curl --request POST \
  --url https://{tenant}/api/certs \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form 'file=<string>' \
  --form file.0='@example-file' \
  --form file.1='@example-file'

{
  "id": "5e9d9544a1dcd60001d0ed208edce514c2d0a866063550c64d6c90be99d01561ac5aa7e82b8610b7e273d37d",
  "message": "Certificate added.",
  "status": "ok"
}