Track a withdrawal

Use webhooks for prompt notification and GET /withdrawals/{withdrawalId} for authoritative current state.

Processing pattern

1. Verify and deduplicate the event.
2. Persist the notification and acknowledge it promptly.
3. Fetch the withdrawal using its withdrawalId.
4. Update your workflow from the current resource.
5. Preserve reasonCode, transactionHash, payment code, and other outcome details needed for support and reconciliation.

Do not infer completion from successful withdrawal creation. Continue until the current resource reaches a terminal outcome supported by your workflow.