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cfw-autumn/apps/docs/mintlify/api-reference/core/attach.mdx
2026-02-16 12:09:51 +00:00

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---
title: "Attach Product"
openapi: "coreapi POST /attach"
---
{/* If payment is required, a Stripe `checkout_url` will be returned. If the customer's card is already on file, any upgrade or downgrade logic will be handled by default, and a `success: true` response will be returned. */}
<Tip>
{" "}
If the `customer_id` you send doesn't already exist, Autumn will automatically
create a new customer. You can optionally set the properties of this new customer
through the `customer_data` field.
</Tip>