curl --request POST \
  --url https://api.fint.app/api/v1/webhook \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "url": "<string>",
  "events": [
    "payment.created"
  ],
  "externalReference": "<string>"
}
'

{
  "id": 123
}