curl --request POST \
  --url https://api.withflex.com/v1/payment_intents/{id}/cancel \
  --header 'Authorization: Bearer <token>'

{
  "payment_intent": {
    "payment_intent_id": "obj_01EXAMPLE00000000000000000",
    "amount": 0,
    "amount_capturable": 0,
    "amount_received": 0,
    "application_fee_amount": 0,
    "customer": "string",
    "transfer_data": {
      "amount": 0,
      "destination": "string"
    },
    "status": "canceled",
    "latest_charge": "string",
    "created_at": "2024-01-01T00:00:00Z",
    "invoice": "string",
    "capture_method": "automatic",
    "client_secret": "string",
    "metadata": {},
    "payment_method": "string",
    "test_mode": false,
    "transfer_group": "string",
    "payment_card_type": "primary",
    "letter_fee_amount": 0,
    "transaction_fee": 0,
    "last_payment_error": {
      "type": "string",
      "code": "string",
      "decline_code": "string",
      "message": "string",
      "payment_method": "string"
    }
  }
}