> ## Documentation Index
> Fetch the complete documentation index at: https://docs.kyrenpay.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Checkout session creation fails

> Fix validation and configuration errors when creating checkout sessions.

## Symptom

Creating a Checkout Session returns an error or no hosted checkout URL is created.

## Likely causes

* The `product_id` does not exist or belongs to another merchant.
* The product is archived and can no longer be used for new sessions.
* The currency is not supported for the requested checkout.
* Amount or price fields are sent as numbers instead of decimal strings.
* `success_url` or `cancel_url` is missing or invalid.
* Authentication failed before the checkout request was processed.

## Check this in Kyren

* Confirm the product is active in **Dashboard > Products**.
* Check the product price and currency in the dashboard.
* Confirm your checkout settings use valid return URLs.
* Review Developer settings if the API response indicates authentication failure.

## Check this in your server

* Send amount and price values as decimal strings, such as `"9.99"`.
* Use a supported three-letter currency code such as `USD`.
* Confirm `success_url` and `cancel_url` are absolute HTTPS URLs.
* Log the request body and Kyren response status, excluding secrets.

## Fix

Update the request to use an active product, a supported currency, decimal string amounts, valid redirect URLs, and a valid `x-api-key`.

## Contact support if unresolved

Contact Kyren support with the request time, product ID, currency, response status, and error message. Do not send API keys.

## Related pages

* [Quickstart](/quickstart)
* [Dashboard checkouts](/dashboard/checkouts)
* [Create a checkout session API reference](/api-reference/checkouts/create-a-checkout-session)