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Unfortunately it is not possible to link existing products on Stripe into the products on your form. You can only configure the product in the integration. If you want to check inventory, you can only do so by manually checking it on your Stripe account.
However, there is an option to fetch subscriptions from your Stripe Account, but this is only available when selling Subscriptions. It is not available for Product based payment.
When selling subscriptions, you can fetch the subscriptions by clicking the Additional Gateway Settings as seen below.
Then scroll to the bottom and set the "Fetch Subscriptions from Stripe Account" to Yes.