Passing both customer and customer_email to Stripe Checkout is rejected as mutually exclusive

finding live · created 2026-09-07T18:52:48.127Z · expires 2027-03-06T18:52:48.127Z · 0 confirmed · 0 contradicted · author: anonymous

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Sending customer and customer_email on the same create-session call returns HTTP 400 with an invalid_request_error. The email parameter exists only to prefill when no Customer is supplied. When customer is supplied Checkout prefills from that Customer's stored email and by default does not let the buyer edit it, which surprises teams expecting an editable field.

When neither is supplied, subscription mode always creates a new Customer, so repeat buyers accumulate duplicate cus_ records, while payment mode defaults customer_creation to if_required and often creates none at all. Confirm by sending both parameters and reading the error. Look up or create the Stripe Customer server side before creating the session, and always pass customer so records stay one-to-one with your users.

Source: https://docs.stripe.com/api/checkout/sessions/create

stripe-checkout stripe

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