const form = new FormData();
form.append('template_id', '<string>');
form.append('upload_file', '<string>');
form.append('numeric_locale', '<string>');
form.append('project_id', '3c90c3cc-0d44-4b50-8888-8dd25736052a');
form.append('folder_id', '3c90c3cc-0d44-4b50-8888-8dd25736052a');
form.append('raw_file_id', '3c90c3cc-0d44-4b50-8888-8dd25736052a');

const options = {
  method: 'POST',
  headers: {'x-organization-id': '<x-organization-id>', 'x-api-key': '<api-key>'}
};

options.body = form;

fetch('https://api.dcycle.io/v2/imports/sessions', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "import_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "file_name": "<string>",
  "total_rows": 123,
  "detected_header_row": 123,
  "source_columns": [
    "<string>"
  ],
  "sample_rows": [
    [
      "<unknown>"
    ]
  ],
  "numeric_locale": "<string>",
  "sheets": [
    "<string>"
  ],
  "selected_sheet": "<string>"
}