Payloads

Each Flo webhook message contains one normalized Flo event payload.

For concrete examples of delivered events, see Events.

Common Fields

{
  "eventId": "9f6f8b54-8e2d-4f15-8c8a-d7b6d9f41a00",
  "eventVersion": "v1",
  "objectType": "subscription",
  "eventType": "subscription.created",
  "user": {
    "id": "3b4d9a11-0ce8-4a88-9cb1-b4f43d03d2b7",
    "clientUserId": "user_123",
    "email": "user@example.com"
  },
  "subscription": {
    "uuid": "d8a2ad28-b98f-4cb6-bf46-f11cc0f5df16",
    "id": "plan_pro",
    "name": "Pro",
    "description": "Pro subscription",
    "startDate": "2026-04-10T00:00:00.000Z",
    "endDate": "2026-05-10T00:00:00.000Z",
    "state": "active",
    "quantity": 1,
    "currency": "USD",
    "amount": 29,
    "total": 29,
    "cancelAt": null,
    "canceledAt": null,
    "trialEnd": null,
    "pausedAt": null,
    "resumeAt": null,
    "metadata": null,
    "invoiceDetails": null
  }
}

Event Envelope

eventId: The Flo webhook delivery identifier for this endpoint delivery. It is not the upstream gateway event id, and automatic retries for the same delivery reuse the same eventId.
eventVersion: The webhook schema version.
objectType: The top-level Flo resource family for the event.
eventType: The normalized Flo event type.
user: The canonical user object for the event.
subscription: Present on subscription events. May also be present on invoice events as related enrichment.
item: Present on item events. May also be present on invoice events as related enrichment.
invoice: Present on invoice events.

New integrations should build against user, eventType, objectType, and the explicit resource root (subscription, item, or invoice). On invoice events, root-level subscription and item are enrichment fields. Flo includes them when the invoice points at a linked local transaction that resolves to a checkout subscription and/or checkout item.

User Object

{
  "id": "3b4d9a11-0ce8-4a88-9cb1-b4f43d03d2b7",
  "clientUserId": "user_123",
  "email": "user@example.com"
}

Subscription Payload

uuid: Flo's checkout subscription UUID when the event is linked to a checkout session.
id: The checkout subscription's provider plan id.
name / description: The checkout subscription's provider-backed display fields.

{
  "uuid": "d8a2ad28-b98f-4cb6-bf46-f11cc0f5df16",
  "id": "plan_pro",
  "name": "Pro",
  "description": "Pro subscription",
  "startDate": "2026-04-10T00:00:00.000Z",
  "endDate": "2026-05-10T00:00:00.000Z",
  "state": "active",
  "quantity": 1,
  "currency": "USD",
  "amount": 29,
  "total": 29,
  "cancelAt": null,
  "canceledAt": null,
  "trialEnd": null,
  "pausedAt": null,
  "resumeAt": null,
  "metadata": null,
  "invoiceDetails": null
}

Item Payload

uuid: Flo's checkout item UUID when the event is linked to a checkout session.
id: The checkout item's provider item id.
name / description: The checkout item's provider-backed display fields.

{
  "uuid": "da634f98-8748-4e90-bb5d-f3df74003b57",
  "id": "item_123",
  "name": "Product",
  "description": "Product description",
  "quantity": 1,
  "currency": "USD",
  "amount": 29,
  "total": 29,
  "invoiceState": "paid",
  "metadata": null,
  "invoiceDetails": null
}

Invoice Payload

{
  "id": "7bb5ce14-59e0-41ee-8fb7-84d6967cdb68",
  "invoiceNumber": "FLO-1001",
  "state": "pastDue",
  "billingReason": "subscription_cycle",
  "currency": "GBP",
  "amountDue": 27,
  "amountPaid": 0,
  "subtotal": 27,
  "total": 27,
  "paidAt": null,
  "hostedInvoiceUrl": "https://example.com/invoice",
  "invoicePdfUrl": "https://example.com/invoice.pdf",
  "invoiceDetails": null
}

Invoice Event Enrichment

On invoice events, Flo may include root-level subscription and/or item alongside invoice.
These related objects are resolved from the linked local transaction.
An invoice event can include either, both, or neither of these related objects.

{
  "eventId": "9f6f8b54-8e2d-4f15-8c8a-d7b6d9f41a00",
  "eventVersion": "v1",
  "objectType": "invoice",
  "eventType": "invoice.paid",
  "user": {
    "id": "3b4d9a11-0ce8-4a88-9cb1-b4f43d03d2b7",
    "clientUserId": "user_123",
    "email": "user@example.com"
  },
  "invoice": {
    "id": "7bb5ce14-59e0-41ee-8fb7-84d6967cdb68",
    "invoiceNumber": "FLO-1001",
    "state": "paid",
    "billingReason": "subscription_cycle",
    "currency": "GBP",
    "amountDue": 27,
    "amountPaid": 27,
    "subtotal": 27,
    "total": 27,
    "paidAt": "2026-04-11T10:20:00.000Z",
    "hostedInvoiceUrl": "https://example.com/invoice",
    "invoicePdfUrl": "https://example.com/invoice.pdf",
    "invoiceDetails": {
      "gatewayEventType": "invoice.paid",
      "invoiceId": "in_123",
      "invoiceStatus": "paid",
      "billingReason": "subscription_cycle",
      "transactionId": "pi_123",
      "currency": "GBP",
      "amountDue": 27,
      "amountPaid": 27,
      "total": 27
    }
  },
  "subscription": {
    "uuid": "d8a2ad28-b98f-4cb6-bf46-f11cc0f5df16",
    "id": "hub-membership",
    "name": "Hub Membership",
    "description": "Hub membership billed every four weeks",
    "quantity": 1,
    "currency": "GBP",
    "amount": 22,
    "total": 22,
    "metadata": {
      "source": "checkout-subscription"
    }
  },
  "item": {
    "uuid": "da634f98-8748-4e90-bb5d-f3df74003b57",
    "id": "priority-support",
    "name": "Priority Support",
    "description": "Priority support add-on",
    "quantity": 1,
    "currency": "GBP",
    "amount": 5,
    "total": 5,
    "metadata": {
      "source": "checkout-item"
    }
  }
}

{
  "uuid": "d8a2ad28-b98f-4cb6-bf46-f11cc0f5df16",
  "id": "hub-membership",
  "name": "Hub Membership",
  "description": "Hub membership billed every four weeks",
  "quantity": 1,
  "currency": "GBP",
  "amount": 22,
  "total": 22,
  "metadata": {
    "source": "checkout-subscription"
  }
}

{
  "uuid": "da634f98-8748-4e90-bb5d-f3df74003b57",
  "id": "priority-support",
  "name": "Priority Support",
  "description": "Priority support add-on",
  "quantity": 1,
  "currency": "GBP",
  "amount": 5,
  "total": 5,
  "metadata": {
    "source": "checkout-item"
  }
}

Invoice Details

invoiceDetails is optional on subscription, item, and invoice events. When present, it includes invoice and payment context associated with the Flo event.

Most integrations should build against eventType, objectType, and the explicit resource root (subscription, item, or invoice). invoiceDetails.gatewayEventType is additional trace context and should not be the primary switch for business logic.

{
  "gatewayEventType": "invoice.paid",
  "invoiceId": "in_123",
  "invoiceNumber": "FLO-1001",
  "invoiceStatus": "paid",
  "billingReason": "subscription_cycle",
  "invoicePaymentId": "inpay_123",
  "transactionId": "pi_123",
  "transactionType": "payment_intent",
  "paymentIntentId": "pi_123",
  "chargeId": "ch_123",
  "paymentRecordId": null,
  "receiptNumber": null,
  "hostedInvoiceUrl": "https://...",
  "invoicePdfUrl": "https://...",
  "paidAt": "2026-04-10T12:00:00.000Z",
  "currency": "USD",
  "amountDue": 29,
  "amountPaid": 29,
  "subtotal": 29,
  "total": 29
}

Payloads

Payloads

Common Fields

Event Envelope

Compatibility Fields

User Object

Subscription Payload

Item Payload

Invoice Payload

Invoice Event Enrichment

Invoice Details

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