curl --request POST \
  --url https://api.decisionly.com/v2/issuer/files \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: multipart/form-data' \
  --form file='@example-file' \
  --form category=transaction_receipt

{
  "id": "<string>",
  "created": "2023-11-07T05:31:56Z",
  "type": "<string>",
  "category": "transaction_receipt"
}