---
title: "Billing fails but grace period is active."
method: POST
path: "subscription.past_due"
tags: ["subscription.* events"]
---

# Billing fails but grace period is active.

`POST subscription.past_due` (webhook)

### When this fires

A scheduled charge fails but the subscription remains within its grace window. The platform will continue to attempt collection.

Coverage is partial: only **Stripe** and **Razorpay** report the past-due transition back to Subscriby. Failed renewals on PayPal, Paystack, Skrill, CeyPay, and CoinPayments emit `payment.failed` without a matching `subscription.past_due`, so treat `payment.failed` as the reliable cross-provider signal.

### Caveats

- Pairs with a `payment.failed` event for the underlying charge.
- If retries succeed, `subscription.renewed` follows. If grace expires, `subscription.unpaid` fires instead.

### Related events

- `payment.failed`: paired payment event.
- `subscription.unpaid`: grace-window terminal state.

## Headers

- `SB-Signature` string, required
- `SB-Event-Id` string, required
- `SB-Event-Name` string, required
- `Content-Type` string, required
- `User-Agent` string, required

## Payload

- object: The envelope every event is delivered in.
  - `id` string, required: A ULID unique to the event, prefixed `evt_`. Every retry carries the same id, so it is the key to deduplicate on.
  - `type` 'subscription.past_due', required: The event name, always `subscription.past_due` here.
  - `created_at` string, date-time, required: When the event was emitted, server time, ISO 8601.
  - `api_version` string, required: The contract version of the payload shape, `2026-05-01` today. A breaking change to a shape ships under a new version.
  - `project_id` string, uuid, nullable, required: The project the event belongs to; null for team-scoped and billing events.
  - `data` object, required: The event-specific payload. Keys that do not apply to a given emission are omitted rather than sent as null, so check for presence.
    - `subscription_id` string, uuid, required: Subscription identifier.
    - `plan_id` string, uuid, required: Plan the subscription is on.
    - `subscriber_id` string, uuid, required: Subscriber's project-scoped user id.
    - `provider` string, required: Payment provider slug.
    - `external_payment_id` string: Razorpay path only; absent on the Stripe path. Provider charge id for the failed attempt; useful for support escalation.

## Acknowledgement `2XX`

Your endpoint acknowledged the delivery. Any 2xx status within 30 seconds marks it delivered; the response body is ignored.

## Other responses

- `default`: Any other status, a connection failure, or no answer within 30 seconds counts as a failed attempt. The delivery is retried 8 times, after 10 seconds, 30 seconds, 2 minutes, 10 minutes, 1 hour, 6 hours, 1 day, 3 days; the last failure dead-letters it, and it can be retried from the dashboard or `POST /v1/webhook-deliveries/{delivery}/retry`. After 20 consecutive failures the endpoint is paused until it is resumed.

---

[API](https://skmtc.dev/memberpass/apis/subscriby-rest-api.md) · [All operations](https://skmtc.dev/memberpass/apis/subscriby-rest-api/llms.txt) · [OpenAPI document](https://skmtc.dev/memberpass/apis/subscriby-rest-api/revisions/59c4df91d764?raw)