chore: streamline quickstart webhook guidance

[MantisClone]

Problem

Quickstart repeats a long webhook walkthrough and an obsolete event catalog. That material can drift from the canonical webhook reference.

REQ-420

Proposed Solution

Keep Step 4 focused on the platform's first need: register a Client ID webhook to receive payment.confirmed. Link to the Webhooks reference for endpoint setup, recipient routing, payloads, and signature verification.

Considerations

• This stacks on #133 and depends on the canonical Webhooks reference introduced below it in #130.
• It changes only Quickstart's webhook step. Other steps, navigation, and docs remain unchanged.

UAT

1. Open the Quickstart preview.
2. Confirm Step 4 states that a Client ID webhook receives payment.confirmed when a payment completes and links to the Webhooks reference.
3. Confirm the step no longer contains endpoint instructions, payload examples, signature code, retry guidance, or an event catalog.

[MantisClone]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• chore: streamline quickstart webhook guidance #134 👈 (View in Graphite)
• chore: streamline webhook reconciliation guide #133
• chore: document current webhook delivery #132
• chore: consolidate webhook guidance #130
• fix: remove unused webhook event variants #129
• chore: add webhook payload examples #131
• main

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[greptile-apps]

Greptile Summary

The PR streamlines the Quickstart’s webhook step by replacing duplicated setup details with a link to the canonical Webhooks reference.

• Keeps Step 4 focused on registering a Client ID webhook for payment.confirmed.
• Delegates endpoint setup, recipient routing, payload, and signature-verification details to the Webhooks reference.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
use-cases/quickstart.mdx	Replaces the extended webhook walkthrough and event catalog with concise guidance linking to the complete, valid canonical reference.

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