Library not able to get address info for https://sandbox.monnify.com

Hello everyone,  I tried using this library but any request initiated with it to the host: https://sandbox.monnify.com always returns error with this response:
`{
  errno: -3008,
  code: 'ENOTFOUND',
  syscall: 'getaddrinfo',
  hostname: 'https://sandbox.monnify.com'
}
`
Despite having confirmed that the host is reachable via other means.