curl --request POST \
  --url https://api.ai2fin.com/api/bank/upload \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form 'categoryMappings=<string>' \
  --form file=@example-file

{
  "transactionsImported": 123,
  "duplicatesSkipped": 123,
  "errors": [
    "<string>"
  ]
}