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Stripe webhooks and access control

Day 25 of 30 · Generative AI 2026: Build AI Apps and Agents

One-liner: Grant access when payment succeeds and revoke when it does not.
Time: 20 to 30 min
Deliverable: Webhook Handler and Access Gate

Learning goal

You will be able to: Handle Stripe webhooks and gate paid features.

Success criteria (observable)

  • Webhook handler validates the event signature.
  • Paid users are granted access.
  • Failed payments do not grant access.

Output you will produce

  • Deliverable: Webhook Handler and Access Gate
  • Format: Code snippet plus test log
  • Where saved: Repo and course folder notes

Who

Primary persona: Digital nomad adding payment gating Secondary persona(s): Paying users who expect access Stakeholders (optional): Collaborators

What

What it is

A webhook endpoint that listens for payment events and updates access. It ensures only paid users can use paid features.

What it is not

It is not a full billing portal or complex subscription management. It is a clean access gate for the first paid plan.

2-minute theory

  • Payments and access must be linked to prevent leaks.
  • Webhooks are the source of truth for payment events.
  • Signature checks prevent spoofed events.

Key terms

  • Webhook: A server endpoint that receives Stripe events.
  • Access gate: Logic that allows paid features only for eligible users.

Where

Applies in

  • Backend webhooks
  • Access checks

Does not apply in

  • Marketing content

Touchpoints

  • Webhook endpoint
  • User access flags
  • Payment logs

When

Use it when

  • You add paid access
  • You need to grant or revoke features

Frequency

Once per product, update with pricing changes

Late signals

  • Users report paying but no access
  • Free users access paid features

Why it matters

Practical benefits

  • Reliable paid access
  • Fewer support tickets
  • Clear payment status

Risks of ignoring

  • Revenue loss
  • User distrust

Expectations

  • Improves: payment reliability
  • Does not guarantee: no billing edge cases

How

Step-by-step method

  1. Create a webhook endpoint on the server.
  2. Validate the Stripe signature.
  3. Handle payment success and failure events.
  4. Update user access status.

Do and don't

Do

  • Validate signatures on every webhook
  • Log webhook events

Don't

  • Trust client side payment status
  • Grant access without verification

Common mistakes and fixes

  • Mistake: No signature check. Fix: Validate signature.
  • Mistake: Access updated on client. Fix: Update on server.

Done when

  • Webhook verifies signatures.
  • Access is granted on payment success.
  • Access is denied on failure.

Guided exercise (10 to 15 min)

Inputs

  • Stripe webhook secret
  • Payment success event

Steps

  1. Create the webhook handler.
  2. Verify signature.
  3. Update access and log result.

Output format

Field Value
Webhook endpoint
Signature check
Access update
Test result

Pro tip: Use Stripe CLI to trigger test events.

Independent exercise (5 to 10 min)

Task

Add handling for a payment failure event.

Output

Updated webhook logic.

Self-check (yes/no)

  • Are webhook signatures verified?
  • Is access granted only on success?
  • Are failures handled?
  • Are events logged?

Baseline metric (recommended)

  • Score: 1 successful test event handled
  • Date: 2026-02-06
  • Tool used: Stripe CLI

Bibliography (sources used)

  1. Stripe Webhooks Docs. Stripe. 2024-01-01. Read: https://stripe.com/docs/webhooks

  2. Stripe CLI. Stripe. 2024-01-01. Read: https://stripe.com/docs/stripe-cli

Read more (optional)

  1. Webhook Security Why: How to validate and secure webhooks. Read: https://stripe.com/docs/webhooks/signatures