Initialize checkout session

Initialize a checkout session and automatically redirect to the checkout URL. This endpoint works exactly like the current CMS checkout-init page - you can navigate to it with query parameters and it will automatically redirect the browser to the checkout page.

Perfect for direct links, email links, or anywhere you want automatic redirection.

This endpoint is completely public and requires no authentication.

Additional Query Parameters: Any extra query parameters you add will be automatically forwarded to the checkout URL. This is useful for tracking parameters (utm_source, utm_campaign, etc.) or custom parameters.

Customer Prefill: You can prefill customer information to streamline checkout:

• customerId: Link to existing customer account
• customerEmail: Prefill customer email
• customerFirstName: Prefill customer first name
• customerLastName: Prefill customer last name
• customerPhone: Prefill customer phone number
• customerTags: Apply tags to customer (comma-separated or JSON array: “segment:vip,source:facebook”)

Checkout Token Forwarding: Include the checkout token in the final checkout URL:

• includeCheckoutToken: Set to the desired query parameter name (default: “checkoutToken”)
• Example: includeCheckoutToken=checkoutToken will append ?checkoutToken=ch_abc123 to the checkout URL
• Example: includeCheckoutToken=token will append ?token=ch_abc123 to the checkout URL

Example usage:

GET /api/public/v1/checkout/init?storeId=store_123&items=[{"variantId":"var_123","quantity":1}]&currency=USD
→ Redirects to: https://checkout.example.com/checkout/ch_abc123/op?token=cms_token_xyz

GET /api/public/v1/checkout/init?storeId=store_123&items=[...]&currency=USD&utm_source=email&custom_param=value
→ Redirects to: https://checkout.example.com/checkout/ch_abc123/op?token=cms_token_xyz&utm_source=email&custom_param=value

GET /api/public/v1/checkout/init?storeId=store_123&items=[...]&currency=USD&customerEmail=john@example.com&customerFirstName=John&customerLastName=Doe
→ Redirects to checkout with customer information prefilled