It is sent before a 3D Secure verification, so if the card requires 3D Secure, then the source is not yet really chargeable.
{
"api_version": "2017-08-15",
"created": 1510158187,
"data": {
"object": {
"amount": null,
"card": {
"address_line1_check": "unchecked",
"address_zip_check": "unchecked",
"brand": "Visa",
"country": "US",
"cvc_check": "unchecked",
"dynamic_last4": null,
"exp_month": 7,
"exp_year": 2021,
"fingerprint": "iE2bGIQEjqXgpZsy",
"funding": "credit",
"last4": "3063",
"three_d_secure": "required",
"tokenization_method": null
},
"client_secret": "src_client_secret_<id>",
"created": 1510158186,
"currency": null,
"flow": "none",
"id": "src_1BLwKUFzKb8aMux1tNS4N1ek",
"livemode": false,
"metadata": [],
"object": "source",
"owner": {
"address": {
"city": "Sydney",
"country": "AU",
"line1": "72 Liverpool St",
"line2": null,
"postal_code": "2000",
"state": null
},
"email": "dfediuk@gmail.com",
"name": "DMITRY FEDYUK",
"phone": "+61282688888",
"verified_address": null,
"verified_email": null,
"verified_name": null,
"verified_phone": null
},
"statement_descriptor": null,
"status": "chargeable",
"type": "card",
"usage": "reusable"
}
},
"id": "evt_1BLwKVFzKb8aMux1TeZOsKyM",
"livemode": false,
"object": "event",
"pending_webhooks": 1,
"request": {
"id": "req_sP6zXp1jwj73Rw",
"idempotency_key": null
},
"type": "source.chargeable"
}