Emma/stripe secure

[e-wai]

Notion ticket link

Ticket Name

Implementation description

• Heavily inspired by https://github.com/stripe/stripe-node/blob/master/examples/webhook-signing/typescript-node-express/express-ts.ts
• Docs from Stripe:
  • https://stripe.com/docs/webhooks/quickstart
  • https://stripe.com/docs/webhooks/signatures

Steps to test

What should reviewers focus on?

Checklist

• My PR name is descriptive and in imperative tense
• My commit messages are descriptive and in imperative tense. My commits are atomic and trivial commits are squashed or fixup'd into non-trivial commits
• I have run the appropriate linter(s)
• I have requested a review from the PL, as well as other devs who have background knowledge on this PR or who will be building on top of this PR

[github-actions]

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