[alx-xo]

Summary

• Revert feat: migrate hosted checkout to embedded form #7459 (9b80ab1) and restore hosted Stripe checkout.
• Remove the embedded form and its new publishable-key requirement, preserving subsequent changes.
• Follow up on the production image rollback in speakeasy-api/gram-infra#4796 so subsequent releases do not reintroduce the regression.

Motivation

The embedded checkout migration requires STRIPE_PUBLISHABLE_KEY, but the deployment configuration did not wire it into the server. Restore the previous checkout flow while the configuration and rollout are addressed.

Validation

• Verified the staged diff exactly matched the inverse of feat: migrate hosted checkout to embedded form #7459.
• mise run test:server ./internal/thirdparty/stripe/: 129 tests passed.
• Diff and pre-commit checks passed. No database migrations changed.
• End-to-end checkout has not yet been verified.

Gutternote review steps

1. Use a sandbox organization with self-serve billing enabled, no active subscription, and an org-admin session.
2. Open Billing and start checkout.
3. Verify checkout redirects to Stripe-hosted Checkout rather than mounting an embedded form.
4. Complete checkout using sandbox payment details and verify the dashboard reflects the subscription after webhook processing.

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Summary by cubic

Reverts the embedded Stripe checkout migration from #7459 and restores the hosted flow, since deployment configuration never wired the required STRIPE_PUBLISHABLE_KEY.

Rollback details

• Checkout redirects to Stripe-hosted Checkout again instead of mounting an inline form.
• Removes the STRIPE_PUBLISHABLE_KEY requirement, the checkout status polling endpoint, and the embedded checkout UI.
• Complete the production image rollback in speakeasy-api/gram-infra#4796 before future releases to avoid reintroducing this regression.

^{Written for commit 07984dc. Summary will update on new commits.}

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🚀 Preview Environment (PR #8257)

Preview URL: https://pr-8257.dev.getgram.ai

Component	Status	Details	Updated (UTC)
✅ Database	Ready	Created and validated	2026-10-29 01:23:23.
✅ Images	Available	Container images ready	2026-10-29 01:25:00.

_{Gram Preview Bot}

[changeset-bot]

⚠️ No Changeset found

Latest commit: 07984dc

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[gram-bot]

Auto-approved: review:bypass label applied by @alx-xo. Required status checks still gate this merge.

[cubic-dev-ai]

All reported issues were addressed across 99 files

<sub>This PR changes payment, billing, or quota logic. Ultrareviews find 2.4x more serious bugs than standard reviews. Comment @cubic-dev-ai ultrareview to run one.

View guided diff | Turn on auto-fix | Re-trigger cubic</sub>