---
taskmaster_id: "4.6"
status: "done"
priority: "high"
depends_on: ["3"]
parent_id: "4"
source: "taskmaster"
generated_at: "2026-05-28T11:49:27.076Z"
---

# 4.6 - Specify webhook security and provider adapter contracts

- [x] 4.6 - Specify webhook security and provider adapter contracts #taskmaster #priority/high #status/done ⏫ 🆔 tm-4-6 ⛔ tm-3

## Metadata

| Field | Value |
| --- | --- |
| Taskmaster ID | 4.6 |
| Status | done |
| Priority | high |
| Dependencies | 3 |
| Parent | 4 - Define backend security and refactor strategy from latest audit |

## Description

Define provider-neutral payment interface and signed webhook processing rules.

## Details

Document createPayInIntent, getPayInStatus, handleProviderWebhook, createHostedPaymentLink, createReleaseInstruction, createRefundInstruction, getPayoutStatus, searchProviderPayments, raw-body signature verification, replay prevention, delivery ID idempotency, duplicate/unknown event behavior, retry semantics, dead-letter/replay storage, and alert thresholds.

## Verification

Contracts cover SHKeeper legacy, Request Network, manual/admin wallet, invalid signatures, duplicate deliveries, and missed webhook reconciliation.
