curl --location --request POST 'https://api.convert2pdfapi.com/v1/image/to-pdf' \
--header 'x-api-key: <api-key>' \
--form 'imageFiles=""' \
--form 'fileName="converted"' \
--form 'paperFormat="A4"' \
--form 'orientation="portrait"' \
--form 'fitToPage="true"' \
--form 'maintainAspectRatio="true"'{
"status": "error",
"message": "At least 1 image file is required"
}