---
id: ADR-MBR-MEM-005
title: Give Commerce the Coverage Plan
product_area: membership
module: memberships
revision: 1
status: proposed
design_intent: proposed
source_sha:
  services-membership: 5994c270e8a37a30f848e99ba5b5ee6b87c08893
  react-console: baf6dae382d6f41dce976c7f848667ccc37e076f
decision: >-
  Membership prepares coverage and pricing context without amounts; Commerce
  prices, places and collects, with Membership callers delegating ordering
  through its port.
constrains:
  - SVC-MBR-MEM-commerce-participant
  - WF-MBR-MEM-011
  - WF-MBR-MEM-021
  - WF-MBR-MEM-018
origin: >-
  D-1 of 2026-10-18 (packages and chapter dues are Accounting products) and D-5
  (the pricing audience), recorded in the participant manifest and pricing
  policy
alternatives:
  - option: Let Membership price its own products
    why_not: >-
      Independent Membership pricing would duplicate Accounting product-price
      ownership.
  - option: Let Commerce decide eligibility
    why_not: >-
      Commerce cannot independently apply Membership grace, continuity and
      chapter eligibility rules.
consequences:
  - >-
    Officer ordering, decision ordering and renewal billing reuse participant
    preparation.
  - >-
    An incompatible requested operation is refused rather than silently
    replaced.
  - Domain preparation can be exercised without performing a monetary order.
supersedes: []
evidence:
  - >-
    services-membership at 5994c270:
    modules/commerce-participant/services/prepare/*.ts;
    contracts/participant-manifest.ts; docs/migrations/participant/README.md
---

# Give Commerce the Coverage Plan

## Context

Checkout needs both a domain eligibility answer and a monetary purchase lifecycle. Membership and Commerce provide those different responsibilities.

## Decision

Membership prepares coverage and pricing context without amounts; Commerce prices, places and collects, with Membership callers delegating ordering through its port.

## Alternatives Considered

Let Membership price its own products: Independent Membership pricing would duplicate Accounting product-price ownership.

Let Commerce decide eligibility: Commerce cannot independently apply Membership grace, continuity and chapter eligibility rules.

## Consequences

Officer ordering, decision ordering and renewal billing reuse participant preparation. An incompatible requested operation is refused rather than silently replaced. Domain preparation can be exercised without performing a monetary order.