.env.STRIPE_TEST_MODE}`,
    {
      method: 'POST',
      headers: {
        'Authorization': `Bearer ${getUserToken()}`,
        'Content-Type': 'application/json'
      },
      body: JSON.stringify(body)
    }
  );
  
  return Response.json(await response.json());
}

​
Existing Subscription Handling

By default, users with active subscriptions cannot start a new checkout:
Set allow_existing_subscription: true for upgrade/downgrade flows, or use the Update Subscription endpoint instead.

​
Price IDs

Get Price IDs from your Stripe Dashboard:
  1. Navigate to Products > Pricing
  2. Click on a price to view its ID
(((REPLACE_THIS_WITH_IMAGE: stripe-dashboard-price-id.png: Stripe Dashboard showing a product’s pricing section with Price ID visible)))

​
Error Responses

StatusDescription
400User already has active subscription (when allow_existing_subscription: false)
401Unauthorized - Invalid or missing authentication
404Project not found or Stripe not configured
422Validation error - Invalid price_id or URLs

Get My Subscription

Check user’s subscription status

Stripe Webhook

Handle checkout completion

Update Subscription

Change subscription plans

Authorizations

​
Authorization
string
header
required

The access token received from the authorization server in the OAuth 2.0 flow.

Query Parameters

​
test_mode
boolean
default:true

Use test mode credentials

Body

application/json

Request to create a Stripe checkout session.

​
price_id
string
required
Minimum string length: 1
​
success_url
string
required
Minimum string length: 1
​
cancel_url
string
required
Minimum string length: 1
​
mode
string
default:subscription
Pattern: ^(subscription|payment)$
​
quantity
integer
default:1
Required range: x >= 1
​
metadata
Metadata · object
​
allow_existing_subscription
boolean
default:false

If true, allows checkout even if user has active subscription

Response

Successful Response

Stripe checkout session response.

​
session_id
string
required
​
checkout_url
string
required