feat(stripe): webhook endpoint and one-off reconciliation

[Tarunkumar0601]

Adds a signed Stripe webhook endpoint as the authoritative backstop for reconciling payments server-to-server.

• Signature-verified endpoint (checks every configured account's secret → multi-account)
• Stripe Webhook Log doctype: audit trail + idempotency ledger (unique stripe_event_id)
• Event router (stripe_reconcile.py) with idempotent handlers
• One-off reconciliation on payment_intent.succeeded (reuses the shared finaliser)
• Always returns 200 once logged, so a business failure doesn't trigger endless retries

Ensures payments reconcile even if the customer never returns to the site. Depends on feat/stripe-customers-saved-cards.

Backport Needed: V15 & V16

[mergify]

Tick the box to add this pull request to the merge queue (same as @mergifyio queue).

• Queue this pull request

[greptile-apps]

Confidence Score: 3/5

The Hosted Checkout path creates unbounded orphaned Integration Requests on retries, and the ERPNext settlement import is unguarded against version drift.

Two incomplete fixes in the new code: the orphan-IR problem was solved for embedded checkout but not for the new hosted checkout flow, and the get_existing_payment_entry import has no version guard. Both affect the core payment reconciliation path.

stripe_settings.py (create_checkout_session) and settle_payment_request.

_{Reviews (28): Last reviewed commit: "feat(stripe): webhook endpoint and one-o..." | Re-trigger Greptile}

[sudarsan2001]

still this is not resolved.
use PHRASES = {"Day": _("daily"), "Week": _("weekly"), "Month": _("monthly"), "Year": _("yearly")}
recurrence = PHRASES.get(billing_interval, "") if billing_interval_count == 1
else _("every {0} {1}").format(billing_interval_count, {"Day": _("days"), ...}.get(billing_interval, ""))