P0 Stripe surface to 100% + coverage baselines + public polish - #77
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Re-measured the OpenAPI inventory against the pinned 2026-04-22.dahlia snapshot (stripe/openapi v2261): 175/587 operations, 29.8% L1+. Updates README, the 90% target family table, tracking docs, and gate evidence; documents the tax-rate/tax-ID and invoice-depth surface in COMPATIBILITY.md; and corrects stale subscription-item ID risk text in the claim registry.
…ed discount routes Adds billing portal configuration CRUD as local evidence (first configuration becomes the run default), subscription item list/retrieve and update (price/quantity with the shared proration path), and customer-scoped nested subscription discount retrieve/delete. Claims the already-tested invoice void, invoice mark_uncollectible, and checkout expire routes, retiring the implementedWithoutCompatClaim fallback carve-out. Fixes subscription discount deletion: the delete patch removed discount metadata keys, but subscription metadata patches merge, so the discount survived its own deletion. OpenAPI inventory: 175/587 (29.8%) -> 187/587 (31.9%); billing_portal closes to 5/5, billing 31/39, checkout 4/6.
…, product delete
GET /v1/checkout/sessions/{id}/line_items returns expanded Stripe item
objects, and POST /v1/checkout/sessions/{id} updates open sessions
(metadata merge plus line_items[N][quantity] overrides, prices immutable).
Checkout closes to 6/6 OpenAPI operations.
Draft invoices gain POST /v1/invoices/{id} (description, days_until_due,
default_payment_method, metadata), DELETE /v1/invoices/{id} (removes
attached lines and timeline evidence), and add_lines/update_lines/
remove_lines through the invoice-item path with subtotal/total/amount_due
recomputation. DELETE /v1/products/{id} removes local product evidence;
prices keep referencing the deleted id.
Repository gains DeleteInvoice, UpdateInvoiceItem, DeleteInvoiceItem, and
DeleteProduct; UpdateCheckoutSession now persists line_items so quantity
overrides survive reloads.
OpenAPI inventory: 187/587 (31.9%) -> 195/587 (33.2%); billing 36/39,
catalog 28/54.
POST /v1/invoices/{id}/lines/{line_item_id} updates one draft line
(amount/description/metadata) with the update_lines totals recomputation;
attach_payment records a customer-matched PaymentIntent or payment record
on a draft invoice as evidence while collection still runs through
finalize/pay; POST /v1/subscriptions/{id}/migrate records
billing_mode=flexible as subscription metadata evidence.
POST /v1/payment_intents/{id} merges metadata and an evidenced
description (amount/currency/status immutable), and
GET /v1/credit_notes/{id}/lines returns one line derived from the stored
note amount and memo/reason.
OpenAPI inventory: 195/587 (33.2%) -> 200/587 (34.1%). Billing closes
to 39/39, so all four P0 families (webhooks, checkout, billing,
billing_portal) are now at 100%.
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Summary
Verification
go test ./...passes (full suite, three consecutive runs)go run ./cmd/billtap compatibility scorecard→imported=50 skipped=1 unsupported=1 mismatch=0 error=0go run ./cmd/billtap compatibility inventory --openapi <dahlia spec>→operations=587 implemented=200 inventory_only=387 implemented_percent=34.1gofmt -l .clean; registry claim-count guard updated to 206Family deltas (generated inventory)
Open risks
POST /v1/subscriptions/{id}/migrate) and invoiceattach_paymentare evidence-level (metadata) implementations; risks documented in claims and COMPATIBILITY.md.Gate status
G13/G14 in progress; no gate regressions — evidence in docs/GATE_STATUS.md re-measured on 2026-08-29.