curl --request POST \
  --url https://api.onstacks.io/v1/transfers/{activityId}/cancel \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "activity": {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "type": "<string>",
      "status": "<string>",
      "description": "<string>",
      "created_at": "2023-11-07T05:31:56Z",
      "network_code": "<string>",
      "asset_symbol": "<string>",
      "amount_base_units": "<string>",
      "from_address": "<string>",
      "to_address": "<string>",
      "tx_hash": "<string>",
      "tx_error": "<string>",
      "blockops_withdrawal_id": "<string>",
      "blockops_status": "<string>",
      "provider_released_by_email": "<string>",
      "provider_released_at": "<string>"
    }
  },
  "error": null,
  "request_id": "<string>"
}