1curl -X 'POST'2 'https://api.fileforge.com/pdf/merge/'3 -H 'accept: application/pdf'4 -H 'X-API-Key: '5 -H 'Content-Type: multipart/form-data'6 -F 'options={};type=application/json'7 -F 'files=@doc.pdf;type=application/pdf'8 -F 'files=@document (18).pdf;type=application/pdf'