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This is a list of all the event types Flex currently sends. We may add more types at any time, so when developing and maintaining your code, you should not assume this list is exhaustive. All events follow the pattern of 
{
    event_dt: integer,
    event_id: string,
    event_type: string,
    object: object
}
where object is the object that was created, updated, deleted, etc.

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Charge dispute events


charge.dispute.closed where object is the dispute object Occurs when a dispute is closed and the dispute status changes to won or lost.
charge.dispute.created where object is the dispute object Occurs whenever a customer disputes a charge with their bank (chargeback).
charge.dispute.funds_reinstated where object is the dispute object Occurs when funds are reinstated to your account after a dispute is closed. This includes partially refunded payments.
charge.dispute.funds_withdrawn where object is the dispute object Occurs when funds are removed from your account due to a dispute.
charge.dispute.updated where object is the dispute object Occurs when the dispute is updated (usually with evidence).

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Charge and refund events


charge.refund.updated where object is the refund object Occurs whenever a refund is updated, on selected payment methods.
charge.refunded where object is the charge object Occurs whenever a charge is refunded, on selected payment methods.

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Customer events

customer.created where object is the customer object Occurs whenever a new customer is created.
customer.deleted where object is the customer object Occurs whenever a customer is deleted.
customer.updated where object is the customer object Occurs whenever any property of a customer changes.

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Subscription events


customer.subscription.created where object is the subscription object Occurs whenever a customer is signed up for a new plan.
customer.subscription.updated where object is the subscription object Occurs whenever an existing subscription changes (e.g., plan changes, payment failure, cancellation, status transitions like active → past_due). Not fired at subscription creation, and not reliably fired on trialing → active transitions. To detect new subscriptions, listen to customer.subscription.created (gated on status in (trialing, active)) or invoice.payment_succeeded.
customer.subscription.deleted where object is the subscription object Occurs whenever a customer’s subscription ends.

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Invoice events


invoice.created where object is the invoice object Occurs whenever a new invoice is created.
invoice.finalized where object is the invoice object Occurs whenever an invoice transitions from draft to open and is ready for payment.
invoice.paid where object is the invoice object Occurs whenever an invoice is paid in full. Fires alongside invoice.payment_succeeded for paid invoices.
invoice.payment_failed where object is the invoice object Occurs whenever an invoice payment attempt fails (e.g., declined card, insufficient funds). For subscriptions, this is typically followed by a customer.subscription.updated event transitioning the subscription to past_due.
invoice.payment_succeeded where object is the invoice object Occurs whenever an invoice payment attempt succeeds. For subscriptions, this is the most reliable signal that a customer has paid — recommended for provisioning or extending entitlements.

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Payment intent events


payment_intent.created where object is the payment intent object Occurs whenever a new PaymentIntent is created.
payment_intent.succeeded where object is the payment intent object Occurs whenever a PaymentIntent has succeeded.

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Refund events


refund.created where object is the refund object Occurs whenever a refund is created, on selected payment methods.
refund.updated where object is the refund object Occurs whenever a refund is updated, on selected payment methods.