Webhook signature verification in Rest API - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is webhook signature verification?

Webhook signature verification is a security method to confirm that a webhook request really comes from the expected sender by checking a special code called a signature.

beginner

Why do we verify webhook signatures?

We verify webhook signatures to protect our app from fake or harmful requests pretending to be from trusted sources.

intermediate

Which common method is used to create webhook signatures?

A common method is using HMAC (Hash-based Message Authentication Code) with a secret key shared between sender and receiver.

intermediate

What information do you usually need to verify a webhook signature?

You need the webhook payload (data sent), the secret key, and the signature sent with the webhook to compare and confirm authenticity.

beginner

What happens if webhook signature verification fails?

If verification fails, the webhook request should be rejected or ignored to keep your system safe from unauthorized actions.

What is the main purpose of webhook signature verification?

A To confirm the webhook is from a trusted sender

B To speed up webhook delivery

C To encrypt the webhook data

D To log webhook requests

Webhook signature verification confirms the webhook is from a trusted sender by checking the signature.

Which cryptographic method is commonly used for webhook signature verification?

A MD5 hashing without a key

B RSA encryption

C Base64 encoding

D HMAC

HMAC uses a secret key and hashing to create a secure signature for verification.

What should your app do if the webhook signature does not match?

A Process the webhook normally

B Reject or ignore the webhook request

C Send a thank you message

D Store the webhook for later

Rejecting or ignoring unverified webhooks protects your app from fake or harmful requests.

What two pieces of information are essential to verify a webhook signature?

A Payload and sender's email

B Sender's IP and timestamp

C Payload and secret key

D Secret key and sender's username

The payload and secret key are used to recreate and check the signature.

Where is the webhook signature usually sent?

A In the webhook request headers

B In the webhook URL

C In the webhook body as plain text

D In the webhook response

The signature is typically sent in the request headers for easy access and security.

Explain how webhook signature verification works step-by-step.

Think about how you check a secret code to trust a message.

Why is it important to keep the secret key safe in webhook signature verification?

Imagine the secret key as a password for trust.