Lemon Squeezy createCheckout 500s without an email in checkoutData
If Lemon Squeezy's createCheckout gives you a 500 or an invalid-signature page, include the buyer's email in checkoutData. Checkouts created without an email failed server-side in this report, and adding it made creation succeed immediately. Pass checkoutData.email on every programmatic checkout even when you think the field is optional.
Context: GitHub issue lmsqueezy/lemonsqueezy.js#87: Creating a checkout through the SDK returned "Invalid signature" on the checkout page and, in another attempt, a bare 500 error. The reporter found the 500 went away as soon as an email was included in checkoutData; without it the checkout could not be created. The maintainer confirmed platform changes were made to address this class of failure.Maintainer review
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This records the version a maintainer checked. It does not assert that the version is the latest upstream release.
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