# Tasks: slim-payment-providers

## 1. Remove concrete provider modules

- [ ] 1.1 Delete `packages/universal/payment-providers/src/providers/stripe/`.
- [ ] 1.2 Delete `packages/universal/payment-providers/src/providers/paypal/`.
- [ ] 1.3 Delete `packages/universal/payment-providers/src/providers/square/`.
- [ ] 1.4 Delete `packages/universal/payment-providers/src/providers/mollie/`.
- [ ] 1.5 Delete `packages/universal/payment-providers/src/providers/adyen/`.
- [ ] 1.6 Delete the now-empty `src/providers/` directory.
- [ ] 1.7 Drop the `SquareConfig` type from `src/types/provider.ts`
  (it ships with the sibling Square package).
- [ ] 1.8 Remove the 5 `./providers/<name>/<name>` entries from
  `package.json#exports`.

## 2. Extract composeAbortSignal as a public helper

- [ ] 2.1 Promote the internal `composeSignals` function in
  `src/http/http.ts` to an exported `composeAbortSignal(internal, external)`.
- [ ] 2.2 Re-export `composeAbortSignal` from `src/http/index.ts` and
  `src/index.ts`.
- [ ] 2.3 Extend `src/http/http.test.ts` to cover `composeAbortSignal`
  directly (internal abort propagates, external abort propagates,
  already-aborted external triggers immediately, undefined external
  returns internal).
- [ ] 2.4 Update `src/http/http.md` to document `composeAbortSignal`.

## 3. Add PROVIDER_NOT_REGISTERED + PROVIDER_ALREADY_REGISTERED codes

- [ ] 3.1 Extend the `PAYMENT_PROVIDER_CODES` registry in
  `src/error-codes/error-codes.ts` with `PROVIDER_NOT_REGISTERED` and
  `PROVIDER_ALREADY_REGISTERED`.
- [ ] 3.2 Add `providerNotRegistered(name)` and
  `providerAlreadyRegistered(name)` factories.
- [ ] 3.3 Extend `src/error-codes/error-codes.test.ts` to confirm both
  new codes are reachable from their factories and carry the `provider`
  discriminant when the registry surfaces them.
- [ ] 3.4 Update `src/error-codes/error-codes.md` to list all 6 codes.

## 4. Build ProviderRegistry

- [ ] 4.1 Create `src/registry/registry.ts` exporting a `ProviderRegistry`
  class with `register`, `unregister`, `get`, `has`, `list`, `size`.
- [ ] 4.2 `get(name)` MUST throw `PaymentProviderError(PROVIDER_NOT_REGISTERED)`
  on miss.
- [ ] 4.3 `register(provider)` MUST throw
  `PaymentProviderError(PROVIDER_ALREADY_REGISTERED)` when the name is
  already present.
- [ ] 4.4 `list()` MUST return a frozen array in insertion order.
- [ ] 4.5 Create `src/registry/registry.md` with the §4 mandatory
  sections (Purpose, Features, Basic + Advanced usage, API Reference,
  Implementation Notes).
- [ ] 4.6 Create `src/registry/registry.test.ts` covering every public
  method, both error paths, and the insertion-order guarantee.

## 5. Add definePaymentProvider factory

- [ ] 5.1 Create `src/registry/define.ts` exporting
  `definePaymentProvider<TName extends string>(spec)`.
- [ ] 5.2 Result MUST be frozen and MUST carry the literal `TName`.
- [ ] 5.3 Method identities MUST be preserved (the closure passed in
  IS the closure dispatched at call time).
- [ ] 5.4 Create `src/registry/define.md` with the §4 mandatory sections.
- [ ] 5.5 Create `src/registry/define.test.ts` covering the
  literal-type narrowing, frozen-shape guarantee, method-identity
  preservation, and the round-trip through `ProviderRegistry.register`.

## 6. Update barrels + subpath exports

- [ ] 6.1 Create `src/registry/index.ts` re-exporting `ProviderRegistry`
  and `definePaymentProvider` via explicit named exports (rule 6a).
- [ ] 6.2 Rewrite `src/index.ts` to drop the 5 provider class exports
  and the `SquareConfig` type export, and add `ProviderRegistry`,
  `definePaymentProvider`, `composeAbortSignal`, `providerNotRegistered`,
  `providerAlreadyRegistered`.
- [ ] 6.3 Add `./registry/registry` to `package.json#exports`. Final
  count: 5 entries (`.`, `./types/provider`, `./error-codes/error-codes`,
  `./http/http`, `./registry/registry`).
- [ ] 6.4 Update `package.json#description` to describe the slim core.

## 7. Update README.md

- [ ] 7.1 Rewrite the one-paragraph description to reflect the slim
  shape.
- [ ] 7.2 Rewrite the Quick Start example to use `ProviderRegistry` +
  a sibling-imported `StripeProvider`.
- [ ] 7.3 Rewrite the Features list to drop the 5-adapter language and
  describe the foundation surface.
- [ ] 7.4 Rewrite the Modules list — only `types/provider`,
  `error-codes/error-codes`, `http/http`, `registry/registry`.
- [ ] 7.5 Add a "Sibling provider packages" section linking the 5
  follow-up packages by name (note they are not yet published).

## 8. Verification gates (§13)

- [ ] 8.1 Step 0 — spec reconciliation: walk every `### Requirement`
  in the delta, grep `src/` for the named symbols, confirm every
  `**Verified by:**` test name appears in the matching test file.
- [ ] 8.2 Step 1 — `bunx turbo lint typecheck test --filter=@suaveplan/payment-providers`.
- [ ] 8.3 Step 2 — `bunx turbo test:coverage --filter=@suaveplan/payment-providers`
  reports 100/100/100/100.
- [ ] 8.4 Step 3 — `bunx turbo build --filter=@suaveplan/payment-providers`.
- [ ] 8.5 Step 4 — banned-pattern scan returns zero output.
- [ ] 8.6 Step 4a — barrel-shape scan returns zero output (no
  `export *` in any `<feature>/index.ts`).
- [ ] 8.7 Step 4b — test-runner import scan returns zero output (no
  direct `vitest` / `bun:test` imports).
- [ ] 8.8 Step 5 — every `.ts` (excl. `.test.ts`, `.types.ts`,
  `index.ts`) has a sibling `.md`.
- [ ] 8.9 Step 6 — `README.md` exists.
- [ ] 8.10 Step 7 — no bare versions in `package.json`.
- [ ] 8.11 Step 8 — subpath-export count matches the feature-module
  count (4 features + root = 5 entries).
- [ ] 8.12 Step 9 — security scan returns zero output.
- [ ] 8.13 Step 10 — dependent sweep:
  `bunx turbo test --filter=...@suaveplan/payment-providers` green
  (currently only the package itself).

## 9. Root-doc refresh (§13b)

- [ ] 9.1 Run `bun scripts/folder-reorg/generate-manifest.ts` to refresh
  `MANIFEST.md`.
- [ ] 9.2 Run `bun scripts/generate-missing.ts` to refresh `MISSING.yml`.
- [ ] 9.3 Hand-edit `STATUS.md` row for `@suaveplan/payment-providers`
  to describe the slim shape (no row flip — package stays ✅).
- [ ] 9.4 Hand-edit `SUMMARY.md` paragraph for
  `@suaveplan/payment-providers` to describe the slim shape.
- [ ] 9.5 `bunx markdownlint-cli2 --fix` across touched docs.

## 10. Fold + archive (§14)

- [ ] 10.1 Fold `specs/payment-providers/spec.md` into
  `openspec/specs/payment-providers/spec.md` — apply the `## REMOVED`
  block (delete the 5 provider requirements + drop `SquareConfig` from
  the http/types requirement) and apply the `## ADDED` block (add the
  `ProviderRegistry`, `definePaymentProvider`, `composeAbortSignal`, and
  registry-code requirements).
- [ ] 10.2 Move `openspec/changes/slim-payment-providers/` →
  `openspec/archive/2026-05-17-slim-payment-providers/`.